A method of using a mobile device to print onto a print medium, the mobile device comprising: a wireless transceiver for sending and receiving data via a telecommunications network; and a printer; the method comprising the steps of: (a) determining a geographical location of the mobile device; (b) determining...http://www.google.com.tw/patents/US7991432?utm_source=gb-gplus-share專利 US7991432 - Method of printing a voucher based on geographical location
