Strangely enough I had to do a master reset last night in an attempt to take care of some quirky MFT behavior post-3.5.1 install. I had to stop at the grocery store on the way home tonight. I was goofing around with some settings on my iPhone and MFT before I drove home from the store, specifcally related to text messages. I called home to make my wife or son (whoever the unlucky one was that answered the phone) send me a text message to test it out (sort of worked BTW, I can receive text messages and even have the sync-lady read them to me but I still can't send, gotta keep digging I guess).
Anyhow, the call was crystal freakin' clear. I was shocked. It was like it was, if not better than it was, w/2.11. I kept asking my son if he could hear me. I didn't hear any noise on my end and was suspicious. He said he could hear me fine. Wow! Keep in mind this was a call from my car to a landline and I was only doing about 45mph on a smooth road but my calls have sounded terrible even under those conditions post-3.0.2. Crazy good quality. I still have to test more, call on rougher roads, call cell-to-cell, etc. but that was GREAT! Oh yeah, and the text messaging thing with iPhone worked, at least for receiving messages.
.......here's a lockpick. It might come in handy if you, the master of unlocking, take it with you.