Is it actually safe to charge your iPhone at airport USB ports?

Summary
Using a random USB charger can be unsafe, even though the risk is minimal. Thankfully, you have ways to protect your devices.
Description from Engadget.
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Is it actually safe to charge your iPhone at airport USB ports?
Using a random USB charger can be unsafe, even though the risk is minimal. Thankfully, you have ways to protect your devices.
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