Got my Samsung Galaxy S3 this morning and i must say i am extremely impressed and you will never get bored with the packed full features, The touchscreen is highly responsive which means you don't get any lag when surfing the internet even on 3g!
However, i didn't realise when i bought the phone so i thought i'd point it out to prevent any others from making the same mistakes. The phone is unlocked to any network which is a bonus, but the phone does not use the old style SIM card and instead you need to request one from the network provider, The phone only takes a Nano SIM. I contacted O2 and they said that they could give me one free of charge and i can still keep my number and bolt on tarriff. So not too much trouble.