The idea is to offer community members an option to use their payback points to crowdfund projects. Maybe some start-ups for example, that aim to improve access to mobile technologies in less wealthy countries? Or give them a choice of different projects/start-ups and then chose the most popular one?
Gifffaff gets more "buzz" and has a chance do do some social good. Users, I am sure, would appreciate such option too.
It would be another ways to show that giffgaff is a network that cares about people. Not only its own community, but from outside as well, and is willing to help entrepreneurs with good ideas!