Hi there, currently an iPhone 4 user but on the verge (maybe tomorrow!) of buying a Galaxy S2 (or possibly a HTC Sensation). My question is, a friend showed my his old HTC today and told me how much could be customized (lock screen, icons, themes etc). It appears the Galaxy comes with Samsungs own UI overlay - how changeable is this? Is it the same as HTC? Keep in mind I know very little at the moment about Android!