@Yifan, thank you for your question. The system can be run from a central server, so it should be available to anyone in the world with a phone. I prototyped it using my own laptop, and everyone in the room was able to retrieve information on their own phones. Aissata from There Is No Limit is from Guinea, and she thinks that people without phones themselves probably know someone from their village who would send a (free) text for them. Information about nearby outbreaks would probably be of town-wide interest.