Of the more than 4 billion mobile phone subscribers in the world, 64 percent are in the developing world. While cell phones have changed the way most Americans live, cell phone owners in the developing world use their phones in ways difficult for Americans to imagine.

Roben Farzad, senior writer for Business Week, speaks with host Peggy Wehmeyer about this developing world trend.

Encore presentation from January 9, 2010.

Music for this show ...