If u look at the two phones coming out for tmobile: v171 and the samsung e335 they both operate on the 800/1900 band...in my area 1900 band cannot find signals...and the 800 as stated by the phonescoop link is the same thing as 850 which means maybe tmobile is trying to buy roaming agreements from cingular...b/c how else would this phone find service in my area...right now my v300 uses the 900 band? who knows