No service? goTenna hardware and iOS app let you text off-the-grid
If you’ve ever been on a hike, out of the country, or at a crowded concert with no service, goTenna is aiming to be your connectivity solution. The hardware accessory combined with an application for both iOS and Android says it will allow you to create a local network that works reliably. The network is based on a group of people each having a goTenna stick connected to the iPhone. The video from the company, below, explains it well: