diff --git a/en/application-dev/reference/apis/js-apis-call.md b/en/application-dev/reference/apis/js-apis-call.md
index cb8927953871984a8f7784697f61071d96715b94..dc54b14b351dc85a09abd394681bd1dd2d182568 100644
--- a/en/application-dev/reference/apis/js-apis-call.md
+++ b/en/application-dev/reference/apis/js-apis-call.md
@@ -17,7 +17,9 @@ dial\(phoneNumber: string, callback: AsyncCallback<boolean\>\): void
 
 Initiates a call. This function uses an asynchronous callback to return the execution result.
 
-Before using this API, you must declare the **ohos.permission.PLACE\_CALL** permission (a system permission).
+**Required permission**: ohos.permission.PLACE\_CALL (a system permission)
+
+**System capability**: SystemCapability.Telephony.CallManager
 
 **Parameters**
 
@@ -41,7 +43,9 @@ dial\(phoneNumber: string, options: DialOptions, callback: AsyncCallback<boolean
 
 Initiates a call. You can set call options as needed. This function uses an asynchronous callback to return the execution result.
 
-Before using this API, you must declare the **ohos.permission.PLACE\_CALL** permission (a system permission).
+**Required permission**: ohos.permission.PLACE\_CALL (a system permission)
+
+**System capability**: SystemCapability.Telephony.CallManager
 
 **Parameters**
 
@@ -68,7 +72,9 @@ dial\(phoneNumber: string, options?: DialOptions\): Promise<boolean\>
 
 Initiates a call. You can set call options as needed. This function uses a promise to return the execution result.
 
-Before using this API, you must declare the **ohos.permission.PLACE\_CALL** permission (a system permission).
+**Required permission**: ohos.permission.PLACE\_CALL (a system permission)
+
+**System capability**: SystemCapability.Telephony.CallManager
 
 **Parameters**
 
@@ -102,6 +108,8 @@ hasCall\(callback: AsyncCallback<boolean\>\): void
 
 Checks whether a call is in progress. This function uses an asynchronous callback to return the result.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -123,6 +131,8 @@ hasCall\(\): Promise<boolean\>
 
 Checks whether a call is in progress. This function uses a promise to return the result.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Return value**
 
 | Type| Description|
@@ -147,6 +157,8 @@ getCallState\(callback: AsyncCallback<CallState\>\): void
 
 Obtains the call status. This function uses an asynchronous callback to return the result.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -168,6 +180,8 @@ getCallState\(\): Promise<CallState\>
 
 Obtains the call status. This function uses a promise to return the result.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Return value**
 
 | Type| Description|
@@ -191,6 +205,8 @@ isEmergencyPhoneNumber\(phoneNumber: string, callback: AsyncCallback<boolean\>\)
 
 Checks whether the call number of the SIM card in the specified slot is an emergency number. This function uses an asynchronous callback to return the result.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -213,6 +229,8 @@ isEmergencyPhoneNumber\(phoneNumber: string, options: EmergencyNumberOptions, ca
 
 Checks whether the call number of the SIM card in the specified slot is an emergency number. This function uses an asynchronous callback to return the result.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -236,6 +254,8 @@ isEmergencyPhoneNumber\(phoneNumber: string, options?: EmergencyNumberOptions\):
 
 Checks whether the call number of the SIM card in the specified slot is an emergency number. This function uses a promise to return the result.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -266,6 +286,8 @@ formatPhoneNumber\(phoneNumber: string, callback: AsyncCallback<string\>\): void
 
 Formats a phone number based on the specified ISO country code. This function uses an asynchronous callback to return the result.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -288,6 +310,8 @@ formatPhoneNumber\(phoneNumber: string, options: NumberFormatOptions, callback:
 
 Formats a phone number based on specified formatting options. This function uses an asynchronous callback to return the result.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -313,6 +337,8 @@ formatPhoneNumber\(phoneNumber: string, options?: NumberFormatOptions\): Promise
 
 Formats a phone number based on specified formatting options. This function uses a promise to return the result.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -349,6 +375,8 @@ The phone number must match the specified country code. For example, for a China
 
 All country codes are supported.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -378,6 +406,8 @@ The phone number must match the specified country code. For example, for a China
 
 All country codes are supported.
 
