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Heading into the wilderness where there's no cell service? You need GoTenna. It creates a private wireless network you can use to send text messages and share your location with friends.
GoTenna uses special radios to send messages between the two devices. It connects to your phone via Bluetooth.
GoTenna is sold in a two-pack, because you need one device per phone to communicate. GoTenna cannot connect to a regular wireless network, so you cannot use it to make calls or go online.
There's a strap on the back of each device that secures it to any bag or backpack. The strap comes in four colors: purple, orange, blue and green.
GoTenna recommends you strap the device to a bag, since it works better hands-free.
With the GoTenna app, you can send messages and send your location to anyone else with a GoTenna nearby.
GoTenna is no larger than a granola bar and is dead-simple to use. Just slide out the antenna to turn it on.