HT201412 IPhone 4S call problem

On my Iphone 4S when I try to end a call by touching the "end" the screen goes blank before ending.  I hit the home button and the call comes back up still going but then the screen goes blank before I can hit the "end".  Sometimes hitting the "end" does not end the call. I have tried resetting. Nothing helps.  Any ideas???

Sounds like a Proximity sensor issue or possibly something corrupted in iOS.
To rule out the Proximity sensor, remove any screen protectors or cases from the device.
If that does not resolve, basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new).  Try each of these in order until the issue is resolved.

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    Hello SamSax
    Check out the assist page below for troubleshooting call connectivity.
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    Thanks for using Apple Support Communities.
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    Hello tashi1234,
    Welcome to the Apple Support Communities. If you are having an issues with the Phone app on your iPhone, the next step would be to restore the iPhone. The following will assist with backing up your iPhone.
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    http://support.apple.com/kb/HT1766
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