The Cloud Phone -> Bottom of Pyramid

Heard of cloud computing? Probably, yes. Heard of the cloud phone? Similar idea, different medium.
Despite the growing number of mobile users worldwide, many still have to borrow phones to make a call. Such calls can be accompanied with “borrowing premiums,” escalating costs for users. So, why not give everyone a virtual number, something that they can plug into any mobile, determine how much talk time or credit they have, and use accordingly?

(Full link: http://dowser.org/movirtu-building-a-virtual-mobile-phone-for-the-bop/ - thanks to Sheryl Shah for sharing!)