I have owned six car phone mounts in five years. Three fell off the windshield on hot days. One melted its suction cup entirely — I found it dangling by the charging cable in a July parking lot. Another clamped onto the air vent so aggressively it broke the vent slat. The last one — the one I still use — cost $15 and has not budged in 18 months.

The difference between a phone mount that stays and one that does not is where you attach it and how it grips. After my trial-and-error tour of the phone mount industry, here is what I learned.

Windshield Suction Mounts: Skip Them

Suction cups fail for two reasons: heat and dust. Direct sun through the windshield heats the cup and the air inside expands, breaking the seal. Dust on the glass prevents a clean seal from forming in the first place. Some high-end suction mounts use sticky gel pads that resist heat better (iOttie is the brand to beat here), but even those eventually let go. Every windshield mount I have owned failed within six months. Every single one.

The Dashboard Adhesive Pad Mount (The Winner)

A flat adhesive pad stuck directly to the dashboard with 3M VHB tape holds far better than any suction cup. VHB is the same tape used to attach trim pieces to cars at the factory — it does not melt, and it only comes off with deliberate effort. The mount I settled on is the Scosche MagicMount — a small magnetic disc on an adjustable arm. The metal plate slips inside your phone case (invisible) and the magnet holds the phone firmly even over potholes. $15. I have taken it through a Texas summer and a Minnesota winter and it has not moved.

Air Vent Mounts: Convenient but Fragile

Vent mounts clip onto the slats of your air vent — convenient because they are at eye level and easy to reach, but fragile because vent slats were not designed to hold weight. On older cars with sturdy metal vents, they work fine. On newer cars with thin plastic slats, the mount will either fall off or break the slat. If you go this route, get a hook-style clip that wraps behind the slat instead of just pinching from the front. The WizGear vent mount with a hook clip is one of the few that has decent reviews for longevity. Still, I would not trust one with a large phone like an iPhone Pro Max.

CD Slot Mounts: The Underdog

If your car has a CD player you never use, a CD slot mount slides into the disc slot and locks in place. It is more stable than a vent mount and does not block airflow. The downside is it sits low — near your shifter — which means looking down at navigation instead of straight ahead. I tried one for a week and went back to my dash mount because the lower position felt less safe, not more. But if your CD slot is at dash level (some cars mount them higher), this is a solid, vibration-free option.

Magnetic vs. Clamp: Magnetic Wins for Daily Use

Clamp mounts (the kind with arms that squeeze the sides of your phone) feel more secure but are annoying to use every single time you get in the car. You have to squeeze, position, release — it is a two-hand operation. Magnetic mounts are one-hand: you just place the phone near the mount and it snaps into place. The only downside is that magnetic mounts require a metal plate between your phone and its case, which may interfere with wireless charging. If you wireless-charge in the car, get a mount with a cutout for the charging coil — Scosche makes one specifically for MagSafe iPhones.