Blank screen while making calls

hi! im getting blank screen when im making a call,i have checked if its a problem with the proximity sensor but its not.
the screen just goes blank when i hit the call button and i can do nothing for example to end the call or etc.. all i can do to get the screen activated is by pressing the power button but by the time the call is disconnected..hmm ..anyone with the same problem????

This really bad if you can't put the iPhone 3G in a case. What was Apple thinking? They need to explain what the impact is that these sensors have on use of the iPhone so that users can actually use the device to make a phone call.

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