My BH2 has odd problems on voice calls too. At first I just assumed it was T-Mobile since they have a bad reputation for that, but I popped my SIM into my unlocked AT&T Tilt and it works great.
Specifically, mine has this weird thing where the volume at the start of a sentence after a pause (even a short one) ramps up to normal, making the first word or so difficult to hear sometimes. Seems like there might be some software option that's trying to normalize the volume or something and doing a poor job, but I couldn't find an option anywhere. The voice also cuts out sometimes, which I haven't heard on my Tilt (though I haven't used it that much).
If there were other radio ROMS available, I'd give those a try, but I don't know of any. I'm hoping the bugfix will fix it, because it is annoying.
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