Screen goes blank during or after the call and does not come back I have an Android 2.3.6 phone. 

The problem is the screen goes blank and unresponsive during or after the call.
I can't make or receive any call once the screen goes blank.
In Android 2.3.6, there is no proximity control.

If I do a missed call to my number, then the screen comes back.
The free app Screebl Lite will fix this problem with phone calls. However, it creates another annoying problem after installation - the screen won't shut off or standby without you physically tapping the phone's power button. 

Tested on a Samsung Galaxy Proclaim, running Android 2.3.6 Gingerbread.