Screen goes blank while using phone

If this happens with your 3G, I bet it's because it's in a case you purchased for the old model. Take it out of the case and see if it works.

Do you use a case or sleeve on your iPhone? If the case blocks the proximity sensor(s), the phone may still think you are holding it next to your face and black out the display so you don't disconnect or do something else unintended "by cheek."
I had this problem too and fixed it by modifying the el cheapo holster case with a razor blade - works fine now. Depending on which iPhone model you have, there will be one or two proximity sensors to the left or right of the earpiece speaker at the top of the phone. Make sure this area is clear, and you should be fine. This also fixes any problems people are having with random screen bright/dark changes since the light sensor is located in the same area.

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