The Mobile Phone Orchestra (MoPhO) is a new repertoire-based ensemble using mobile phones as the primary musical instrument. Far beyond ring-tones, MoPhO's interactive musical works take advantage of the unique technological capabilities of today's hardware, transforming phone keypads, built-in accelerometers, and built-in microphones into powerful and yet mobile chamber meta-instruments.

MoPhO was instantiated in 2007/2008 at CCRMA, Stanford University, by faculty member Ge Wang, Deutsche Telekom senior research scientist Georg Essl, and visiting CCRMA researcher Henri Penttinen, with CCRMA Artistic Coordinator Chryssie Nanou, 2007-2008 MA/MST students, and generous support from Nokia. MoPhO performed its first public concert in January 2008.