So ... I got a new 8120 the other day, and to be honest... I LOVE IT ... BUT...
The first time I configured network on the wifi menu, it showed "UMA" in large and I made a call while on it and it was ... well it wasn't great but it was free...so ok...
Ever since then... that connection went out that nite, and I configured new ones on it, and I have even connected to that connection at my friend's house AGAIN... and i have yet to see "UMA" come up again- EVER!