 Never plug your phone into a public USB charging station. Your passwords, bank information, and everything else you have on your phone could be stolen. So, while you think you're getting a quick charge, hackers are actually installing malware and exporting all your personal data. Here's three ways you can protect yourself. Always carry your own charger and plug directly to an electrical outlet instead. An external battery is also good to have. Never borrow a charger from someone you don't know. Use a USB condom. Yeah, that's what they're actually called. It's basically a layer of protection between your phone and the charging device.