Devices sold are used devices that have been refurbished. These devices are not brand new and are not always immaculate/pristine depending on the grade of the device purchased:
Excellent condition used mobile with little or minor signs of wear. Item has been fully tested in full working order.
Good condition used mobile, that will show moderate signs of wear across the device. Item has been fully tested and in full working order.
Average condition used mobile that will show signs of heavy wear but has been fully tested and in full working order.