The benefits of novel technologies are often out of reach for the poorest billion on the planet. Instead of making things faster, bigger, and more futuristic, can we make things radically cheaper, simpler, and more inclusive? In this talk, I will describe some of our successes, failures, and lessons learned in deploying such "frugal technologies" in India over the past eight years. Drawing on projects in health, education, and citizen reporting, I will synthesize our experiences into a set of recommendations for anyone seeking to have social impact via technology.