Go into settings menu on idrive. Then communications. Go into Bluetooth and make sure the box is checked and blutooth is on. Now go into the other menu for the phone and it should read something like devices discoverable in this menu. Turn on phone Bluetooth, and pair with your phone. It will ask for a code but make one up but make sure you mirror that code when idrive asks for it.
If the phone has not been paired the telephone button on the wheel will do nothing.