Review on 📱 Ultimate Phone Card Holder: RFID Wallet Credit Adhesive Cell Case Stick-on Card Holder for Most Smartphones by Andrew Dickens

Update: You're still holding on, but getting the cards is now easier! As I just received I will update after a little use. The adhesion seems to be very good. Maybe the card slots will loosen up a millimeter or two after a little use! It is not easy to put 2 cards into slots. I finally accomplished this feat after taking a sturdy comb handle and working a little on each slit. They're still holding on, but can now get one in either slot. The cards are still held tight enough that they don't fall out.