Apple iPhone 6s Plus a1687 128GB Space Gray Smartphone GSM Unlocked (Refurbished) 12.0 MP iOS - Apple Apple A9 GSM Unlocked A Certified Refurbished product has been tested and certified to work and look like new, with minimal to no signs of wear, by a manufacturer or specialized third-party seller approved by Amazon. All products are backed by a minimum 90-day warranty.