Mobile number portability allows mobile users to retain their original phone number when switching network providers. There are three types of number portability: operator portability, location portability, and service portability. The mobile number portability process involves a port in and port out process to activate a subscriber on the new network and deactivate them from the old network. Subscribers can port their number by sending a SMS message with their number to 1900 and receiving a porting code, then providing identification to a mobile retailer who handles the documentation process. Mobile number portability benefits subscribers through increased choice of providers and plans while simplifying the switching process.