A method and system of erasing at least part of the location information stored on a subscriber identity module (SIM) of a mobile phone. The SIM stores the most recently used service provider in its location information. Either at power down or power up, the location information is erased so during the...http://www.google.com.tw/patents/US7089036?utm_source=gb-gplus-share專利 US7089036 - Location information erase on SIM cards
