I will be trading in my iPhone 7 128GB when the new iPhone comes out. The trade-in companies don't knock off any money from the trade-in value for general wear & tear, but I was wondering whether a very small amount of paint coming off the bottom of my iPhone is covered under wear & tear or not? If not, then how much money could I expect to lose from the trade-in value? At the moment, I can get £350 for it from various companies like O2, CPW and Vodafone. I am expecting to lose a maximum of £50 due to the chipping. Anyone with experience with trading in iPhones?