ok,for S&Gs,i stuck my t mobile sim into my merge,running nTelos GB. without further mods,calls and texts were working. no data or mms.
i sis a quick search for t mobile APNs,and came across this: Support: Verify the Access Point Name (APN) and internet data connection - T-Mobile myTouch 3G / myTouch 3G Slide / myTouch 4G
i entered the following as a new APN:
T-Mobile Data (or T-Mobile US)
Note: For the Username, enter "None" with the keypad. Do not leave it not set.
Press the Menu key.
saved it,exited back to the home screen,lo and behold,edge data
mms appears to be working as well.
enter the new APN info at: menu softkey/settings/wireless & networks/mobile networks/GSM/UMTS options/acess point names
its had to remember exactly what id tried when messing with this before,but i know for sure its working with nTelos 3.08.557.1 and the above APN. if i have a chance ill try and verify it on some other ruus as well. hope it helps