android.permission.READ_PHONE_STATE
  - read phone status and identity
 
  - Allows the app to access the phone features of the device. This permission allows the app to determine the phone number and device IDs, whether a call is active, and the remote number connected by a call.
 
Belongs to: 
android.permission-group.PHONE_CALLS
  - Phone calls
 
  - Monitor, record, and process phone calls.