This cheap gadget can stop your smartphone or tablet being hacked at an airport, hotel or cafe
Look, I'm not super paranoid. Really, I'm not. But there are three things that I make sure I do when I'm out and about. I seek out the best coffee I can find. I make sure I use a VPN when using public Wi-Fi, and I always make sure I use a USB data blocker, otherwise known as a USB condom
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While the risk from using public USB power charging stations at airports, hotels, and other locations might be small, a USB port is a gateway into a device, and allowing any scabby charging station access to my devices seems overall like a bad idea. Where I can I like to use my own chargers of power banks, but for those occasional times when I can't do that, I carry on my keyring a small USB data blocker.
There is a number out there, but the brand I trust is PortaPow (because I've tested them and taken them apart to see how they work). PortaPow's 3rd-gen USB data blocker blocks all data transfer, but the built-in chip detects the type of device which is connected and swaps between Apple, Universal, and Samsung charging specifications, thus enabling the fastest charge possible.
PortaPow 3rd-gen USB data blocker
There's also a USB-C version of the 3rd-gen data blocker available.
And, for the ultra-paranoid, "="" data="" blocker"=""> that contains no electronics at all other than a wire bridge for the power and even has a see-through case so you can be sure no shenanigans are going on.
Another that you can try is the Original USB Condom.
Small, easy to carry, and offering a good piece of mind.