AT&T if you dont care about crappy service. i use verizon and wouldnt switch because i have unlimited data.
Get AT&T. It's the only carrier with true HSPA+ speeds, which means the full 14.4 Mbps. The other carriers are limited to 7.2 or so Mbps.
WRONG WRONG WRONG.
"Apple demonstrated fast new 14.4 Mbps data downloads that technically put the new iPhone 4S in the realm of 4G LTE competitors, but US residents won't benefit much from the increased potential because domestic carriers don't support it."
However the iPhone on AT&T will most likely be 3X faster than Verizon or Sprint whether or not it's HSPA +
WRONG WRONG WRONG.
"Apple demonstrated fast new 14.4 Mbps data downloads that technically put the new iPhone 4S in the realm of 4G LTE competitors, but US residents won't benefit much from the increased potential because domestic carriers don't support it."
Get AT&T. It's the only carrier with true HSPA+ speeds, which means the full 14.4 Mbps. The other carriers are limited to 7.2 or so Mbps.
If those other carriers you are referring to are Sprint or VZW, then they are limited to 3.1 Mb/s