I had VZ for years and never had any issues with them at all. I bought a 8310 from ATT back in December because that was the phone I wanted. Until 2 weeks ago it worked fine but I do notice that call clarity isn't as good and maybe that's because everybody I know is still on VZ and CDMA to GSM calls have never been really all that great. In any event, over the past two weeks I am suddenly experiencing a rash of dropped calls and I have no idea why. I even called ATT and they reset my phone on the network. So far it hasn't helped. They offered to replace it but I don't really think the phone is the issue here.