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If you leave your phone locked the whole time, it will just not trust the device it’s plugged into by default. Just be sure to say “Don’t Trust” if you see the popup.

Your iPhone or iPad will still charge from it normally, so there’s no real risk in plugging your phone or tablet into a USB charging port in a public place or someone else’s laptop if that’s all you have available to you. If you don’t trust a computer or device you’re plugged into, it won’t be able to access your files. Because the charging cable is the same as the data transfer cable, this provides an additional layer of security that allows you to charge your device without giving a malicious charger access to your stuff. Apple added this prompt in iOS 7 to prevent such attacks, ensuring your phone or tablet’s files are protected from devices you plug it into unless you specifically agree. “ Juice jacking” is an attack that uses compromised USB chargers to access files on devices.