Light sensor not working during calls

My iPhone 4 has been working fine since May, until recently...when my light sensor wasn`t working really well, when i am on a phone call, the screen doesn`t turn off even though i place the phone just beside my ears and this is very annoying as my ears will touch the loud speaker button and i have to turn it off frequently during a call...but the sensor works fine for the screen brightness as for auto brightness, i have only dropped my phone once, never been jailbroken before..i have also restored my phone, reset all settings in the phone but none of them helped, is there any alternative way to solve this annoying problem?

The sensor you refer to is a proximity sensor (not a light sensor) and is not sensitive to light.  It is sensitive to an object close by, i.e. your ear, face or a case.  This can be tested by playing a voicemail and placing your finger to the left of the earpice... the screen should go dark.
Try removing your case.  If still a problem, it will likely be covered under warranty.

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