clb92

Have you noticed your phone doing things by itself (such as opening the browser and downloading a file, opening apps or sending things) while plugged into the cable? If you're really paranoid you can buy the Malicious Cable Detector and test the cable https://shop.hak5.org/products/malicious-cable-detector-by-o-mg

What makes you think someone switched the cable?

The O.MG cables are tools that you can use to inject keystrokes (the cables *basically* act like an automatic keyboard), so you'll need to be able to be able to install and run your own payload on the target device via keystrokes. And yes, your target device will need to be unlocked in most cases. The keylogger functionality is a thing if you use the cable to connect a keyboard to e.g. a computer.

Are you plugging a keyboard into a device with the O.MG Cable?