I've been able to pair two phones to my car but when both my wife and I are in the car the Bluetooth can only access and use one phone at a time.
Is there something wrong with my Bluetooth?

Thanks in advance!

if you mean access via iDrive one phone at a time, I believe that is correct. I do not think you can access both phone books simultaneously via iDrive and/or obviously both be connected via BT to 2 different calls at the same time....

BT (currently) cannot pair two devices simultaneously .... The first phone recognized / detected will be the one paired - unless, of course, you turn off BT on the phone. I think in iDrive you can also disconnect one phone and select which phone you want to pair with the car.