A method for locating and contacting an owner of a lost wireless device. Preferably, the memory cells can avoid losing data even though the time interval between successive memory refresh operations is relatively long, as compared to the time interval between successive memory refresh operations in a conventional volatile memory device, such as a DRAM. The supplier system may be a legacy EDI based order system. Any oxide which deposits on the walls of the trench is removed before a thin gate oxide layer is grown on the walls.