The Third Coast Festival (www.thirdcoastfestival.org/) is held annually in Chicago to celebrate and showcase all forms of audio work.

They've commissioned five short "phone plays" which are well worth a listen at http://www.thirdcoastfestival.org/audio_library.asp

More info on the plays:
WAIT FOR THE BEEP
A collaboration with Steppenwolf Theatre to create a
series of mysterious "phone plays"

Imagine this scenario: A cell phone rings and the owner is no where in sight...
so you pick it up. You see that there are unheard messages and, driven by curiosity,
you listen to them. What unfolds is a mini drama, dripping with the familiar themes
of love, revenge, loneliness, betrayal. Could this happen? Maybe, but what you're
listening to is one of five cell phone plays commissioned by the Third Coast Festival
in collaboration with Steppenwolf's new production of Sara Ruhl's "Dean Man's Cell Phone."