AT&T Certified Restored: May be previously opened or used devices that undergo a series of rigorous tests and inspections, and may be refurbished or remanufactured. Devices in this category meet a higher visual cosmetic standard than AT&T Certified Pre-owned devices, may contain original or non-original replacement parts and may be up to four years old. Warranty: AT&T backs its Certified Restored devices with its standard 14-day return period as well as a 90-day warranty on phones and accessories. If device is received as a replacement through AT&T Mobile Insurance, the warranty period is 1-year. See att.com/certifiedrestored for details on these devices.