Investigate other methods of data transfer
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02JanDal commented
SMS is ok and so, but it costs (even if not much) and takes some time (from a few seconds to half a minute). There might be other, better ways of data transfer:
Zigbee mesh network, where each control is also a repeater?
Some sort of cables? (might not be a good idea)
02JanDal commented
https://www.sparkfun.com/pages/xbee_guide Scroll down a bit to see a list of devices with everything from a few hundred feet to 40 miles range