+**System capability**: SystemCapability.Telephony.CallManager
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -407,30 +437,40 @@ promise.then(data => {
 ## DialOptions<a name=DialOptions></a>
 
 Provides an option for determining whether a call is a video call.
-| Parameter| Type| Mandatory| Description|
+
+**System capability**: SystemCapability.Telephony.CallManager
+
+| Name| Type| Mandatory| Description|
 | ------ | ------- | ---- | ------------------------------------------------------------ |
 | extras | boolean | No| Indication of a video call. The options are as follows: <br/> - **true**: video call <br/> - **false**: voice call|
 
 ## CallState<a name=CallState></a>
 
 Enumerates call states.
+
 | Variable| Value| Description|
 | ------------------ | ---- | ------------------------------------------------------------ |
-| CALL_STATE_UNKNOWN | -1   | The call status fails to be obtained and is unknown.|
-| CALL_STATE_IDLE    | 0    | No call is in progress.|
-| CALL_STATE_RINGING | 1    | The call is in the ringing or waiting state.|
-| CALL_STATE_OFFHOOK | 2    | At least one call is in dialing, active, or on hold, and no new incoming call is ringing or waiting.|
+| CALL_STATE_UNKNOWN | -1   | The call status fails to be obtained and is unknown. <br />**System capability**: SystemCapability.Telephony.CallManager|
+| CALL_STATE_IDLE    | 0    | No call is in progress. <br />**System capability**: SystemCapability.Telephony.CallManager|
+| CALL_STATE_RINGING | 1    | The call is in the ringing or waiting state. <br />**System capability**: SystemCapability.Telephony.CallManager|
+| CALL_STATE_OFFHOOK | 2    | At least one call is in dialing, active, or on hold, and no new incoming call is ringing or waiting. <br />**System capability**: SystemCapability.Telephony.CallManager|
 
 ## EmergencyNumberOptions<sup>7+</sup><a name=EmergencyNumberOptions></a>
 
 Provides an option for determining whether a number is an emergency number for the SIM card in the specified slot.
-| Parameter| Type| Mandatory| Description|
+
+**System capability**: SystemCapability.Telephony.CallManager
+
+| Name| Type| Mandatory| Description|
 | ------ | ------ | ---- | ------------------------------------------ |
 | slotId | number | No| SIM card slot ID.<br/> - **0**: slot 1 <br/> - **1**: slot 2|
 
