Invented is a facility service to be used as a component service for building compound wireless mobile communication services (CWSs). The name ascribed to this facility service is Invoke. The purpose of Invoke is to detect the events signifying that the CWS operation is to commence and then initiate (or invoke) the CWS execution. The events represent variables within a Boolean expression parameter of an Invoke service. The Boolean expression allows Invoke to be very versatile with respect to the possible combination of events for CWS invocation. Versatility is enhanced by the wide variety of events that are recognized; e.g., entering a geographical location, recognizing an audio signal, reaching a time of day, observing a specific caller ID. The Invoke facility service contains other parameters useful at CWS invocation; e.g., CWS password protection, CWS initialization of constants and variables, linkage to other CWSs to acquire data.