I have a terrible Orange signal at home, and thought UMA would solve my problem. It took a while for the handset and router to 'learn' they could do this (as I've been told), but UMA started popping up on my h/s two or three days after I first got my BB. Unfortunately, even if I have 'wifi preferred' under mobile network settings, I can stand OVER my router and it will still jump back to a GPRS signal with one bar whenever it wants to. It also likes to switch whenever I try and make a call on UMA, which inevitably drops the call. Good in theory, but doesn't really work well for me.
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