After a day struggling with not having uma finally what was wrong. When I restored the back up file from my 8100 to my 8320, I did a full restore. I call BB tech support from T-Mo and he told me to do a selective restore that exclude the Handheld restore key and Trusted Restore key. I finally got uma . I'm sure this method has been mentioned somewhere in our forum but I didn't see it.
The uma I got, however was only in lower case. What is going on here, where's my UMA? So I called tech support again and she suggested me taking out the battery which set the Curve back to edge. Then I try everything like doing a hard resetting and register to the Host Routing Table. Nothings seem to work and I'm still on edge. So I decide to do a restore again. Bang! There's the uma.
At least I got something now but I'm still not satified yet. I will try to connect at different wireless network tomorrow to see if I can get UMA.
Meanwhile, fellow BB friends, any suggestion?