There have been attempts in this space before and they haven't worked out real well. AirTime is one such example (http://en.wikipedia.org/wiki/Airtime.com http:

There have been attempts in this space before and they haven't worked out real well. AirTime is one such example (http://en.wikipedia.org/wiki/Airtime.com http://en.wikipedia.org/wiki/Airtime.com)