Satellite phones draw their signal from satellites orbiting the earth, rather than a land-based cell tower.
The device has an SOS function that transmits your GPS location with an emergency signal to search and rescue teams.
HAM radios use radio frequencies to exchange messages or broadcast emergency calls. They have been used for well over a century, and their reliability has helped them stay relevant to this day.
The most common form of modern-day communications, you’ve probably already thought about using your cellphone off-grid.
A mesh network device will connect to your cellphone and allow you to create your own local network. This will then allow you to communicate with other mesh compatible devices in your area.