 ## NumberFormatOptions<sup>7+</sup><a name=NumberFormatOptions></a>
 
 Provides an option for number formatting.
-| Parameter| Type| Mandatory| Description|
+
+**System capability**: SystemCapability.Telephony.CallManager
+
+| Name| Type| Mandatory| Description|
 | ----------- | ------ | ---- | ---------------------------------------------------------- |
 | countryCode | string | No| Country code, for example, **CN** (China). All country codes are supported. The default value is **CN**.|
diff --git a/en/application-dev/reference/apis/js-apis-observer.md b/en/application-dev/reference/apis/js-apis-observer.md
new file mode 100644
index 0000000000000000000000000000000000000000..bb658c1fbd35dcf714092ef915d9c6792a432dcc
--- /dev/null
+++ b/en/application-dev/reference/apis/js-apis-observer.md
@@ -0,0 +1,265 @@
+# Observer
+
+>**NOTE**
+>
+>The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+
+
+## Modules to Import
+
+```
+import observer from '@ohos.telephony.observer'
+```
+
+## observer.on('networkStateChange')<a name=observer.on.networkStateChange-callback></a>
+
+on\(type: \'networkStateChange\', callback: Callback<NetworkState\>\): void;
+
+Registers an observer for network status change events. This function uses an asynchronous callback to return the execution result.
+
+**Required permission**: ohos.permission.GET_NETWORK_INFO
+
+**System capability**: SystemCapability.Telephony.StateRegistry
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ----------------------------------------- | ---- | --------------------------------- |
+| type     | string                                    | Yes| Network status change event.|
+| callback | Callback\<[NetworkState](js-apis-radio.md#NetworkState)\> | Yes| Callback used to return the result. For details, see [NetworkState](js-apis-radio.md#NetworkState).|
+
+**Example**
+
+```
+observer.on('networkStateChange', data =>{ 
+    console.log("on networkStateChange, data:" + JSON.stringify(data));
+});
+```
+
+
+## observer.on('networkStateChange')<a name=observer.on.networkStateChange.options-callback></a>
+
+on\(type: \'networkStateChange\', options: { slotId: number }, callback: Callback<NetworkState\>\): void;
+
+Registers an observer for network status change events of the SIM card in the specified slot. This function uses an asynchronous callback to return the execution result.
+
+**Required permission**: ohos.permission.GET_NETWORK_INFO
+
+**System capability**: SystemCapability.Telephony.StateRegistry
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| ------ | ------ | ---- | -------------------------------------- |
+| type     | string                                    | Yes| Network status change event.|
+| slotId | number | Yes| Card slot ID. The options are as follows: <br/> - **0**: slot 1 <br/> - **1**: slot 2|
+| callback | Callback\<[NetworkState](js-apis-radio.md#NetworkState)\> | Yes| Callback used to return the result. For details, see [NetworkState](js-apis-radio.md#NetworkState).|
+
+**Example**
+
+```
+observer.on('networkStateChange', {slotId: 0}, data =>{ 
+    console.log("on networkStateChange, data:" + JSON.stringify(data));
+});
+```
+
+
+## observer.off('networkStateChange')<a name=observer.off.networkStateChange-callback></a>
+
+off\(type: \'networkStateChange\', callback?: Callback<NetworkState\>\): void;
+
+Unregisters the observer for network status change events. This function uses an asynchronous callback to return the execution result.
+
+**Required permission**: ohos.permission.GET_NETWORK_INFO
+
+>**NOTE**
+>
+>You can pass the callback of the **on** function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.
+
+**System capability**: SystemCapability.Telephony.StateRegistry
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ------------------------ | ---- | --------------------------------- |
+| type     | string                   | Yes| Network status change event.|
+| callback | Callback\<[NetworkState](js-apis-radio.md#NetworkState)\> | No| Callback used to return the result. For details, see [NetworkState](js-apis-radio.md#NetworkState).|
+
+**Example**
+
+```
+let callback = data => {
+    console.log("on networkStateChange, data:" + JSON.stringify(data));
+}
+observer.on('networkStateChange', callback);
+// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
+observer.off('networkStateChange', callback);
+observer.off('networkStateChange');
+```
+
+## observer.on('signalInfoChange')<a name=observer.on.signalInfoChange-callback></a>
+
+on\(type: \'signalInfoChange\', callback: Callback<Array<SignalInformation\>\>): void;
+
+Registers an observer for signal status change events. This function uses an asynchronous callback to return the execution result.
+
+**System capability**: SystemCapability.Telephony.StateRegistry
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ------------------------------------------------------------ | ---- | ------------------------------------------------------------ |
+| type     | string                                                       | Yes| Signal status change event.|
+| callback | Callback<Array<[SignalInformation](js-apis-radio.md#SignalInformation)\>\> | Yes| Callback used to return the result. For details, see [SignalInformation](js-apis-radio.md#SignalInformation).|
+
+**Example**
+
+```
+observer.on('signalInfoChange', data =>{ 
+    console.log("on signalInfoChange, data:" + JSON.stringify(data));
+});
+```
+
+
+## observer.on('signalInfoChange')<a name=observer.on.signalInfoChange.options-callback></a>
+
+on\(type: \'signalInfoChange\', options: { slotId: number }, callback: Callback<Array<SignalInformation\>\>): void;
+
+Registers an observer for signal status change events of the SIM card in the specified slot. This function uses an asynchronous callback to return the execution result.
+
+**System capability**: SystemCapability.Telephony.StateRegistry
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| ------ | ------ | ---- | -------------------------------------- |
+| type     | string                                    | Yes| Signal status change event.|
