Israel’s SOS WiFi beams a signal that allows cellphones to freely connect to the Internet even in some of the most remote parts of Israel. It can send warnings of danger to hikers or give them a lifeline to the outside world if they need rescue or help.

https://www.timesofisrael.com/group-aims-to-give-hikers-emergency-wifi-no-matter-how-far-off-the-beaten-path/

http://soswifi.co.il/