Apple iPhone 6, GSM Unlocked, 16GB - Space Gray (Refurbished) Renewed products look and work like new. These pre-owned products have been inspected and tested by Amazon-qualified suppliers, which typically perform a full diagnostic test and a thorough cleaning process. Packaging and accessories may be generic. This product is backed by the Amazon Renewed 90-day guarantee. Factory unlocked iPhones are GSM models and are ONLY compatible with GSM carriers like AT&T and T-Mobile as well as other GSM networks around the world. They WILL NOT WORK with CDMA carriers like Sprint, Verizon and the likes. The phone requires a nano SIM card (not included in the package).