Still a question about the different phones

Because I’m already so nice to research and have received good answers to my seat threat: There is a 9-3 option to order an integrated phone, or to attach the phone to the center console afterwards. With my last two Saabs I had that, was actually enough and had the advantage that I didn’t always have to turn off the phone and even got it loaded. I also don’t necessarily need voice control etc. The question is now r (and my dealer can’t answer this satisfactorily): is this subsequent installation with the new 9-3 what? Is the phone also controllable via the buttons of the “big” Navi, which I also want to do? Can one take calls then possibly also via the steering wheel? Or is such a constellation rather gifted and actually Murks? Unfortunately there is no equipment package, which my preferences 100%-y. Thanks to unbd greetings from the Pott, jogg