Review on Polifall Cell Phone Card Holder Stick On Wallet Sleeve Back - Dual Pocket + Finger Grip 📱 Strap Loop + Metal Plate for Magnetic Mount + RFID Blocking for iPhone, Galaxy, Android, Mobile Devices - Black by Charles Purnell

The best I can say about it is that it sticks to the phone case very well. All in all it's a failure. Sounds like a good idea but believe me it's a disappointment. First, the metal plate sits too low because of the hidden pocket. All phones I know have camera lenses on the back, and unless you want your credit cards to block that, you should set them low. This makes the top of the phone heavy and it falls off the magnetic mount in my car every time I turn a corner, rendering this feature unusable. Second, the elastic finger holder is so loose that it literally dangles. It makes no sense and does nothing to hold the phone. I think if you want it to just store your maps you can buy a cheaper one just for that. Just bad design.