A relative veteran on NextBillion, Grameenphone's mobile business model set an early standard for innovative service provision. The concept of at-your-door delivery of traditionally unaffordable goods and services --to remote and poor communities also works well with low-cost health care, using health vans and medicine trains. The same concept (sometimes on foot) seems to work for providing "Portacredit" microloans in Ecuador.

Now, I notice that this mobility-enabled delivery model seems to have caught on best for education: Check out India's Mobile Solutions Center