Automatic aftercall directory and phonebook entry advertising

A system for automatically sending a message to a mobile device connected to a Mobile Operator's network, the message being configured to display a request to add contact information of a business to a phonebook of the mobile device, the system comprising:

• a call switch, billing platform, or Home Location Registry (HLR) of a Mobile Operator's wireless cellular or data network, configured to determine that a call connected from the mobile device to a destination address associated with a business has disconnected;
• a server operably connected to the call switch, billing platform, or HLR via an Application Programming Interface and configured to:
• upon receipt from the call switch, billing platform, or HLR of an indication that a call connected from the mobile device to the destination address has disconnected, prepare a first communication comprising an originating address associated with the mobile device, the destination address, and a message comprising:
• a request to add contact information of the business to the phonebook of the mobile device and an actionable response option configured to accept the request when selected on the mobile device;
• and
• a command configured to instruct the mobile device to display the message on a screen of the mobile device;
• send the first communication from the server to the mobile device;
• receive a response from the mobile device indicating that the request was accepted;
• and
• an application installed on a SIM card of the mobile device and configured to execute the command to display the message on the screen of the mobile device and to add the contact information to the phonebook of the mobile device when the actionable response option is selected on the mobile device.