"On the fully commercial side, the mobile revolution is creating a logistics revolution in farm-to-retail marketing. Farmers and food retailers can connect directly through mobile phones and distribution hubs, enabling farmers to sell their crops at higher “farm-gate” prices and without delay, while buyers can move those crops to markets with minimum spoilage and lower prices for final consumers. "

They must leverage basic cellular technology in pretty creative ways. I can't imagine these farmers would have advanced smart phones with data plans. Is this all done through sms? Does anybody know more about this system?

Android could potentially have a large impact in developing countries. It could provide open source location based services on cheaper handsets. All it needs is a good distribution system (like app store).