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What about leveraging those 125 million with cell phones but not enough sanitation or clean drinking water to do the data backhaul for the sensor nodes?
WIfi, bluetooth, NFC, as well as the cellular radio itself to the sensor and back, even outside of cell coverage, piggybacking the cell phone to hand off the data next time in range. Low data volume relative to user data or phone is small %, so not a big cost, this could be paid for by system beneficiary.