3G network coverage
While both AT&T and T-Mobile have GSM 3G data networks, AT&T has a definite edge in terms of range of coverage. In May, AT&T announced that it had finished deploying its 3G HSPA network that would deliver downlink speeds of 1.7Mbps to 350 U.S. markets by the end of the year. T-Mobile, in contrast, only started rolling out its 3G UMTS coverage this spring, and the carrier estimates that it will have 3G service available in between 20-30 markets by the end of the year. Both devices also support Wi-Fi connections.