Much of the USA is 850 MHz, so a phone without it is pretty limited when traveling. The 2100 MHz and similar bands are for data (and are different between the USA and the rest of the world, of course) and are usually considered separately. [link|http://en.wikipedia.org/wiki/CDMA2000|CDMA2000] versus [link|http://en.wikipedia.org/wiki/W-CDMA|W-CDMA], versus [link|http://en.wikipedia.org/wiki/Universal_Mobile_Telecommunications_System|UMTS], etc., etc. Alphabet Soup!!! :-/
It looks like a nice phone though, and it's something to think about. Thanks for the pointer.
Cheers,
Scott.
(Who is still leaning toward the [link|http://europe.nokia.com/products/phones/E61/E61-specifications|Nolia E61] but who hasn't looked enough at the recent [link|http://www.rim.net/products/handhelds/index.shtml|Blackberry] offerings...)