My favorite car phone mount so far is the $7 Spigen Magnetic Air Vent Mount

We recently got a new car, and I opted not to get the built-in car navigation. It's never as good as Waze, Google maps, or iPhones. It's a waste of money. My wife is the primary driver of the car and she hasn't been happy with any of the phone mounts she tried. So on the weekend I got the Spigen Air Vent Magnetic Car Mount Holder for $7 on Amazon and I think it is going to do the trick. I like it so much I bought another one for our other car. The mount attaches to the car's air vent and has a strong neodymium magnet in it. The kit comes with two very thin metal plates (0.013 inches thick according to my digital caliper) with adhesive so you can stick them on the back of your phone or the case. The phone feels secure when you put in on the mount. I like this much more than the springy pinchers my other phone mounts use. At $7, this was a great deal.