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This is really interesting. It uses the multipeer connectivity framework to provide access to other iPhone users and allow them to send SMS and MMS messages even neither of them don’t has an WiFi/3G/4G connection. It does it by more or less daisy chaining a series of iPhones together and passing the message along from a to b to c to d, etc., etc. until it reaches the intended recipient. Neat, eh? AirDrop and Firechat both use it. You can read more about the technical aspects of it on Apple’s website.