+| slotId | number | Yes| Card slot ID. The options are as follows: <br/> - **0**: slot 1 <br/> - **1**: slot 2|
+| callback | Callback<Array<[SignalInformation](js-apis-radio.md#SignalInformation)\>\> | Yes| Callback used to return the result. For details, see [SignalInformation](js-apis-radio.md#SignalInformation).|
+
+**Example**
+
+```
+observer.on('signalInfoChange', {slotId: 0}, data =>{ 
+    console.log("on signalInfoChange, data:" + JSON.stringify(data));
+});
+```
+
+
+## observer.off('signalInfoChange')<a name=observer.off.signalInfoChange-callback></a>
+
+off\(type: \'signalInfoChange\', callback?: Callback<Array<SignalInformation\>\>): void;
+
+Unregisters the observer for signal status change events. This function uses an asynchronous callback to return the execution result.
+
+>**NOTE**
+>
+>You can pass the callback of the **on** function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.
+
+**System capability**: SystemCapability.Telephony.StateRegistry
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ------------------------------------------------------------ | ---- | ------------------------------------------------------------ |
+| type     | string                                                       | Yes| Signal status change event.|
+| callback | Callback<Array<[SignalInformation](js-apis-radio.md#SignalInformation)\>\> | No| Callback used to return the result. For details, see [SignalInformation](js-apis-radio.md#SignalInformation).|
+
+**Example**
+
+```
+let callback = data => {
+    console.log("on signalInfoChange, data:" + JSON.stringify(data));
+}
+observer.on('signalInfoChange', callback);
+// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
+observer.off('signalInfoChange', callback);
+observer.off('signalInfoChange');
+```
+
+
+## observer.on('callStateChange')<a name=observer.on.callStateChange-callback></a>
+
+on(type: 'callStateChange', callback: Callback\<{ state: [CallState](js-apis-call.md#CallState), number: string }\>): void;
+
+Registers an observer for call status change events. This function uses an asynchronous callback to return the execution result.
+
+**Required permission**: ohos.permission.READ_CALL_LOG
+
+**System capability**: SystemCapability.Telephony.StateRegistry
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ------------------------------------------------------------ | ---- | ------------------------------------------------------------ |
+| type     | string                                                       | Yes| Call status change event.|
+| callback | Callback\<{ state: [CallState](js-apis-call.md#CallState), number: string }\> | Yes| Callback used to return the result. For details, see [CallState](js-apis-call.md#CallState)<br />**number**: phone number.|
+
+**Example**
+
+```
+observer.on('callStateChange', value =>{ 
+    console.log("on callStateChange, state:" + value.state + ", number:" + value.number);
+});
+```
+
+
+## observer.on('callStateChange')<a name=observer.on.callStateChange.options-callback></a>
+
+on(type: 'callStateChange', options: { slotId: number }, callback: Callback<{ state: [CallState](js-apis-call.md#CallState), number: string }>): void;
+
+Registers an observer for call status change events. This function uses an asynchronous callback to return the execution result.
+
+**Required permission**: ohos.permission.READ_CALL_LOG
+
+**System capability**: SystemCapability.Telephony.StateRegistry
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ------------------------------------------------------------ | ---- | ------------------------------------------------------------ |
+| type     | string                                                       | Yes| Call status change event.|
+| slotId   | number                                                       | Yes| Card slot ID. The options are as follows: <br/> - **0**: slot 1<br/> - **1**: slot 2|
+| callback | Callback\<{ state: [CallState](js-apis-call.md#CallState), number: string }\> | Yes| Callback used to return the result. For details, see [CallState](js-apis-call.md#CallState)<br />**number**: phone number.|
+
+**Example**
+
+```
+observer.on('callStateChange', {slotId: 0}, value =>{ 
+    console.log("on callStateChange, state:" + value.state + ", number:" + value.number);
+});
+```
+
+
+## observer.off('callStateChange')<a name=observer.off.callStateChange-callback></a>
+
+off(type: 'callStateChange', callback?: Callback<{ state: [CallState](js-apis-call.md#CallState), number: string }>): void;
+
+Unregisters the observer for call status change events. This function uses an asynchronous callback to return the execution result.
+
+**Required permission**: ohos.permission.READ_CALL_LOG
+
+>**NOTE**
+>
+>You can pass the callback of the **on** function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.
+
+**System capability**: SystemCapability.Telephony.StateRegistry
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ------------------------------------------------------------ | ---- | ------------------------------------------------------------ |
+| type     | string                                                       | Yes| Call status change event.|
+| callback | Callback\<{ state: [CallState](js-apis-call.md#CallState), number: string }\> | No| Callback used to return the result. For details, see [CallState](js-apis-call.md#CallState)<br />**number**: phone number.|
+
+**Example**
+
+```
+let callback = value => {
+    console.log("on callStateChange, state:" + value.state + ", number:" + value.number);
+}
+observer.on('callStateChange', callback);
+// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
+observer.off('callStateChange', callback);
+observer.off('callStateChange');
+```
diff --git a/en/application-dev/reference/apis/js-apis-sms.md b/en/application-dev/reference/apis/js-apis-sms.md
index 65fcef6b4fb590a5ead28ede1f2f502f7bd2b513..b3cca70e284d04d0c3f4ad09dae27a42de549252 100644
--- a/en/application-dev/reference/apis/js-apis-sms.md
+++ b/en/application-dev/reference/apis/js-apis-sms.md
@@ -16,6 +16,8 @@ createMessage\(pdu: Array<number\>, specification: string, callback: AsyncCallba
 
