Until January, I'd been a long-time (over 5 years) Sprint customer. I switched to ATT because I wanted the Sony T68i phone, primarily because of its bluetooth capabilities. Overall, I've been pretty happy with it, but I liked the 1xRTT network better than I like the GPRS network. The speed was better and coverage seemed better. Yesterday, Sprint announced that they'll support the new T608 phone. I really like the T68i phone and ATT has been a reliable carrier, so I don't think I'll switch, but if Sprint had had this phone four months ago, I'd still be with Sprint.