My iphone 4s could not pair to more than 1 bluetooth device. In my lexus, I have to pair iphone4s to either phone or radio but not both. The technician at Apple has tested the device and confirmed the problem. Any suggestion or help?

My iphone4s cannot pair to more than one bluetooth device at the same time. As a result, I am unable to pair the phone and the radio in my car: it is one or the other. It is like going backward, I used to do it with my iphone 3G. This problem is tested and confirmed by the technician at the apple store but he could not solve the problem and did not even put it on the record for apple to consider.

Any one with a suggestion as to how to solve this problem? I have the IOS6.1 on the iphone 4s