Some links to check out if you are interested in learning more about Meshtastic. Easy to use, cheap, open source method of communication when the grid goes down or there is no cell phone service.
Official Meshtastic site: https://meshtastic.org
Documentation: https://meshtastic.org/docs/introduction/
Cheap Meshtastic devices:
SenseCAP Card Tracker T1000-E
SenseCAP MeshTracker X1 (upgrade to T1000-E)
Mac/iPhone/iPad/Apple Watch App: https://apps.apple.com/us/app/meshtastic/id1586432531
Android: https://play.google.com/store/apps/details?id=com.geeksville.mesh&hl=en_US
YouTube Step-by-Step Guide: https://www.youtube.com/watch?v=smQALUBiJ8s
