A method may include storing a database including a plurality of subscriber identifiers, wherein each subscriber identifier is associated with a telephone number and a subscriber name and address. Each subscriber identifier may be unique to the corresponding subscriber name and address. The method may include storing a database including a plurality of customer identifiers. Each customer identifier may be associated with one of the subscriber identifier and a customer name and address. The method may further include receiving an update to the subscriber name or address associated with one of the telephone numbers and associating a new subscriber identifier with the updated subscriber name or address. The method may further include associating the new subscriber identifier with one of the customer identifiers.