Originally Posted by setspeed
I don't know jack about the different bands used, so answer me this:
If the G2 has the 2100Mhz band then there is nothing stopping me buying and using it in the UK? I'd rather have the 4GB onboard ROM!
See, all T-Mobile phones till now, have the 2100Mhz band. Infact its universal in almost all smartphones..
The only thing that will prevent you from getting the G2, is that it will be locked to T-Mobile. If you're just picking it up without a contract, and you're not an existing T-Mobile customer, I doubt they will unlock it for you.
Other alternatives are getting the unlock codes from eBay, I've done it previously for many BlackBerries and they worked perfectly, but I can't vouch for Android phones.
Or wait for XDA community to come up with a way to unlock it, but I feel that might be a software unlock restricted to that particular baseband AFAIK.
Also, T-Mobile smartphones usually have 2 bands, 1700Mhz(for TMo's 3G) and 2100Mhz for Europe and Rest of World. The Vibrant somehow has 1900, maybe because Samsung didn't bother to remove it or dunno why. But I'm pretty sure the G2 will have 1700 and 2100Mhz bands, I will be shocked if it doesn't.
Alternatively, the Desire Z will not have the 1700Mhz band, but I think it will have 900/1900/2100 Mhz for other parts of the world. AFAIK, Japan and some carriers in Australia uses 1900. Europe as a whole uses 2100.
AT&T smartphones uses 850Mhz band, but in some cities they still have the old 1900Mhz band running.
That list should tell you where all the different bands are used. Note that Japanese carriers use a different type of 1700Mhz band in comparison to T-Mobile USA.