 Creates an SMS message instance based on the protocol data unit (PDU) and the specified SMS protocol. This function uses an asynchronous callback to return the result.
 
+**System capability**: SystemCapability.Telephony.SmsMms
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -42,6 +44,8 @@ createMessage\(pdu: Array<number\>, specification: string\): Promise<ShortMessag
 
 Creates an SMS message instance based on the PDU and the specified SMS protocol. This function uses a promise to return the result.
 
+**System capability**: SystemCapability.Telephony.SmsMms
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
@@ -75,7 +79,9 @@ sendMessage(options: SendMessageOptions): void
 
 Sends an SMS message.
 
-Before using this API, you must declare the **ohos.permission.SEND_MESSAGES** permission.
+**Required permission**: ohos.permission.SEND_MESSAGES
+
+**System capability**: SystemCapability.Telephony.SmsMms
 
 **Parameters**
 
@@ -108,11 +114,13 @@ getDefaultSmsSlotId\(callback: AsyncCallback<number\>\): void
 
 Obtains the default slot of the SIM card used to send SMS messages. This function uses an asynchronous callback to return the result.
 
+**System capability**: SystemCapability.Telephony.SmsMms
+
 **Parameters**
 
 | Name| Type| Mandatory| Description|
 | -------- | --------------------------- | ---- | ---------------------------------------- |
-| callback | AsyncCallback&lt;number&gt; | Yes| Callback used to return the result, <br/> - **0**: slot 1 <br/> - **1**: slot 2|
+| callback | AsyncCallback&lt;number&gt; | Yes| Callback used to return the result. <br/> - **0**: slot 1 <br/> - **1**: slot 2|
 
 **Example**
 
@@ -129,6 +137,8 @@ getDefaultSmsSlotId\(\): Promise<number\>
 
 Obtains the default slot of the SIM card used to send SMS messages. This function uses a promise to return the result.
 
+**System capability**: SystemCapability.Telephony.SmsMms
+
 **Return value**
 
 | Type| Description|
@@ -153,7 +163,9 @@ setSmscAddr\(slotId: number, smscAddr: string, callback: AsyncCallback<void\>\):
 
 Sets the short message service center (SMSC) address. This function uses an asynchronous callback to return the result.
 
-Before using this API, you must declare the **ohos.permission.SET\_TELEPHONY\_STATE** permission.
+**Required permission**: ohos.permission.SET_TELEPHONY_STATE (a system permission)
+
+**System capability**: SystemCapability.Telephony.SmsMms
 
 **Parameters**
 
@@ -180,7 +192,9 @@ setSmscAddr\(slotId: number, smscAddr: string\): Promise<void\>
 
 Sets the SMSC address. This function uses a promise to return the result.
 
-Before using this API, you must declare the **ohos.permission.SET\_TELEPHONY\_STATE** permission.
+**Required permission**: ohos.permission.SET_TELEPHONY_STATE (a system permission)
+
+**System capability**: SystemCapability.Telephony.SmsMms
 
 **Parameters**
 
@@ -215,7 +229,9 @@ getSmscAddr\(slotId: number, callback: AsyncCallback<string\>\): void
 
 Obtains the SMSC address. This function uses an asynchronous callback to return the result.
 
-Before using this API, you must declare the **ohos.permission.GET\_TELEPHONY\_STATE** permission.
+**Required permission**: ohos.permission.GET_TELEPHONY_STATE (a system permission)
+
+**System capability**: SystemCapability.Telephony.SmsMms
 
 **Parameters**
 
@@ -240,7 +256,9 @@ getSmscAddr\(slotId: number\): Promise<string\>
 
 Obtains the SMSC address. This function uses a promise to return the result.
 
-Before using this API, you must declare the **ohos.permission.GET\_TELEPHONY\_STATE** permission.
+**Required permission**: ohos.permission.GET_TELEPHONY_STATE (a system permission)
+
+**System capability**: SystemCapability.Telephony.SmsMms
 
 **Parameters**
 
@@ -271,6 +289,8 @@ promise.then(data => {
 
 Defines an SMS message instance.
 
+**System capability**: SystemCapability.Telephony.SmsMms
+
 | Variable| Type| Description|
 | ------------------------ | --------------------------------------- | ------------------------------------------------------------ |
 | emailAddress             | string                                  | Email address.|
@@ -295,12 +315,12 @@ Defines an SMS message instance.
 Enumerates SMS message types.
 
 | Variable| Value| Description|
-| ---------------- | ---- | ---------------------------------------- |
-| UNKNOWN          | 0    | Unknown type.|
-| INSTANT_MESSAGE  | 1    | Instant message, which is displayed immediately after being received.|
-| OPTIONAL_MESSAGE | 2    | Message stored in the device or SIM card.|
-| SIM_MESSAGE      | 3    | Message containing SIM card information, which is to be stored in the SIM card.|
-| FORWARD_MESSAGE  | 4    | Message to be forwarded to another device.|
+| ---------------- | ---- | ------------------------------------------------------------ |
+| UNKNOWN          | 0    | Unknown type. <br />**System capability**: SystemCapability.Telephony.SmsMms|
+| INSTANT_MESSAGE  | 1    | Instant message, which is displayed immediately after being received. <br />**System capability**: SystemCapability.Telephony.SmsMms|
+| OPTIONAL_MESSAGE | 2    | Message stored in the device or SIM card. <br />**System capability**: SystemCapability.Telephony.SmsMms|
+| SIM_MESSAGE      | 3    | Message containing SIM card information, which is to be stored in the SIM card. <br />**System capability**: SystemCapability.Telephony.SmsMms|
+| FORWARD_MESSAGE  | 4    | Message to be forwarded to another device. <br />**System capability**: SystemCapability.Telephony.SmsMms|
 
 
 ## SendMessageOptions<a name=SendMessageOptions></a>
@@ -309,11 +329,13 @@ Provides the options (including callbacks) for sending an SMS message.
 
 For example, you can specify the SMS message type by the optional parameter **content**.
 
