Which of the following are true about PhoneStateIntentReceiver.notifyPhoneCallState?
notifyPhoneCallState has to be called if your application wishes to receive a notification about an incoming phone call.
notifyPhoneCallState is a call back function that is called when the call state changes.
notifyPhoneCallState is called to initiate a call from the device.
notifyPhoneCallState is used to send notifications about call states.
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