# Radio

The radio module provides basic network search management functions. You can obtain the radio access technology (RAT) used in the CS and PS domains, network status, current network selection mode, ISO country code of the registered network, ID of the slot in which the primary card is located, list of signal strengths of the registered network, carrier name, and IMEI, MEID, and unique device ID of the SIM card in the specified slot. Besides, you can check whether the current device supports 5G\(NR\) and whether the radio service is enabled on the primary SIM card.

>**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 radio from '@ohos.telephony.radio'
```

## radio.getRadioTech

getRadioTech\(slotId: number, callback: AsyncCallback<\{psRadioTech: RadioTechnology, csRadioTech: RadioTechnology\}\>\): void

Obtains the RAT used in the CS and PS domains for the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

**Required permission**: ohos.permission.GET_NETWORK_INFO

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                  |
| -------- | ------------------------------------------------------------ | ---- | -------------------------------------- |
| slotId   | number                                                       | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|
| callback | AsyncCallback\<{psRadioTech: [RadioTechnology](#radiotechnology), csRadioTech:[RadioTechnology](#radiotechnology)}\> | Yes  | Callback used to return the result.                            |

**Example**

```js
let slotId = 0;
radio.getRadioTech(slotId, (err, data) =>{ 
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getRadioTech

getRadioTech\(slotId: number\): Promise<\{psRadioTech: RadioTechnology, csRadioTech: RadioTechnology\}\>

Obtains the RAT used in the CS and PS domains for the SIM card in the specified slot. This API uses a promise to return the result.

**Required permission**: ohos.permission.GET_NETWORK_INFO

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|

**Return value**

| Type                                                        | Description                                           |
| ------------------------------------------------------------ | ----------------------------------------------- |
| Promise<{psRadioTech: [RadioTechnology](#radiotechnology), csRadioTech: [RadioTechnology](#radiotechnology)}> | Promise used to return the result.|

**Example**

```js
let slotId = 0;
let promise = radio.getRadioTech(slotId);
promise.then(data => {
    console.log(`getRadioTech success, data->${JSON.stringify(data)}`);
}).catch(err => {
    console.log(`getRadioTech fail, err->${JSON.stringify(err)}`);
});
```


## radio.getNetworkState

getNetworkState\(callback: AsyncCallback<NetworkState\>\): void

Obtains the network status. This API uses an asynchronous callback to return the result.

**Required permission**: ohos.permission.GET_NETWORK_INFO

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                                          | Mandatory| Description      |
| -------- | ---------------------------------------------- | ---- | ---------- |
| callback | AsyncCallback\<[NetworkState](#networkstate)\> | Yes  | Callback used to return the result.|

**Example**

```js
radio.getNetworkState((err, data) =>{
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getNetworkState

getNetworkState\(slotId: number, callback: AsyncCallback<NetworkState\>\): void

Obtains the network status of the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

**Required permission**: ohos.permission.GET_NETWORK_INFO

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                                          | Mandatory| Description                                  |
| -------- | ---------------------------------------------- | ---- | -------------------------------------- |
| slotId   | number                                         | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|
| callback | AsyncCallback\<[NetworkState](#networkstate)\> | Yes  | Callback used to return the result.                            |

**Example**

```js
let slotId = 0;
radio.getNetworkState(slotId, (err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getNetworkState

getNetworkState\(slotId?: number\): Promise<NetworkState\>

Obtains the network status of the SIM card in the specified slot. This API uses a promise to return the result.

**Required permission**: ohos.permission.GET_NETWORK_INFO

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | No  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|

**Return value**

| Type                                    | Description                       |
| ---------------------------------------- | --------------------------- |
| Promise\<[NetworkState](#networkstate)\> | Promise used to return the result.|

**Example**

```js
let slotId = 0;
let promise = radio.getNetworkState(slotId);
promise.then(data => {
    console.log(`getNetworkState success, promise: data->${JSON.stringify(data)}`);
}).catch(err => {
    console.log(`getNetworkState fail, promise: err->${JSON.stringify(err)}`);
});
```


## radio.getNetworkSelectionMode

getNetworkSelectionMode\(slotId: number, callback: AsyncCallback<NetworkSelectionMode\>\): void

Obtains the network selection mode of the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                  |
| -------- | ------------------------------------------------------------ | ---- | -------------------------------------- |
| slotId   | number                                                       | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|
| callback | AsyncCallback\<[NetworkSelectionMode](#networkselectionmode)\> | Yes  | Callback used to return the result.                            |

