This is a question for UK people only, as it's carrier specific. I've pre-ordered the new iPad with 4G/3G, and I know that I want to get a monthly contract with Three for when I go off to uni next year (I'd probably take out the contract in May/June this year). The reason I don't want to take out a contract now is that I'll be using my iPad at home 95% of the time where I have Wifi, so don't need the mobile internet for now. I don't want to pay £10 a month when I'm not using it. However, there might be the odd day or two where I go away either on holiday or just travelling that I would like to take my iPad with me so I can use it. My question is this: if I get a free sim from O2, pay their daily rate for mobile broadband the odd time I'm away from home, will I then when the time comes be able to switch to my monthly contract plan at Three without any problems? I don't want my iPad to be tied down to O2 if I at first register with them. I want to be able to use it later with a different SIM and carrier. I think I will be able to do this, but I'm just checking. And also how would it work with registration, as surely you would have to register you iPad to one carrier? Would I be able to deregister it with O2 and then reregister it with Three? Any help appreciated.