Iphone 3g blank screen during calls

I bought a 3g last week to replace an original iphone that had stopped working. Everything seemed to work on the new phone except that during calls the screen would go blank and I could not get it back by holding it away from my ear, hitting the Home button, or anything else except the on/off button at the top, which ended the call. I was on the phone with apple tech support for several hours, trying all sorts of things that didn't solve the problem.
Then my grandson came home and looked at my phone. He surmised that the case, which I had transferred from my original iphone, was blocking the sensors. This turned out to be correct. If I push the phone slightly out of the case when on a call, the screen works just fine.
I decided to post this in case some one else runs into the same problem.

As soon as you said that the screen didn't come on, my first question was going to be are you using the original iPhone case? The proximity sensors on the 3G are positioned a little differently than the original phone.

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