New 4s connects with bluetooth in my Lexus, but I have intermittent problems with calls. I can hear them, but they can't hear me. Never did this with 3gs. Anyone else have this problem?

Question

New 4s connected to my Lexus bluetooth.  Having intermittent problem with calls.  I can hear them, but they can't hear me.  Never a problem with 3gs phone.  Anyone else having this problem? 

Answer 1

I ended up getting a new phone, straight through Apple.  I called their technical support and went through all he basics again and they decided to replace it.  Was a pretty quick process - after defaulting and resetting the whole phone (about 2 hours),  I called them back to inform that there was no change, so they set up the order.
I had to give my CC# so they could hold a charge on it (in case I didn't send my old phone bach, which they sent me a pre-posted package to send it in anyway).  Had a brand new iPhone 4S in my hands in 4 days, which was pretty decent.  I had uploaded everything previously to iCloud, so setting up the new phone was a snap.
Only thing I really didn't like was they charged me almost 30 bucks for shipping or processing, or something.  Not so sure that should have been my responsibility after spending so much on a brand new product, only to have to have it warrantied after, like, a month.