The present invention is a method for restricting calls to a cell phone, including the steps of: receiving restriction information; testing an incoming call to the cell phone against the restriction information; and, if testing determines that the incoming call is restricted, routing the incoming call...http://www.google.com.hk/patents/US7218924?utm_source=gb-gplus-share專利 US7218924 - Method for restricting calls to a cell phone
