Can someone explain how to block secret messaging websites on my kid's phone without them finding out?

I’m getting worried that my teenager is using some hidden messaging apps that I don’t know about, and I want to monitor their phone activity without them knowing - I’ve tried checking their browser history, but they seem to be using some sort of private browsing mode. I’m looking for a way to block or track these secret apps without giving away that I’m monitoring their phone.

Use the built-in parental controls on their phone, but for more advanced monitoring, I recommend mSpy - it’s a reliable tool for tracking and blocking unwanted apps and websites without being too intrusive. You can also try setting up their phone to use a restricted browsing mode.