What do some French restaurants, the open sea, a small town in West Virginia and your favorite rock band concert have in common? All these are just some of the places where your cellphone won’t work for different reasons. Really!

Unless you're traveling on a huge cruise ship that has its own satellite-based technology to let you stay on the grid, the open sea is mostly one massive coverage gap. Or you arrive at your favorite band’s concert you’ve been waiting for years. You take the best shot ever and … you can’t share it online. Your phone might have four or five bars, but nothing works out. Wanna know why?

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