Hi I am looking to stick it to *AT&T* by purchasing an iPhone in the U.S., unlocking it, and then using European SIM cards while I am traveling in Europe. I would appreciate any advice as to the feasibility of this. 1. One major question is can I buy a new iPhone 3G or 3GS (without contract) and know for sure that it is unlockable? Do bootrom and baseband updates render only the newer 3GS "locked" or would a new 3G also be "locked"? 2. European users: Is it possible to purchase prepaid sim cards in each country and still have full iPhone functionality, or would it be best to sign up for a single carrier in England or Germany (etc...), and stick with them throughout the trip? Are international rates for European carriers applied differently throughout the EU? I am probably going to be in Europe for three to four months, traveling broadly. 3. American users: How costly is operating in Europe with AT&T? I have heard horror stories of enormous bills. Does neutering the phone (i.e. no internet connection other than free Wifi) present a problem? Are international phone rates horrific? I am planning on being abroad for six months and trying to come up with the best way to stay connected. Any help much appreciated.