+**System capability**: SystemCapability.Telephony.SmsMms
+
 | Name| Type| Mandatory| Description|
 | ---------------- | ------------------------------------------------------------ | ---- | ------------------------------------------------------------ |
 | slotId           | number                                                       | Yes| Slot ID of the SIM card used for sending SMS messages: <br/> - **0**: slot 1 <br/> - **1**: slot 2|
 | destinationHost  | string                                                       | Yes| Destination address of the SMS message.|
-| content          | string \| Array&lt;number&gt;                                | Yes| SMS message type. If the content is comprised of character strings, the SMS message is a text message. If the content is comprised of byte arrays, the SMS message is a data message.|
+| content          | string \| Array&lt;number&gt;                                | Yes| SMS message type. If the content is composed of character strings, the SMS message is a text message. If the content is composed of byte arrays, the SMS message is a data message.|
 | serviceCenter    | string                                                       | No| SMSC address. By default, the SMSC address in the SIM card is used.|
 | destinationPort  | number                                                       | No| Destination port of the SMS message. This parameter is mandatory only for a data message. Otherwise, it is optional.|
 | sendCallback     | AsyncCallback&lt;[ISendShortMessageCallback](#ISendShortMessageCallback)&gt; | No| Callback used to return the SMS message sending result. For details, see [ISendShortMessageCallback](#ISendShortMessageCallback).|
@@ -322,7 +344,9 @@ For example, you can specify the SMS message type by the optional parameter **co
 
 ## ISendShortMessageCallback<a name=ISendShortMessageCallback></a>
 
-Provides the callback for the SMS message delivery report. It consists of three parts: SMS message sending result, URI for storing the sent SMS message, and whether the SMS message is the last part of a long SMS message.
+Provides the callback for the SMS message sending result. It consists of three parts: SMS message sending result, URI for storing the sent SMS message, and whether the SMS message is the last part of a long SMS message.
+
+**System capability**: SystemCapability.Telephony.SmsMms
 
 | Name| Type| Mandatory| Description|
 | ---------- | ------------------------------- | ---- | ------------------------------------------------------------ |
@@ -333,7 +357,9 @@ Provides the callback for the SMS message delivery report. It consists of three
 
 ## IDeliveryShortMessageCallback<a name=IDeliveryShortMessageCallback></a>
 
-Provides the callback for the SMS message delivery report. Return the SMS delivery report.
+Provides the callback for the SMS message sending result. Return the SMS delivery report.
+
+**System capability**: SystemCapability.Telephony.SmsMms
 
 | Name| Type| Mandatory| Description|
 | ------ | ------------------- | ---- | -------------- |
@@ -344,6 +370,8 @@ Provides the callback for the SMS message delivery report. Return the SMS delive
 
 Enumerates SMS message sending results.
 
