Motorola KRZR K1

I purchased two unlocked KRZR K1's for use with T-Mobile...a cosmic blue (U.S.) version and a black (Asian--I think) version. Both phones seem to work fine with T-Mo, but when I send an MMS or attempt to use the web browser, the blue phone says "Edge Active" while the black phone says "GPRS Active". WTF? Both phones display the "E" symbol on the home screen indicating they're near an Edge enabled tower.

I'm wondering why one phone says Edge active and the other one says GPRS active. Is the Asian K1 Black not enabled for Edge? Neither T-Mobile nor Motorola had any idea what I was talking about!!