It's best use is alternative communications in a disaster, where the mobile network is affected. Or if a dictator decides to shut it off during a protest.

Overall it could work well as a communications means for activists in street protests since these often overload networks by sheer volume of users concentrated in one spot.

Seems like this could be very useful if in a country with poor communication systems or a wartorn area. Also worth saving (print it out perhaps) if in the US and Trump becomes king.

Well I had many blogs about how to add sensors etc. Mostly I personally use it as walkie talkie but also I have seen people use it as a tracker for pets, and motion sensors at home maybe. I use it for temp sensor in each room in a handheld and I will take out for hikes etc.