The XT531 will be capable of UMTS connections on bands II and V, corresponding to the 1900MHz and 850MHz bands used for 3G/4G service by AT&T. It's doubtful this is the Fire XT, even if the FCC didn't evaluate the 2100MHz band, because we've heard the phone will only have dual-band HSDPA. It's possible we could be looking at the Spice XT, ready for a carrier like Mexico's Telcel, which operates on the appropriate bands. Another possibility is that this is an entirely new XT531 variant, one that's specifically planned for release in the US or Canada. We haven't heard anything from Motorola that might support that theory, but this phone's definitely one that's working on establishing a global footprint.
Source: FCC
