While there hasn’t been any official word as to which US carrier will be picking up the Sony Ericsson XPERIA X10 just yet, but the fact that it will only be available in the 800/850/1900/2100MHz 3G bands means that AT&T seems like the only possible candidate. Aside from the carrier, if MobileCityOnline is to be believed, this highly anticipated iPhone rival could be going for $999.99, which is a “discounted” pre-order price over the standard price of $1,299.99 for the unlocked version. Of course, if AT&T does decide to pick up the phone, it’ll certainly be cheaper with a contract.