Device Pitstop: We Buy, Sell, Repair, Computers, Cell Phones and Tablets Device Pitstop is a unique store that buys, sells, trades, repairs, and upgrades computers, cell phones, tablets, and mobile devices. Our “gently-used,” refurbished, or repaired devices are sold at low prices – for top quality gear! We pay you cash for your used Apple or Windows cell phones, tablets and computers.