These phones are checked for defects and cosmetic damage and are reset to a factory default status. Refurbished phones may even come with an offer of a limited warranty against defects to encourage confidence in buyers who might be hesitant about buying a refurbished product.

A good refurbished or used iPhone deal will include all of the accessories and a warranty, just like if you bought new. There's really nothing to lose as long as you've done the research before buying to be sure you're using a reputable seller.