Find your iPhone model: Look for the 'A' model number on the back or in the Settings app to determine which iPhone version you have. 'A' model number location: Pre-2017 iPhones have the 'A' number ...

Find your iPhone's model number in the Settings app. If it starts with an F, it was refurbished by Apple or a carrier. Refurbished iPhones from Apple are cleaned, fitted with working parts ...