A virtual door knock notification system notifies a user when a visitor arrives at a user’s address or a person associated with a service arrives at the user’s address to deliver the service. The service may include, e.g., a meter reading service or a package delivery service. The virtual door knock notification system first determines a location of the visitor or the service person. The system then retrieves an address of the user. Accordingly, the system provides a notification to the user when the determined location of the visitor or the service person is in close proximity to the address of the user. The notification acts as a virtual “door knock” for the user.
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Klein, Daniel and Jackson, Dean, "VIRTUAL DOOR KNOCK NOTIFICATIONS", Technical Disclosure Commons, (April 16, 2015)