goTenna Mesh

Using technology previously only available to the military, the goTenna Mesh lets you send SMS and GPS locations between phones using UFC radio technology. Perfect for the avid traveler, back-country enthusiast or crowded events, goTenna lets you stay connected with your friends with family via an off-grid network that doesn't require service and won’t charge you roaming fees. Available at as a 2-pack ($249 CDN), 4-pack ($458), or 8-pack ($806).

gotenna.com