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
