My wife's iphone 4s connects to the car bluetooth but handsfree doesn't work.

This used to work fine.  She can make a call by dialing a number on the cars touch screen, but the call only comes through on the phone.
If I connect my 3GS to the car then it works perfectly - sound comes through the speakers and the microphone in the car is active. 
What did she do to turn this off and how can we turn it back on again?
We have tried:
- Unpairing and re-pairing the phone
- Telling the iPhone to forget this device
- Turing off Siri
Any help greatly appreciated.
Thanks!

In the end I tried a full reset (press and hold the top button and front button for about 10 seconds until the Apple logo shows).  Then, after re-pairing, everything was back to how it should be. 
I thought I would post that here in case anyone has the same problem because I didn't find an answer in my searches.

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