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In this paper we describe our experiences designing a voice interface in rural India. We outline our design process from initial contextual inquiry to a formal user evaluation, and use this discussion to motivate research guidelines for others designing voice interfaces in developing regions. Our three guidelines are to build around existing information systems, to iterate on the design through user testing, and to explore design alternatives through empirical analysis. We also share some practical lessons learned in designing, implementing, and evaluating information systems for developing regions in general.