It can be basically illegal anywhere you drive to hold on to your phone and drive, so your best bet is to have a great magnetic phone support.
But certain mounts may be pretty tedious, and a great permanent magnet mount makes life much better when you're getting in and out of your car. Oliv are the top magnetic car mounts for the phone!
These are the top magnetic car mounts on your iPhone. They'll keep your phone out of your hands while you're operating (and hopefully prevent a ticket), and they'll let you check directions and more on the run.