All of the US 3G carriers use different radio bands than the europeans do. I believe AT&T uses 1900, but I am not completely sure. What I do know, however, is the two bands aren't compatible, and that no US carrier uses Euro bands (Maybe because of the FCC?).
In an Cnet video about the Motorola Rizr Z10, the guy says that it will not work on 3G networks in the United States because it uses European 3G bounce. I have no idea what this means. What is the difference between the US and Europe's 3G networks? I know the phone supports HSDPA 2100......do no US carriers support this? T-Mobile? I have searched googled every search combo I can think of but cannot find helpful information on this topic.
Bottom line is that I wan to get this phone with T-Mobile [there is a t-mobile booth here that sells unlocked phones WITH the discount with new service, and says that he can get me the Z10 in a few weeks. I just want to know if it will still support T-Mobiles 3G, as well as other US features.
It is Quad-Band, so that isn't a problem.