UpTrade Certified means the iPhone you buy will work and function just like new. Among hundreds of used phone and gadget sellers, we have chosen a modest bunch of reputable resellers and marketplaces that provide high-quality used iPhones for sale. An UpTrade Certified Used iPhone means it has passed an in-depth inspection by our Certified Seller.UpTrade Certified means the iPhone you buy will work and function just like new. Among hundreds of used phone and gadget sellers, we have chosen a modest bunch of reputable resellers and marketplaces that provide high-quality used iPhones for sale. An UpTrade Certified Used iPhone means it has passed an in-depth inspection by our Certified Seller.