I use AT&T (Cingular) and haven't had any problems. If you're curious about how HTC hardware performs on their network, you could always pick up a Tilt and give it a whirl. You have two weeks to return the phone (I think), but since it's an HTC product it would give you an idea of the call quality. Personally, I haven't had any problems with the P3300, which replaced a Moto MPx220 and imate SP3i that I'd been using previously (the Moto was cr@p, but the imate was fine).
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I use AT&T (Cingular) and haven't had any problems. If you're curious about how HTC hardware performs on their network, you could always pick up a Tilt and give it a whirl. You have two weeks to return the phone (I think), but since it's an HTC product it would give you an idea of the call quality. Personally, I haven't had any problems with the P3300, which replaced a Moto MPx220 and imate SP3i that I'd been using previously (the Moto was cr@p, but the imate was fine).