Simple needs require simple solutions, right? Why reinvent the wheel when the tractor you already have will plow the field?
A farmer named Valishetty Narendra from India got tired of wading through the muck to turn on the water pumps in his fields. Being a creative person and, like most of the rest of the planet, someone who appreciated the finer possibilities of technology, Narendra integrated a mobile to the main water pump, programmed the phone to switch on the water, and then retired to the comforts of his farmhouse to try his experiment. One short phone call later and the water was flowing, in an electronic yet manual process that needed no amount of smartphone functionality to complete. All Narendra needed were a small homemade device and two mobile phones, only one of which needed to be able to make calls.