The Samsung Galaxy S2 I9100 is the much anticipated successor to the hugely successful Galaxy S I9000. The S2 runs Android 2.3 Gingerbread OS which brings in quite a few useful upgrades over the Froyo, including an improved copy/paste function, revamped App Manger and more spaced-out keyboard. Samsung has overlayed the stock Android interface with its TouchWiz 4.0 UI that brings in 3 new hubs and a few aesthetic enhancements.