**Example**

```js
let slotId = 0;
radio.getNetworkSelectionMode(slotId, (err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getNetworkSelectionMode

getNetworkSelectionMode\(slotId: number\): Promise<NetworkSelectionMode\>

Obtains the network selection mode of the SIM card in the specified slot. This API uses a promise to return the result.

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|

**Return value**

| Type                                                    | Description                           |
| -------------------------------------------------------- | ------------------------------- |
| Promise\<[NetworkSelectionMode](#networkselectionmode)\> | Promise used to return the result.|

**Example**

```js
let slotId = 0;
let promise = radio.getNetworkSelectionMode(slotId);
promise.then(data => {
    console.log(`getNetworkSelectionMode success, promise: data->${JSON.stringify(data)}`);
}).catch(err => {
    console.log(`getNetworkSelectionMode fail, promise: err->${JSON.stringify(err)}`);
});
```


## radio.getISOCountryCodeForNetwork<sup>7+</sup>

getISOCountryCodeForNetwork\(slotId: number, callback: AsyncCallback<string\>\): void

Obtains the ISO country code of the network with which the SIM card in the specified slot is registered. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                   | Mandatory| Description                                    |
| -------- | ----------------------- | ---- | ---------------------------------------- |
| slotId   | number                  | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2  |
| callback | AsyncCallback\<string\> | Yes  | Callback used to return the result, which is an ISO country code, for example, **CN** (China).|

**Example**

```js
let slotId = 0;
radio.getISOCountryCodeForNetwork(slotId, (err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getISOCountryCodeForNetwork<sup>7+</sup>

getISOCountryCodeForNetwork\(slotId: number\): Promise<string\>

Obtains the ISO country code of the network with which the SIM card in the specified slot is registered. This API uses a promise to return the result.

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|

**Return value**

| Type             | Description                                                        |
| ----------------- | ------------------------------------------------------------ |
| Promise\<string\> | Promise used to return the result, which is an ISO country code, for example, **CN** (China).|

**Example**

```js
let slotId = 0;
let promise = radio.getISOCountryCodeForNetwork(slotId);
promise.then(data => {
    console.log(`getISOCountryCodeForNetwork success, promise: data->${JSON.stringify(data)}`);
}).catch(err => {
    console.log(`getISOCountryCodeForNetwork fail, promise: err->${JSON.stringify(err)}`);
});
```


## radio.getPrimarySlotId<sup>7+</sup>

getPrimarySlotId\(callback: AsyncCallback\<number\>\): void

Obtains the ID of the slot in which the primary card is located. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                                        |
| -------- | ------------------------------------------------------------ | ---- | ------------------------------------------------------------ |
| callback | AsyncCallback\<number\> | Yes  | Callback used to return the result.|

**Example**

```js
radio.getPrimarySlotId((err, data) => {
   console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getPrimarySlotId<sup>7+</sup>

getPrimarySlotId\(\): Promise\<number\>

Obtains the ID of the slot in which the primary card is located. This API uses a promise to return the result.

**System capability**: SystemCapability.Telephony.CoreService

**Return value**

| Type                                                       | Description                                                        |
| ----------------------------------------------------------- | ------------------------------------------------------------ |
| Promise\<number\> | Promise used to return the result.|

**Example**

```js
let promise = radio.getPrimarySlotId();
promise.then(data => {
    console.log(`getPrimarySlotId success, promise: data->${JSON.stringify(data)}`);
}).catch(err => {
    console.error(`getPrimarySlotId fail, promise: err->${JSON.stringify(err)}`);
});
```


## radio.getSignalInformation<sup>7+</sup>

getSignalInformation\(slotId: number, callback: AsyncCallback<Array<SignalInformation\>\>\): void

Obtains a list of signal strengths of the network with which the SIM card in the specified slot is registered. This API uses an asynchronous callback to return the result. 

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                                                        | Mandatory| Description                                                        |
| -------- | ------------------------------------------------------------ | ---- | ------------------------------------------------------------ |
| slotId   | number                                                       | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2                      |
| callback | AsyncCallback\<Array\<[SignalInformation](#signalinformation)\>\> | Yes  | Callback used to return the result, which is a list of [SignalInformation](#signalinformation) objects.|

**Example**

```js
let slotId = 0;
radio.getSignalInformation(slotId, (err, data) => {
   console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getSignalInformation<sup>7+</sup>

getSignalInformation\(slotId: number\): Promise<Array<SignalInformation\>\>

Obtains a list of signal strengths of the network with which the SIM card in the specified slot is registered. This API uses a promise to return the result. 

