HTC Dash 3G / Snap (GSM)
T-Mobile and HTC both deny any awareness of a problem with the device. I think this will change as more people realize that the dropped calls are inconsistent and can't be simply poor service area or loaded network.
I have been with T-Mobile now for 4 years and 6 out of the last 7 years. This is not a network problem, but a problem with this phone. Stay away.
Shop for accessories specifically compatible with the HTC Dash 3G / Snap (GSM).