Never heard the term "juice-jacking" before today, but reports of the problem have been around for a while.
It used to be that phones would, by default, expose the filesystem to any USB connection. Newer Android devices require the user to actively choose to allow access.
My questions would be:
Several folks have advocated carrying a power-only cable. That's a reasonable preventative, but it's not a cure-all (more a defense in depth). Many charging stations don't offer ports, just hardwired cables with the various connectors.
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