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|

**Return value**

| Type                                                       | Description                                                        |
| ----------------------------------------------------------- | ------------------------------------------------------------ |
| Promise\<Array\<[SignalInformation](#signalinformation)\>\> | Promise used to return the result, which is a list of [SignalInformation](#signalinformation) objects.|

**Example**

```js
let slotId = 0;
let promise = radio.getSignalInformation(slotId);
promise.then(data => {
    console.log(`getSignalInformation success, promise: data->${JSON.stringify(data)}`);
}).catch(err => {
    console.error(`getSignalInformation fail, promise: err->${JSON.stringify(err)}`);
});
```


## radio.isNrSupported<sup>8+</sup>

isNrSupported\(slotId: number\): boolean

Checks whether the current device supports 5G \(NR\).

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|

**Return value**

| Type              | Description                                                        |
| ------------------ | ------------------------------------------------------------ |
| boolean | - **true**: The current device supports 5G \(NR\).<br>- **false**: The current device does not support 5G \(NR\).|

**Example**

```js
let slotId = 0;
let result = radio.isNrSupported(slotId);
console.log("Result: "+ result);
```


## radio.isRadioOn<sup>7+</sup>

isRadioOn\(callback: AsyncCallback<boolean\>\): void

Checks whether the radio service is enabled on the primary SIM card. This API uses an asynchronous callback to return the result.

**Required permission**: ohos.permission.GET_NETWORK_INFO

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                    | Mandatory| Description                                                   |
| -------- | ------------------------ | ---- | ------------------------------------------------------- |
| callback | AsyncCallback\<boolean\> | Yes  | Callback used to return the result.<br>- **true**: The radio service is enabled.<br>- **false**: The radio service is disabled.|

**Example**

```js
radio.isRadioOn((err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.isRadioOn<sup>7+</sup>

isRadioOn\(slotId: number, callback: AsyncCallback<boolean\>\): void

Checks whether the radio service is enabled on the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

**Required permission**: ohos.permission.GET_NETWORK_INFO

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                    | Mandatory| Description                                                   |
| -------- | ------------------------ | ---- | ------------------------------------------------------- |
| slotId   | number                   | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2                 |
| callback | AsyncCallback\<boolean\> | Yes  | Callback used to return the result.<br>- **true**: The radio service is enabled.<br>- **false**: The radio service is disabled.|

**Example**

```js
let slotId = 0;
radio.isRadioOn(slotId, (err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.isRadioOn<sup>7+</sup>

isRadioOn\(slotId?: number\): Promise<boolean\>

Checks whether the radio service is enabled. This API uses a promise to return the result.

**Required permission**: ohos.permission.GET_NETWORK_INFO

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | No  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2<br>If the slot ID is not specified, this API is defaulted to check whether the radio service is enabled on the primary SIM card.|

**Return value**

| Type              | Description                                                        |
| ------------------ | ------------------------------------------------------------ |
| Promise\<boolean\> | Promise used to return the result.<br>- **true**: The radio service is enabled.<br>- **false**: The radio service is disabled.|

**Example**

```js
let slotId = 0;
let promise = radio.isRadioOn(slotId);
promise.then(data => {
    console.log(`isRadioOn success, promise: data->${JSON.stringify(data)}`);
}).catch(err => {
    console.error(`isRadioOn fail, promise: err->${JSON.stringify(err)}`);
});
```


## radio.getOperatorName<sup>7+</sup>

getOperatorName\(slotId: number, callback: AsyncCallback<string\>\): void

Obtains the carrier name. This API uses an asynchronous callback to return the result.

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                   | Mandatory| Description                                      |
| -------- | ----------------------- | ---- | ------------------------------------------ |
| slotId   | number                  | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2    |
| callback | AsyncCallback\<string\> | Yes  | Callback used to return the result, which is the carrier name, for example, China Mobile.|

**Example**

```js
let slotId = 0;
radio.getOperatorName(slotId, (err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getOperatorName<sup>7+</sup>

getOperatorName\(slotId: number\): Promise<string\>

Obtains the carrier name. This API uses a promise to return the result.

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|

**Return value**

| Type             | Description                                                        |
| ----------------- | ------------------------------------------------------------ |
| Promise\<string\> | Promise used t return the result, which is the carrier name, for example, China Mobile.               |

**Example**

