Distribute a file on one phone to many other phones nearby who have agreed to receive the distribution, using an ad hoc network possibly involving multiple hops. Do not rely on the existence of the cellular network.
The motivating application is the police confiscating cameras and cell phones of those seen recording police activity and jamming (or turning off, as SF BART did in anticipation of protests) the cell signal to thwart uploading the images and video before devices can be confiscated. With this technology, the information can still escape via a seemingly uninvolved bystander.
Possibly the mule's payload is encrypted to provide plausible deniability.
A mobile wifi hotspot might be a simpler solution, though has a single point of failure.
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