1. A method for inserting a model image into an image field of a signal, the method comprising: storing a model image that identifies a user in a database in association with billing information of the user and a specific category of signal; receiving information of an individual at an input device, the information including the specific category of signal selected from a list of categories by the user; receiving the information of the individual, including the selection of the specific category of signal, from the input device and determining whether the model image is stored in the database in association with the user; preparing the signal, the signal including the image field; inserting, with a processor, the model image that identifies the user into the image field of the signal in response to determining that the model image is stored in the database in association with the specific category of signal; and transmitting the signal that includes the model image that identifies the user to a display.