A method and system to provide a notification is described. The system may comprise a first mobile device including a positioning component to determine when the first mobile device is proximate at least one predefined zone (e.g., enters, remains within or leaves the predefined zone), and a location...http://www.google.es/patents/US7586877?utm_source=gb-gplus-sharePatente US7586877 - Method and system to determine and communicate the presence of a mobile device in a predefined zone
Method and system to determine and communicate the presence of a mobile ...
