You said, when you turn the phone on it says "no service". Do you mean the AT&T logo shows up on the top of the screen, but you have no service bars and the words "Emergency" or do you mean the sim card is not recognized? Some of these p168's won't accept a 3g sim card if you have one. They also are not all quadband, so if you live in the country and use AT&T, you're sol.
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remember the ultimate answer is "42"