```js
let slotId = 0;
let promise = radio.getOperatorName(slotId);
promise.then(data => {
    console.log(`getOperatorName success, promise: data->${JSON.stringify(data)}`);
}).catch(err => {
    console.log(`getOperatorName fail, promise: err->${JSON.stringify(err)}`);
});
```

## radio.setPrimarySlotId<sup>8+</sup>

setPrimarySlotId(slotId: number, callback: AsyncCallback<void\>): void

Sets the ID of the slot in which the primary card is located. This API uses an asynchronous callback to return the result.

This is a system API.

**Required permission**: ohos.permission.SET_TELEPHONY_STATE

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                 | Mandatory| Description                                  |
| -------- | --------------------- | ---- | -------------------------------------- |
| slotId   | number                | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|
| callback | AsyncCallback\<void\> | Yes  | Callback used to return the result. |

**Example**

```js
let slotId = 0;
radio.setPrimarySlotId(slotId, (err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.setPrimarySlotId<sup>8+</sup>

setPrimarySlotId\(slotId: number\): Promise\<void\>

Sets the ID of the slot in which the primary card is located. This API uses a promise to return the result.

This is a system API.

**Required permission**: ohos.permission.SET_TELEPHONY_STATE

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|

**Return value**

| Type           | Description                           |
| --------------- | ------------------------------- |
| Promise\<void\> | Promise used to return the result.|

**Example**

```js
let slotId = 0;
let promise = radio.setPrimarySlotId(slotId);
promise.then(data => {
    console.log(`setPrimarySlotId success, promise: data->${JSON.stringify(data)}`);
}).catch(err => {
    console.log(`setPrimarySlotId fail, promise: err->${JSON.stringify(err)}`);
});
```

## radio.getIMEI<sup>8+</sup>

getIMEI(callback: AsyncCallback<string\>): void

Obtains the IMEI of the SIM card in a card slot. This API uses an asynchronous callback to return the result.

This is a system API.

**Required permission**: ohos.permission.GET_TELEPHONY_STATE

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                   | Mandatory| Description                                      |
| -------- | ----------------------- | ---- | ------------------------------------------ |
| callback | AsyncCallback\<string\> | Yes  | Callback used to return the result. If the IMEI does not exist, an empty string is returned.|

**Example**

```js
radio.getIMEI((err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getIMEI<sup>8+</sup>

getIMEI(slotId: number, callback: AsyncCallback<string\>): void

Obtains the IMEI of the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

This is a system API.

**Required permission**: ohos.permission.GET_TELEPHONY_STATE

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                   | Mandatory| Description                                      |
| -------- | ----------------------- | ---- | ------------------------------------------ |
| slotId   | number                  | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2    |
| callback | AsyncCallback\<string\> | Yes  | Callback used to return the result. If the IMEI does not exist, an empty string is returned.|

**Example**

```js
let slotId = 0;
radio.getIMEI(slotId, (err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getIMEI<sup>8+</sup>

getIMEI(slotId?: number): Promise<string\>

Obtains the IMEI of the SIM card in a card slot. This API uses a promise to return the result.

This is a system API.

**Required permission**: ohos.permission.GET_TELEPHONY_STATE

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | No  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|

**Return value**

| Type             | Description                                      |
| ----------------- | ------------------------------------------ |
| Promise\<string\> | Promise used to return the result. If the IMEI does not exist, an empty string is returned.|

**Example**

```js
let slotId = 0;
let promise = radio.getIMEI(slotId);
promise.then(data => {
    console.log(`getIMEI success, promise: data->${JSON.stringify(data)}`);
}).catch(err => {
    console.error(`getIMEI fail, promise: err->${JSON.stringify(err)}`);
});
```

## radio.getMEID<sup>8+</sup>

getMEID(callback: AsyncCallback<string\>): void

Obtains the MEID of the SIM card in a card slot. This API uses an asynchronous callback to return the result.

This is a system API.

**Required permission**: ohos.permission.GET_TELEPHONY_STATE

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                   | Mandatory| Description      |
| -------- | ----------------------- | ---- | ---------- |
| callback | AsyncCallback\<string\> | Yes  | Callback used to return the result.|

**Example**

```js
radio.getMEID((err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getMEID<sup>8+</sup>

getMEID(slotId: number, callback: AsyncCallback<string\>): void

Obtains the MEID of the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

This is a system API.

**Required permission**: ohos.permission.GET_TELEPHONY_STATE

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                   | Mandatory| Description                                  |
| -------- | ----------------------- | ---- | -------------------------------------- |
| slotId   | number                  | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|
| callback | AsyncCallback\<string\> | Yes  | Callback used to return the result.                            |

**Example**

```js
let slotId = 0;
radio.getMEID(slotId, (err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getMEID<sup>8+</sup>

getMEID(slotId?: number): Promise<string\>

Obtains the MEID of the SIM card in the specified slot. This API uses a promise to return the result.

