My 8320 has no more UMA after upgrading to 4.2.2.180
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I called tmo and they said "due to a network prob in ca & nv"
I'll try again in the morning and see, as soon as I finished upgrading the OS I get wifi but no UMA, only EDGE. Before the upgrde everything worked great.
Odd that a network problem would affect internet only traffic over wifi. The towers aren't even needed to establish a UMA connection.
Have you tried shutting the cellular radio off and just using the wifi connection to see if it works that way? Also you may goto the blackberry homepage on your BB itself to make sure your t-mobile certificates for UMA use are still installed.