Iphone 4 background stays lit during calls

My iPhone 4 stays lit during calls and causes battery to run low and inadvertently mute me. I've had my screen replaced by citymac and after doing some research I'm guessing it's the proximity sensor. Is there a setting on my phone to turn off the background in a call or is it a valid assumption to make that the proximity sensor is screwed up. If so, how much will it cost to fix?
Thanks in advance,
Zach

Hi,
Is Your iPhone Under Warranty?
The Proximity Sensor , The Black Spot ( Above The EarPiece ) Has Been Damaged Or Is Faulty.
If Your iPhone Is Under Warranty, You Can Give It To Apple Or You Can Get It Changed By A Third-Party Dealer.
I Cannot Comment On The Pricing As The Cost And Quality Of Sensors Is Different Everywhere.
Thanks.
Hope This Helps.

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IPhone 4 stays lit during calls

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Hello
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Thanks you
Nina

Hi Nina,
Thanks for visiting Apple Support Communities.
If you are having trouble with calls on your iPhone, try the troubleshooting steps in this article first:
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http://support.apple.com/kb/TS3406
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I receive a call via carrier (typical method)
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Reboot, Toggle Airplane-mode
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Sync with iTunes
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Hi, chasingwind.
Thank you for visiting Apple Support Communities.
I understand that you are unable to hear via the receiver during a call. I see you have tried some troubleshooting steps with the issue persisting. There are just a couple more steps that I would recommend going through in the article below.
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http://support.apple.com/en-us/HT203800
If the issue persists, see the section labeled Get more help.
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Iphone 4 background stays lit during calls

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