This is a system API.

**Required permission**: ohos.permission.GET_TELEPHONY_STATE

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | No  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|

**Return value**

| Type             | Description                                   |
| ----------------- | --------------------------------------- |
| Promise\<string\> | Promise used to return the result.|

**Example**

```js
let slotId = 0;
let promise = radio.getMEID(slotId);
promise.then(data => {
    console.log(`getMEID success, promise: data->${JSON.stringify(data)}`);
}).catch(err => {
    console.error(`getMEID fail, promise: err->${JSON.stringify(err)}`);
});
```

## radio.getUniqueDeviceId<sup>8+</sup>

getUniqueDeviceId(callback: AsyncCallback<string\>): void

Obtains the unique device ID of the SIM card in a card slot. This API uses an asynchronous callback to return the result.

This is a system API.

**Required permission**: ohos.permission.GET_TELEPHONY_STATE

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                   | Mandatory| Description      |
| -------- | ----------------------- | ---- | ---------- |
| callback | AsyncCallback\<string\> | Yes  | Callback used to return the result.|

**Example**

```js
radio.getUniqueDeviceId((err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getUniqueDeviceId<sup>8+</sup>

getUniqueDeviceId(slotId: number, callback: AsyncCallback<string\>): void

Obtains the unique device ID of the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

This is a system API.

**Required permission**: ohos.permission.GET_TELEPHONY_STATE

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name  | Type                   | Mandatory| Description                                  |
| -------- | ----------------------- | ---- | -------------------------------------- |
| slotId   | number                  | Yes  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|
| callback | AsyncCallback\<string\> | Yes  | Callback used to return the result.                            |

**Example**

```js
let slotId = 0;
radio.getUniqueDeviceId(slotId, (err, data) => {
    console.log(`callback: err->${JSON.stringify(err)}, data->${JSON.stringify(data)}`);
});
```


## radio.getUniqueDeviceId<sup>8+</sup>

getUniqueDeviceId(slotId?: number): Promise<string\>

Obtains the unique device ID of the SIM card in the specified slot. This API uses a promise to return the result.

This is a system API.

**Required permission**: ohos.permission.GET_TELEPHONY_STATE

**System capability**: SystemCapability.Telephony.CoreService

**Parameters**

| Name| Type  | Mandatory| Description                                  |
| ------ | ------ | ---- | -------------------------------------- |
| slotId | number | No  | Card slot ID.<br>- **0**: card slot 1<br>- **1**: card slot 2|

**Return value**

| Type             | Description                                         |
| ----------------- | --------------------------------------------- |
| Promise\<string\> | Promise used to return the result.|

**Example**

