A back-end system for a public address system, comprising: an antenna for wireless communicaton via a short range protocol; a computer that comprises: a first interface and first application software for transmitting connection information to and in response receiving requests from a plurality of wireless mobile communication devices (110, 110', 110") via a cellular network and in response arbitrating between said requests and sending a connection authorization message to one of said wireless mobile communication devices (110, 110', 110") via the cellular network, said connection authorization message is to enable said one of said wireless mobile communication devices (110, 110', 110") to access the public address system via said antenna; and a second interface connected to said antenna and second application software for receiving, via said antenna and in response to sending the connection authorization message, wireless signals from a short range communications component of said one of said wireless mobile communication devices (110, 110', 110") and converting said wireless signals to audio signals; and an audio interface for transmitting said audio signals to a sound system. an antenna for wireless communicaton via a short range protocol; a computer that comprises: a first interface and first application software for transmitting connection information to and in response receiving requests from a plurality of wireless mobile communication devices (110, 110', 110") via a cellular network and in response arbitrating between said requests and sending a connection authorization message to one of said wireless mobile communication devices (110, 110', 110") via the cellular network, said connection authorization message is to enable said one of said wireless mobile communication devices (110, 110', 110") to access the public address system via said antenna; and a second interface connected to said antenna and second application software for receiving, via said antenna and in response to sending the connection authorization message, wireless signals from a short range communications component of said one of said wireless mobile communication devices (110, 110', 110") and converting said wireless signals to audio signals; and an audio interface for transmitting said audio signals to a sound system. a first interface and first application software for transmitting connection information to and in response receiving requests from a plurality of wireless mobile communication devices (110, 110', 110") via a cellular network and in response arbitrating between said requests and sending a connection authorization message to one of said wireless mobile communication devices (110, 110', 110") via the cellular network, said connection authorization message is to enable said one of said wireless mobile communication devices (110, 110', 110") to access the public address system via said antenna; and a second interface connected to said antenna and second application software for receiving, via said antenna and in response to sending the connection authorization message, wireless signals from a short range communications component of said one of said wireless mobile communication devices (110, 110', 110") and converting said wireless signals to audio signals; and an audio interface for transmitting said audio signals to a sound system.