How to reach the unreachable
SMS for life campaign by Novartis is an interesting example to look at. They reached the most remote areas of Africa to deliver anti-malaria drugs. Their solution used mobile phones: http://malaria.novartis.com/innovation/sms-for-life/index.shtml
This explains Novartis' SMS for life campaign in Africa, which is an interesting source of inspiration of how to reach the unreachable.