Ensuring that patients adhere to prescribed medication remains an important challenge in global health. While technology has been utilized to monitor and improve adherence, solutions to date have been too costly for large-scale deployment in developing regions. This paper describes 99DOTS, a low-cost approach for tracking adherence using a combination of paper packaging and low-end mobile phones. Every day, patients reveal an unpredictable phone number behind the pills and send a free call to that number to indicate that drugs were dispensed and taken. Within five years of its inception, 99DOTS has become a standard of care for tuberculosis in India and has enrolled over 200,000 patients. We provide a holistic account of the project's evolution, including its iterative design, scaled implementation, and lessons learned along the way. We hope this account will serve as a useful case study for anyone seeking to establish and scale new low-cost technologies for a global audience.

Cellphones have the potential to improve education for the millions of underprivileged users in the developing world. However, mobile learning in developing countries remains under-studied. In this paper, we argue that cellphones are a perfect vehicle for making educational opportunities accessible to rural children in places and times that are more convenient than formal schooling. We carried out participant observations to identify the opportunities in their everyday lives for mobile learning. We next conducted a 26-week study to investigate the extent to which rural children will voluntarily make use of cellphones to access educational content. Our results show a reasonable level of academic learning and motivation. We also report on the social context around these results. Our goal is to examine the feasibility of mobile learning in out-of-school settings in rural, underdeveloped areas, and to help more researchers learn how to undertake similarly difficult studies around mobile computing in the developing world.

In this paper we present the results of a field study of Avaaj Otalo (literally, "voice stoop"), an interactive voice application for small-scale farmers in Gujarat, India. Through usage data and interviews, we describe how 51 farmers used the system over a seven month pilot deployment. The most popular feature of Avaaj Otalo was a forum for asking questions and browsing others' questions and responses on a range of agricultural topics. The forum developed into a lively social space with the emergence of norms, persistent moderation, and a desire for both structured interaction with institutionally sanctioned authorities and open discussion with peers. For all 51 users this was the first experience participating in an online community of any sort. In terms of usability, simple menu-based navigation was readily learned, with users preferring numeric input over speech. We conclude by discussing implications of our findings for designing voice-based social media serving rural communities in India and elsewhere.