Here is a handy tool that lets you stay connected with your friends off the grid. Beartooth pairs with your phone and lets you talk, text, and use maps when you have no cellular signal. The device has a range of 5 miles for voice and 10 miles for text (line of sight). It comes with a 4-day battery life and AES 256-bit encryption.
Beartooth has a USB Type-C port. It connects to your smartphone via Bluetooth. With mesh networking, you get an extended range. You can get yours for as low as $99.