Man, the loot you can uncover when you go snooping around spec pages. That most ambitious of Sony Ericsson projects, the XPERIA X10, is still a long way from being released, but already we can narrow down the list of potential US carriers to just one: AT&T. The guys over at Phandroid were the first to spot the newly added UMTS frequency specs for the phone, and the available 800/850/1900/2100 bands fit only AT&T's 3G n