+**System capability**: SystemCapability.Telephony.SmsMms
+
 | Name| Value| Description|
 | ------------------------------------ | ---- | ------------------------------------------------------ |
 | SEND_SMS_SUCCESS                     | 0    | SMS message sent successfully.|
diff --git a/en/application-dev/reference/apis/js-apis-telephony-data.md b/en/application-dev/reference/apis/js-apis-telephony-data.md
new file mode 100644
index 0000000000000000000000000000000000000000..8cb2951bda1838891021ab653db926958859786c
--- /dev/null
+++ b/en/application-dev/reference/apis/js-apis-telephony-data.md
@@ -0,0 +1,289 @@
+# Cellular Data
+
+>**NOTE**
+>
+>The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+
+## Modules to Import
+
+```
+import data from '@ohos.telephony.data';
+```
+
+## data.getDefaultCellularDataSlotId<a name=data.getDefaultCellularDataSlotId-callback></a>
+
+getDefaultCellularDataSlotId(callback: AsyncCallback\<number\>): void 
+
+Obtains the default SIM card used for mobile data. This function uses an asynchronous callback to return the result. 
+
+**Required permission**: ohos.permission.GET_NETWORK_INFO
+
+**System capability**: SystemCapability.Telephony.CellularData
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ----------------------- | ---- | ------------------------------------------ |
+| callback | AsyncCallback\<number\> | Yes| Callback used to return the result. <br /> **0**: slot 1 <br/>**1**: slot 2|
+
+**Example**
+
+```
+data.getDefaultCellularDataSlotId((err, data) => {
+    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
+});
+```
+
+## data.getDefaultCellularDataSlotId<a name=data.getDefaultCellularDataSlotId-promise></a>
+
+getDefaultCellularDataSlotId(): Promise\<number\> 
+
+Obtains the default SIM card used for mobile data. This function uses a promise to return the result. 
+
+**Required permission**: ohos.permission.GET_NETWORK_INFO
+
+**System capability**: SystemCapability.Telephony.CellularData
+
+**Return value**
+
+| Type| Description|
+| ----------------- | ------------------------------------------------------------ |
+| Promise\<number\> | Promise used to return the result, wherein: <br />**0**: slot 1 <br/>**1**: slot 2|
+
+**Example**
+
+```
+let promise = data.getDefaultCellularDataSlotId();
+promise.then((data) => {
+    console.log(`test success, promise: data->${JSON.stringify(data)}`);
+}).catch((err) => {
+    console.error(`test fail, promise: err->${JSON.stringify(err)}`);
+});
+```
+
+## data.getCellularDataFlowType<a name=data.getCellularDataFlowType-callback></a>
+
+getCellularDataFlowType(callback: AsyncCallback\<DataFlowType\>): void
+
+Obtains the cellular data flow type, which can be uplink or downlink. This function uses an asynchronous callback to return the result.
+
+**System capability**: SystemCapability.Telephony.CellularData
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ---------------------------------------------- | ---- | ---------- |
+| callback | AsyncCallback\<[DataFlowType](#DataFlowType)\> | Yes| Callback used to return the result.|
+
+**Example**
+
+```
+data.getCellularDataFlowType((err, data) => {
+    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
+});
+```
+
+## data.getCellularDataFlowType<a name=data.getCellularDataFlowType-promise></a>
+
+getCellularDataFlowType(): Promise\<DataFlowType\>
+
+Obtains the cellular data flow type, which can be uplink or downlink. This function uses a promise to return the result.
+
+**System capability**: SystemCapability.Telephony.CellularData
+
+**Return value**
+
+| Type| Description|
+| ---------------------------------------- | ----------------------------------------------- |
+| Promise\<[DataFlowType](#DataFlowType)\> | Promise used to return the result. |
+
+**Example**
+
+```
+let promise = data.getCellularDataFlowType();
+promise.then((data) => {
+    console.log(`test success, promise: data->${JSON.stringify(data)}`);
+}).catch((err) => {
+    console.error(`test fail, promise: err->${JSON.stringify(err)}`);
+});
+```
+
+## data.getCellularDataState<a name=data.getCellularDataState-callback></a>
+
+getCellularDataState(callback: AsyncCallback\<DataConnectState\>): void
+
+Obtains the connection status of the packet switched (PS) domain. This function uses an asynchronous callback to return the result.
+
+**System capability**: SystemCapability.Telephony.CellularData
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ------------------------------------------------------ | ---- | ---------- |
+| callback | AsyncCallback\<[DataConnectState](#DataConnectState)\> | Yes| Callback used to return the result.|
+
+**Example**
+
+```
+data.getCellularDataState((err, data) => {
+    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
+});
+```
+
+## data.getCellularDataState<a name=data.getCellularDataState-promise></a>
+
+getCellularDataState(): Promise\<DataConnectState\>
+
+Obtains the connection status of the PS domain. This function uses a promise to return the result.
+
+**System capability**: SystemCapability.Telephony.CellularData
+
+**Return value**
+
+| Type| Description|
+| ------------------------------------------------ | ------------------------------------- |
+| Promise\<[DataConnectState](#DataConnectState)\> | Promise used to return the result.|
+
+**Example**
+
+```
+let promise = data.getCellularDataState();
+promise.then((data) => {
+    console.log(`test success, promise: data->${JSON.stringify(data)}`);
+}).catch((err) => {
+    console.error(`test fail, promise: err->${JSON.stringify(err)}`);
+});
+```
+
+## data.isCellularDataEnabled<a name=data.isCellularDataEnabled-callback></a>
+
+isCellularDataEnabled(callback: AsyncCallback\<boolean\>): void
+
+Checks whether the cellular data service is enabled. This function uses an asynchronous callback to return the result.
+
