Good thing I bought a pair, instead of just one , because one is not going to do it!...I have an IPhone 8 with an outer box. At first I went just with one and it moved around and eventually fell and I was still parked...so I knew I had to use both of them to balance the weight.
This is the best product for holding the phones in place in the car. My phone is extra robust Samsung Gakaxy S8 Active si it big, bulky and case is textured. Other companies magnets wont stick to it. Only diwn side is doesn't seem you can buy just the magnet. I had to change phones under warranty so had to buy product again. So I found clipped it to a cable and magnet to shelf bracket in house.
Love it.. Georgia just passed hands free law for cellphones. Only reason I didn’t give 5 stars is because my phone is already in a magnetic case. I’m not sure how well I would have liked applying the magnet that was supplied.