```js
let slotId = 0;
let promise = radio.getUniqueDeviceId(slotId);
promise.then(data => {
    console.log(`getUniqueDeviceId success, promise: data->${JSON.stringify(data)}`);
}).catch(err => {
    console.error(`getUniqueDeviceId fail, promise: err->${JSON.stringify(err)}`);
});
```

## RadioTechnology

Enumerates the RAT.

**System capability**: SystemCapability.Telephony.CoreService

| Name                     | Value  | Description                                                        |
| ------------------------- | ---- | ------------------------------------------------------------ |
| RADIO_TECHNOLOGY_UNKNOWN  | 0    | Unknown RAT                                   |
| RADIO_TECHNOLOGY_GSM      | 1    | Global System for Mobile Communication (GSM) |
| RADIO_TECHNOLOGY_1XRTT    | 2    | Single-Carrier Radio Transmission Technology (1XRTT)|
| RADIO_TECHNOLOGY_WCDMA    | 3    | Wideband Code Division Multiple Access (WCDMA)|
| RADIO_TECHNOLOGY_HSPA     | 4    | High Speed Packet Access (HSPA)              |
| RADIO_TECHNOLOGY_HSPAP    | 5    | Evolved High Speed Packet Access (HSPA+)    |
| RADIO_TECHNOLOGY_TD_SCDMA | 6    | Time Division Synchronous Code Division Multiple Access (TD-SCDMA)|
| RADIO_TECHNOLOGY_EVDO     | 7    | Evolution-Data Optimized (EVDO)                  |
| RADIO_TECHNOLOGY_EHRPD    | 8    | Evolved High Rate Package Data (EHRPD)       |
| RADIO_TECHNOLOGY_LTE      | 9    | Long Term Evolution (LTE)                    |
| RADIO_TECHNOLOGY_LTE_CA   | 10   | Long Term Evolution_Carrier Aggregation (LTE_CA)|
| RADIO_TECHNOLOGY_IWLAN    | 11   | Industrial Wireless LAN (IWLAN)              |
| RADIO_TECHNOLOGY_NR       | 12   | New Radio (NR)                               |


## SignalInformation

Defines the signal strength.

**System capability**: SystemCapability.Telephony.CoreService

| Name     | Type                       | Description              |
| ----------- | --------------------------- | ------------------ |
| signalType  | [NetworkType](#networktype) | Signal strength type.|
| signalLevel | number                      | Signal strength level.|


## NetworkType

Enumerates network types.

**System capability**: SystemCapability.Telephony.CoreService

| Name                | Value  | Description                                                        |
| -------------------- | ---- | ------------------------------------------------------------ |
| NETWORK_TYPE_UNKNOWN | 0    | Unknown network.                                              |
| NETWORK_TYPE_GSM     | 1    | GSM network.   |
| NETWORK_TYPE_CDMA    | 2    | CDMA network.           |
| NETWORK_TYPE_WCDMA   | 3    | WCDMA network. |
| NETWORK_TYPE_TDSCDMA | 4    | TD-SCDMA network.|
| NETWORK_TYPE_LTE     | 5    | LTE network.                      |
| NETWORK_TYPE_NR      | 6    | 5G NR network.                              |

## NetworkState

Defines the network status.

**System capability**: SystemCapability.Telephony.CoreService

| Name           | Type                 | Description                                                        |
| ----------------- | --------------------- | ------------------------------------------------------------ |
| longOperatorName  | string                | Long carrier name of the registered network.|
| shortOperatorName | string                | Short carrier name of the registered network.|
| plmnNumeric       | string                | PLMN code of the registered network.|
| isRoaming         | boolean               | Whether the user is roaming.|
| regState          | [RegState](#regstate) | Network registration status of the device.|
| cfgTech<sup>8+</sup> | [RadioTechnology](#radiotechnology) | RAT of the device.|
| nsaState          | [NsaState](#nsastate) | NSA network registration status of the device.|
| isCaActive        | boolean               | CA status.|
| isEmergency       | boolean               | Whether only emergency calls are allowed.|


## RegState

Defines the network status.

**System capability**: SystemCapability.Telephony.CoreService

| Name                         | Value  | Description                      |
| ----------------------------- | ---- | -------------------------- |
| REG_STATE_NO_SERVICE          | 0    | The device cannot use any service.    |
| REG_STATE_IN_SERVICE          | 1    | The device can use services normally.     |
| REG_STATE_EMERGENCY_CALL_ONLY | 2    | The device can use only the emergency call service.|
| REG_STATE_POWER_OFF           | 3    | The cellular radio service is disabled.        |


## NsaState

Enumerates NSA network states.

**System capability**: SystemCapability.Telephony.CoreService

| Name                      | Value  | Description                                                      |
| -------------------------- | ---- | ---------------------------------------------------------- |
| NSA_STATE_NOT_SUPPORT      | 1    | The device is in idle or connected state in an LTE cell that does not support NSA.        |
| NSA_STATE_NO_DETECT        | 2    | The device is in the idle state in an LTE cell that supports NSA but not NR coverage detection.|
| NSA_STATE_CONNECTED_DETECT | 3    | The device is connected to the LTE network in an LTE cell that supports NSA and NR coverage detection.         |
| NSA_STATE_IDLE_DETECT      | 4    | The device is in the idle state in an LTE cell that supports NSA and NR coverage detection.          |
| NSA_STATE_DUAL_CONNECTED   | 5    | The device is connected to the LTE/NR network in an LTE cell that supports NSA.              |
| NSA_STATE_SA_ATTACHED      | 6    | The device is idle or connected to the NG-RAN cell when being attached to the 5G Core.     |


## NetworkSelectionMode

Enumerates network selection modes.

**System capability**: SystemCapability.Telephony.CoreService

| Name                       | Value  | Description          |
| --------------------------- | ---- | -------------- |
| NETWORK_SELECTION_UNKNOWN   | 0    | Unknown network selection mode.|
| NETWORK_SELECTION_AUTOMATIC | 1    | Automatic network selection mode.|
| NETWORK_SELECTION_MANUAL    | 2    | Manual network selection mode.|