Having problem with proximity sensor iphone 4?

I'm having issues with proximity sensor in iphone 4 iOS 7 beta 6
Whenever there's any call the screen doesn't go off
I've reset all settings as well as network setting
Still facing the same problem
Please help me as I'm facing too many problems

I WAS WONDERING IS THERE ANY RELATION B/W THE PROXIMITY SENSOR AND THE HOME BUTTON?
As my home button is not working

Its all OS issue.
Please upgrade firmware version or visit apple service center to sort out this.

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