Samsung Galaxy Note 2. An even bigger screen shows just how successful the device was. The screen size has increased from 5.3 to 5.5 and to say the device is more powerful would be somewhat of an understatement. The Note 2 features a whopping 1.6 GHz quad-core processor and features Samsung own Exynos 4412 Quad chip. This alone would make it super quick, but add Android 4.1 Jelly Bean to the mix, which the Note 2 will run out of the box, and you have the fastest device on the market.