This document discusses how mobile phones can help achieve the Millennium Development Goals (MDGs) by reaching remote, "last mile" communities. It notes that 50 countries are not on track to meet the MDGs, especially in Africa. The author believes current strategies have limitations and that rethinking assumptions is needed. Mobile phones can play several roles, including substituting for transportation, providing on-demand advice and education, cutting delays in information sharing, and enabling citizen monitoring and accountability. The author outlines a birth registration partnership in Uganda between the government and a mobile carrier that leverages phones to scale up registration at low cost. He poses questions for private sector actors on how they can further support development goals through technology and partnerships