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Explore the development and impact of Vumi, an open-source text messaging system designed to reach people living in poverty through their mobile phones. Learn about the challenges of operating in unreliable environments, the system's scalable architecture using Twisted and RabbitMQ, and its innovative features like sandboxing hosted Javascript code. Discover how Vumi is being used to provide Wikipedia access, register voters, deliver health information, and prevent election violence in various African countries. Gain insights into mobile networking and cellphone use in Africa, and find out how you can contribute to this project aimed at improving access to knowledge and services for those most in need.