| callback | AsyncCallback\<Array\<[SignalInformation](#signalinformation)\>\> | Yes | Callback used to return the result, which is a list of [SignalInformation](#signalinformation) objects.|
**Example**
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@@ -362,7 +362,7 @@ Obtains a list of signal strengths of the network with which the SIM card in the
| 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**
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@@ -478,7 +478,7 @@ Checks whether the radio service is enabled. This API uses a promise to return t
| slotId | number | No | Card slot ID. The options are as follows:<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.|
| 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**
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@@ -511,7 +511,7 @@ Obtains the carrier name. This API uses an asynchronous callback to return the r