Ever since we first saw it at CTIA, T-Mobile's been advertising its lovely G2x superphone as a quadband HSPA+ capable device. Based on the published specs in press releases and even on T-Mobile's own website, there wasn't any reason to believe that the G2x wasn't compatible with AT&T's 1900 / 850MHz 3G bands, in addition to supporting T-Mobile's 1700MHz "4G" (AWS) flavor and Europe / Asia's 2100MHz standard. This made perfect sense -- especially in light of AT&T's
