Go Tenna was a Kickstarter I joined some time ago. I think it's a great idea as it allows use of cell phone text without cell signal. Mesh network.
But, it needs density. I have 2 and nobody else has them in my area. Colorado seems to have good Mesh Network.
However, if you only have 2 Go Tenna and 2 people with cellphones they can use them like walkie texties. Made that word up...
I have nothing to do with the product or company. https://gotenna.com/pages/mesh