My friends phone wouldn't turn on when on battery so we took it to the store and they ran the battery test and looked for water damage and they go everything looks good, we'll give you a replacement. Then they take off the back to get the serial number, which I didn't even know was back there, and see that the battery connector popped out. How I don't know but they said it was missing a screw. So he took in into the back and came out and said I don't have any of those screws and he went in the drawer to get a replacement iPhone and then took that apart to get the screw instead of just giving us the new one. They ruined a new iPhone just for a screw. I couldn't believe it.