I currently have a UK based (I live in the UK) 3G on a monthly contract with O2 which includes 500 free minutes, 600 free texts and unlimited data. If I buy an iPhone 4.0, I assume I will simply be able to transfer the SIM (once I have a replacement Mini SIM from O2) in the new phone and still keep my existing (unlimited data) contract. Yes? Or have I missed something. c.