Apple iPhone 4 8 GB Unlocked GSM , Black (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, replacement of any defective parts, and a thorough cleaning process. Wireless devices have batteries tested to have at least 80% capacity relative to new at the time of sale. Packaging, wall plug and charging cable may be generic (headphones not included). Wireless products on Amazon Renewed come with the 90 day Amazon Renewed Guarantee. GSM Factory Unlocked: Device is unlocked for use on any GSM network, please contact your service provider prior to purchasing to ensure full compatibility. GSM providers include AT&T & T-Mobile. Not compatible with Sprint or Verizon Display: 3.5 inches LED-backlit IPS LCD, capacitive touchscreen, 16M colors GSM 850 / 900 / 1800 / 1900; HSDPA 850 / 900 / 1900 / 2100 iOS 4, upgradable to iOS 7.1.1, Micro-SIM, 5MP camera, Video: 720p@30fps, WiFi, Bluetooth