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Learn how to develop mobile applications for data collection in remote areas with limited or no internet connectivity through this 53-minute conference talk from Android Makers. Explore the unique challenges of creating decentralized data-collecting applications for NGOs and Ministries of Health in developing countries, where mobile phones are more prevalent than computers. Discover practical solutions for sharing information without internet connections and synchronizing months of accumulated data without loss, using IASO as a real-world case study - a mobile application currently deployed in developing countries for beneficiary follow-up, disease elimination efforts, and infrastructure improvement projects. Gain insights into mobile development beyond traditional messaging, banking, and entertainment applications, focusing on life-changing tools that serve critical humanitarian and public health purposes in the world's most challenging connectivity environments.