The Proximity sensor don't work properly of ios4

hello! ive just update to ios 4 on my 3gs, and the problem is that the Proximity sensor don't work properly, when I put the iPhone near my ear it turns off the screen, but when I move it back from my ear it doesn't turn on...
i tried to restore, and at first the problem was gone, and now it's back...
is it a bug? I'm pretty sure my sensors are fine..
tnx!

I was having the same issue with my new iphone 4 with screen going dark when I lowered it during a call & not having access to the call or controls of the phone. I discovered the problem was the 3G case I was using on my iphone 4 (it happens to fit pretty well). When I removed the case the proximity sensor now seems to function properly. The 3G case must have been interfering with the sensor. I guess I'll be getting a new case. Hope this helps.

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