Few of us who live outside of Asia or Eastern Europe know the potential convenience of a dual SIM phone. Own one and you can globetrot, or else keep separate home and work lines without the bulk of an extra device in the pocket. Sony is gambling that enough Americans have that multi-line desire by selling the Xperia tipo dual and its regular, single-SIM counterpart in the US as unlocked GSM models. Neither of the Android 4.0 phones is what we'd call a powerhouse with the same 3.5-inch screen, 3.2-megapixel camera and 800MHz Snapdragon inside, but both can latch on to HSPA 3G on AT&T, refarmed T-Mobile coverage and 2100MHz carriers abroad, even if the single-SIM tipo curiously has 900MHz 3G support that the tipo dual lacks. It's undoubtedly price that Sony is counting on more than anything: at respective contract-free prices of $180 and $190 for the tipo and tipo dual, the pair of Xperias may be sold most often as travel-only phones for the jet set.