One problem you may not have noticed is weather or not you tried to make a call with UMA on your bluetooth. If you do so you call will most likly drop, weather in a Hotspot or in a wifi area. I have tested it with several T-Mobile Curves and they all have the same result. While in UMA no bluetooth will work. I have tried it with three diffrent bluetooth devices from diffrent companies and same result. Sounds like a software glitch