Current Blackberries utilize GPRS, but not Edge correct? Does anyone know how extensive GPRS is on T-mobile's network, especially in main metropolitan cities like Miami, San Francisco, New York City, D.C., etc? thanks!
GPRS in most instances is 'up to 56k' dependant on a number of factors including signal strength. My blackberry has worked in all the cities you've mentioned even though it is a UK one as my mobile operator has roaming agreements in most countries worlwide. Not sure specifically for T-Mobile but you may find if you go to other ities it can roam if you have no coverage for your own provider. Basically the device has the capability to use any blackberry enabled carriers gprs network but it's down to a commercial agreement between operators as to whether your device will be allowed on their network. Easiest way is to do a network search on the device and see if any others let you on.
I understand this, but do BB's utilize GPRS or they can't go voer 56k?
P.S. Is there some kind of GPRS or Edge coverage map for T-Mobile?
EDGE will be available on areas which has a lot of data traffic going, it won't be everywhere. So basically it's area specific. As of right now, the only way to know if you have data/voice coverage in your area would be if you go to http://compasss.t-mobile.com. EDGE will be out pretty soon.