If you have a large phone, the CD and vent mounts might be a bit weak to hold it. According to our guide to the best car phone mounts, “in our tests, the magnets in all three versions [dash/windshield-, vent-, or CD slot–mounted] were strong, supporting most of our phones either vertically or horizontally over even the roughest terrain. Only the large, 6.7-inch iPhone 15 Plus, iPhone 14 Plus, and Pixel 7 Pro, gave them some trouble when held horizontally, although the mounts were rock solid with a 6.1-inch Pixel 7a.”