When I get a call, if I pick up the call or call out with the steering Control, Bluetoth works. If I use my Nokia Lumia phone to pick up, the Bluetooth in car does not work.. Anyone know why?

 

On some phones this is just how it works. I see it as a benefit, if you use the phone to pick up you can have a conversation without any other person in the car hearing everything (if its legal to talk on the phone in your state, of course). Or you can just use the steering control to answer if you don't mind anyone else in the car hearing

On the other hand, it could just be a compatibility issue or an unchecked setting on your phone.