11 Great Smartphones for $50 or Less's mobile master found 11 of this year's hottest smartphones, including new Android, BlackBerry and Windows Phone 7 devices on all major U.S. wireless carriers -- even Apple's iPhone 4 on AT&T! -- for less than $50 each. Whatever your device- or carrier-preference, we've got a can't-miss smartphone deal for you. (Note: The following deals may not be available in all areas, and details may change.)