I'm writing an app, which listens to GSM signal strength. I've created a 
service, in which I put the PhoneStateListener. The problem is, that 
PhoneStateListener does not listen to any changes while phone is in sleep 
mode. I really need to solve that problem, could anyone help me with this? 
I tried to use that code in onCreate() method:

PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
wakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK, "call_lock");
wakeLock.acquire();

but it doesn't solve my problem, listener is still not listening in sleep 
mode.

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