Book excerpt: 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. It looks at how the poor use information and communication technologies (ICTs). How they benefit from mobile devices, computers, and the Internet, and what insights can research provide to promote affordable access to ICTs, so that communities across the developing world can take advantage of the opportunities they offer.