Peel off the cover of the sticker and stick to your phone back, and finish by softly pressing. Replace your wallet with a phone pocket,easily holding your ID Card,Credit Cards,Pouch Card,etc. High quality strong adhesive on back of your cell phone,but no sticky residue when removed. Widely used for computer back,glass,car window,car dash, refrigerator door or home front door. Phone card holder compatible with iPhone,Samsung Galaxy,and all most smartphones. ?Note - iPhone 11/X/8/8+ has an anti-fingerprint coating on the back of these devices that doesn't allow adhesive so we recommend a case with these phone models.