I bought an Anker Air Vent Magnetic Car Mount from Amazon.com. It works well with an iPhone 6s Plus and iPhone 7 Plus. I have only been using it for one day, so there is no need to pretend to know a lot about this product yet.
I prefer using the turn-by-turn direction on the phone than the built-in car navigation system. Mounting the phone by the air vent certainly is certainly better than mounting it on the windshield.
