By most accounts, the HTC One is the most compelling Android smartphone on the market today, but only three of the major US carriers are wise enough to sell it. Up until this point, we've put the AT&T and Sprint models through their paces, and now we have an opportunity to round out the trio with T-Mobile's version. Given the carrier's recent shift to an unsubsidized pricing model -- which brings lower monthly fees in exchange for purchasing your phone outright -- you
