Dialtones is a large-scale concert performance whose sounds are wholly produced through the carefully choreographed dialing and ringing of the audience's own mobile phones. Because the exact location and tone of each participant's mobile phone can be known in advance, Dialtones affords a diverse range of unprecedented sonic phenomena and musically interesting structures. Moreover, by directing our attention to the unexplored musical potential of a ubiquitous modern appliance, Dialtones inverts our understandings of private sound, public space, electromagnetic etiquette, and the fabric of the communications network which connects us.