I have problems with UMA that I'll get dropped calls all the time over UMA while Im at home. Ive done the tutorials about opening ports and all that, but still no improvement. I was wondering if there was a way I can use WiFi for internet use, but have all my calls use EDGE?
Did you try going to Manage Connections > Mobile Network Options > Connection Preferences and putting Mobile Network Preferred?
Also, about the dropped calls, under Manage Connections go to Wi-Fi Options and edit the connection you're having problems with and ALLOW inter-access point handover.