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Technically the store personnel can install an accessory on a phone for you with your permission it's not something they have to do. I'm sure what the rep meant was that if it came off they would apply another one for you. Accessories carry no warranty inside the store and are always referred back to the manufacturer. It is up to the manufacturer at that point to decide whether or not a screen protector peeling off is the result of bad manufacturing with adhesive or design or a fault with some other accessories like a case or cover.