Ok, so I am going to be studying abroad next fall and was wanting to bring my iPhone 4 to use. I went to italy a few months ago for a little over a week and brought my iPhone to use solely as a camera. It worked great. I didn't get any cell service anywhere for some reason, but I wasn't really trying to use my phone so it didn't bother me. Airplane mode worked great. But now I'm going to be living in London for 10 weeks and traveling around Europe (probably Paris, Ireland, Amsterdam, etc). I'm going to have to buy a phone as everyone in our program is required to have one, but my friend who lived in London last fall said there are shops you can take your iPhone and they will put a european sim card and make it work? I've never jailbroken my phone and don't know how, or is that something they would do? Also, I know the iPhone 4 uses micro-sim cards, so I'm not sure what to do there. Also, since I will have a new phone number and everything, is there a way to keep all my US contacts separate so that after I get back from London I can just sync up my phone and restore all my US phone numbers back to my address book?