I have a UK Nokia 6500 slide which has
GSM 850 / 900 / 1800 / 1900
UMTS 850 / 2100
I will be visiting NY, Washington, Virginia, Maryland. I want to tether a laptop: I'm only interested in data. I am considering getting an AT&T SIM. I read that they use UMTS 850/1900 and I read that their coverage is better than T-mobile.
Is UMTS 850 available everywhere that there is AT&T 3G coverage? If not will I be OK with just UMTS 850 and not UMTS 1900?
Any recommendation for an AT&T SIM? Perhaps the one mentioned here
if it's still available.