Information and communication have always opened opportunities for the poor to earn income, reduce isolation, and respond resiliently to emergencies. With mobile phone use exploding across the developing world, even marginalized communities are now benefiting from modern communication tools. This book explores the impacts of this unprecedented technological change. Drawing on unique household surveys undertaken by research networks active in 38 developing countries, it helps to fill knowledge gaps about how the poor use information and communication technologies (ICTs). How have they benefited from mobile devices, computers, and the Internet?