Why is cellular signal required for lessons? I went through 12 years of school in Eastern Europe without anyone in the entire country having cellular signal, or cellular phones. (Well mostly, towards the end they appeared, but had no effect in school). Granted, perhaps the lessons were less than perfect, but they were way better than nothing.
Look at the photo (linked to elsewhere in this thread).
If it's anything like some of the parts of the big rez I've been to, the nearest school is probably three hours away over sand/dirt roads. The teacher teaches remotely to children spread over a thousand square miles.
It's to have something better than just the bare minimum. I remember seeing similar reports about higher education in remote villages in India, with cellular networks and internet access allowing people to learn without being able to move to somewhere close to sufficiently qualified teachers.