This smartphone from Apple is certified refurbished which means cheap price and looks and acts like new. It's a chance to get great deal on an Apple iPhone. You may need one for family member or want a second one for various reasons. This is a great price, a fraction of the cost of a new iphone.
On the downside, the 16GB can not be expanded. This is ok for many. If you don't need a phone to store dozens of videos or graphic intense games, this should still be ok. 16GB is still alot of GB of storage.
The phone is a GSM model and it will only work with GSM carriers like AT&T, T-Mobile or other GSM networks.
iOS 7 is the operating system and has many of the latest apps and features of Apple's current iPhone like Facetime, which allows video calling with other Facetime users, facial detection and more. It is upgradeable to iOS 8 if necessary.
Overall it's a great product at a great price.
4.0-inch touchscreen display with a resolution of 640 pixels by 1136 pixels at a PPI of 326 pixels per inch. 1.3GHz dual-core Apple A7 (64-bit ARMv8) processor 8-megapixel primary camera on the rear and a 1.2-megapixel front shooter for selfies. 16GB of internal storage cannot be expanded. Includes A/C Adapter & Lightning Cable