reply to ssavoy
Given Verizon's tin-can voice quality in my area, I can't imagine it would be 64kbit.
agreed, verizon's call quality really sucked before I left this summer. T-mobile's call quality is a big improvement over Verizon in my experience.
Tmobile uses full rate AMR, which is very good.AT&T on the other hand uses 5.5 kbit/s AMR, which is the worst of any carrier.