I'm thinking about getting myself an iphone 4 in Singapore when I go home over xmas. They are unlocked and cheaper than the UK, and with a 'christmas contribution' from my parents I reckon I could afford one. I'm with O2 at the moment but have a normal sim. Can I go and swap my sim for a micro sim? I looked on their site and all I could find was getting a micro sim when you buy the iphone from them. Can anyone shed any light on this?