Field coordination for public programs is the real-time exchange of instructions, status reports, and alerts between a central operations team and distributed agents or participants in the field. Across most of the world, this workflow runs on SMS because SMS is the only channel that works everywhere.
When I was a Peace Corps volunteer in Tanzania, I learned something that has shaped how I think about technology ever since. The most important work people were trying to accomplish didn't happen where the internet was. It happened in villages connected by dirt roads, in health posts with no reliable power, in community centers where a feature phone was the most sophisticated device in the room. The question was never whether people wanted to coordinate or communicate at scale. The question was what tools were actually usable in the conditions they were operating in.