Off-grid cell network
Smartphones are powerful devices but need one pesky thing: infrastructure. This candy-bar-size gizmo liberates your handset from its dependency on cell towers. Bluetoothpair one with your phone, and then beam messages over UHF radio waves to friends miles away who are also carrying the gadget. Because each antenna acts as a node in a mesh network, your range expands with each goTenna in the vicinity.