i dont have t-mo coverage at my house and have used UMA for well over a year on my old 8320 and my new 8900, both work perfectly and i have never had issues, UNTIL NOW! My motorola H15 headset i just bought has issues with my 8900 when i am using UMA, i even thought the original headset was defective so i bought another and it has the same issue. i have this issue with both the shipping 8900 software and the current release for the 8900. It works fine with my old motorola H700 though but that has no noise cancellation so i cant use that in most environments. hopefully this gets fixed in a future software update for the 8900.
my bb History = 7200, 8700, 7100i, 8320, 9530, back to the 8320, 8900, 9700, 9930, PlayBook