+**Required permission**: ohos.permission.GET_NETWORK_INFO
+
+**System capability**: SystemCapability.Telephony.CellularData
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ------------------------ | ---- | ------------------------------------------------------------ |
+| callback | AsyncCallback\<boolean\> | Yes| Callback used to return the result. <br />**true**: The cellular data service is enabled. <br />**false**: The cellular data service is disabled.|
+
+**Example**
+
+```
+data.isCellularDataEnabled((err, data) => {
+    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
+});
+```
+
+## data.isCellularDataEnabled<a name=data.isCellularDataEnabled-promise></a>
+
+isCellularDataEnabled(): Promise\<boolean\>
+
+Checks whether the cellular data service is enabled. This function uses a promise to return the result.
+
+**Required permission**: ohos.permission.GET_NETWORK_INFO
+
+**System capability**: SystemCapability.Telephony.CellularData
+
+**Return value**
+
+| Type| Description|
+| ------------------ | ------------------------------------------------------------ |
+| Promise\<boolean\> | Promise used to return the result, wherein: <br />**true**: The cellular data service is enabled. <br />**false**: The cellular data service is disabled.|
+
+**Example**
+
+```
+let promise = data.isCellularDataEnabled();
+promise.then((data) => {
+    console.log(`test success, promise: data->${JSON.stringify(data)}`);
+}).catch((err) => {
+    console.error(`test fail, promise: err->${JSON.stringify(err)}`);
+});
+```
+
+## data.isCellularDataRoamingEnabled<a name=data.isCellularDataRoamingEnabled-callback></a>
+
+isCellularDataRoamingEnabled(slotId: number, callback: AsyncCallback\<boolean\>): void
+
+Checks whether roaming is enabled for the cellular data service. This function uses an asynchronous callback to return the result.
+
+**Required permission**: ohos.permission.GET_NETWORK_INFO
+
+**System capability**: SystemCapability.Telephony.CellularData
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| -------- | ------------------------ | ---- | ------------------------------------------------------------ |
+| slotId   | number                   | Yes| Card slot ID. The options are as follows: <br />**0**: slot 1 <br />**1**: slot 2|
+| callback | AsyncCallback\<boolean\> | Yes| Callback used to return the result. <br />**true**: Roaming is enabled for the cellular data service. <br />**false**: Roaming is disabled for the cellular data service.|
+
+**Example**
+
+```
+data.isCellularDataRoamingEnabled(0,(err, data) => {
+    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
+});
+```
+
+## data.isCellularDataRoamingEnabled<a name=data.isCellularDataRoamingEnabled-promise></a>
+
+isCellularDataRoamingEnabled(slotId: number): Promise\<boolean\>
+
+Checks whether roaming is enabled for the cellular data service. This method uses a promise to return the result.
+
+**Required permission**: ohos.permission.GET_NETWORK_INFO
+
+**System capability**: SystemCapability.Telephony.CellularData
+
+**Parameters**
+
+| Name| Type| Mandatory| Description|
+| ------ | ------ | ---- | ---------------------------------------- |
+| slotId | number | Yes| Card slot ID. The options are as follows: <br />**0**: slot 1 <br/>**1**: slot 2|
+
+**Return value**
+
+| Type| Description|
+| ------------------ | ------------------------------------------------------------ |
+| Promise\<boolean\> | Promise used to return the result, wherein: <br />**true**: Roaming is enabled for the cellular data service. <br />**false**: Roaming is disabled for the cellular data service.|
+
+**Example**
+
+```
+let promise = data.isCellularDataRoamingEnabled(0);
+promise.then((data) => {
+    console.log(`test success, promise: data->${JSON.stringify(data)}`);
+}).catch((err) => {
+    console.error(`test fail, promise: err->${JSON.stringify(err)}`);
+});
+```
+
+## DataFlowType<a name=DataFlowType></a>
+
+ Defines the cellular data flow type.
+
+| Name| Value| Description|
+| ------ | ---------------------- | ------------------------------------------------------------ |
+| 0      | DATA_FLOW_TYPE_NONE    | No uplink or downlink data is available. <br />**System capability**: SystemCapability.Telephony.CellularData|
+| 1      | DATA_FLOW_TYPE_DOWN    | Only the downlink data is available. <br />**System capability**: SystemCapability.Telephony.CellularData|
+| 2      | DATA_FLOW_TYPE_UP      | Only the uplink data is available. <br />**System capability**: SystemCapability.Telephony.CellularData|
+| 3      | DATA_FLOW_TYPE_UP_DOWN | Both uplink data and downlink data are available. <br />**System capability**: SystemCapability.Telephony.CellularData|
+| 4      | DATA_FLOW_TYPE_DORMANT | No uplink or downlink data is available because the lower-layer link is in the dormant state. <br />**System capability**: SystemCapability.Telephony.CellularData|
+
+## DataConnectState<a name=DataConnectState></a>
+
+ Describes the connection status of a cellular data link.
+
+| Name| Value| Description|
+| ------ | ----------------------- | ------------------------------------------------------------ |
+| -1     | DATA_STATE_UNKNOWN| The status of the cellular data link is unknown. <br />**System capability**: SystemCapability.Telephony.CellularData|
+| 0      | DATA_STATE_DISCONNECTED | The cellular data link is disconnected. <br />**System capability**: SystemCapability.Telephony.CellularData|
+| 1      | DATA_STATE_CONNECTING   | The cellular data link is being connected. <br />**System capability**: SystemCapability.Telephony.CellularData|
+| 2      | DATA_STATE_CONNECTED    | The cellular data link is connected. <br />**System capability**: SystemCapability.Telephony.CellularData|
+| 3      | DATA_STATE_SUSPENDED    | The cellular data link is suspended. <br />**System capability**: SystemCapability.Telephony.CellularData|