Business in the front, party in the back. That could be the LG G2's catchphrase, because all of this Android phone's physical buttons are on its back. That isn't the only way this flagship ($99 down, $21 per month on T-Mobile) seeks stands out from the Galaxy S4 and HTC One. A very fast Snapdragon 800 processor -- a first for U.S. phones -- enables all sorts of multitasking goodness. Add in a 13-MP camera with optical image stabilization, to boot. But will the G2 win over enough shoppers?