public class PhoneCallReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Bundle extras = intent.getExtras();
        if(extras != null){
            String state = extras.getString(TelephonyManager.EXTRA_STATE);
            if(state.equals(TelephonyManager.EXTRA_INCOMING_NUMBER)){
            String phoneNumber = extras.getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
            Log.w("DEBUG", phoneNumber);
            }
        }
    }
}