4. Galaxy Note II
Samsung gave way to a new generation of half-tablet, half-smartphone devices with the launch of its Galaxy Note "phablet" last year. In 2012, that popular device got a makeover, in the form of the Galaxy Note II.
The new Note measures 5.5 inches, so it's slightly larger than its predecessor, but it can still easily fit in one hand. It runs the Google's latest Android software, and it also comes with Samsung's S Pen stylus, allowing users to jot down digital notes or doodle directly on the device's display.
These new, souped-up features seem to be paying off for Samsung; the company said in November that Galaxy Note II sales topped five million in just two months.