i have been an at&t - cingular - back to at&t customer since forever...i have never had problems with it. none, from customer service to call quality. i have 5 lines in my account and they are all good. there is only one small area which i always have intermitten signal is annandale rd. between rt 236 and rt 50. other than that, its good from here to florida, to texas, to california to seattle and back home.