[aiharkness]

PoddyMcQ makes a good point. On a home wifi network, you may not notice it, unless you have other users consuming all the bandwidth. But in hotspots -- hotels can be bad about this -- wifi signal will ebb and flow, or too many users will suck up all the bandwidth. In that case, even if you had UMA, the BlackBerry is going to find a connection where it can find it, and drop the data onto the mobile network until the wifi comes back.