A method, system, server architecture and/or tangible medium determines and/or transmits and/or establishes communication with a mobile device user. The method includes, for example, receiving a communication from and/or transmitting a communication to, an event customer, and optionally updating a database to reflect the communication. The method also includes obtaining at least one mobile address, e.g., a telephone number and a communication network used thereon by the event user and building a data address therefrom to establish the communication with the event user. In one embodiment, the method does not require the event user to provide a network address associated with the mobile contact address. Various optional embodiments are disclosed.