while on a call random programs open up

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how do i stop this? i'd like the phone to automatically lock or something to prevent this from happening. it appears that first, the screen with all of your apps opens, then my cheek or whatever hits a program. any ideas? thanks

Does this happen when you make a call, or when a call comes in?
If you phone is locked and you get an incoming call, after you answer it remains locked except for the calling options (i.e end call, flash, etc.) but I'm not too sure if you dial out though but ive never had this problem...

this happenes to me too. my cheek will hit the screen and either open things or call someone else while on the phone. It is annoying.

This really should not happen, as the device has a proximity sensor that should turn off the screen when the device is held up to your face. If you make a call with the phone held in your hand and you cover up the top of the phone, say the top 2 inches, with your other hand, does the screen blank? It should. If not, the proximity sensor may be bad and a replacement is in order.