How can I track my kid's iPhone without them knowing?

As a parent concerned about my teen’s safety and secretive behavior, I’m exploring options to monitor his iPhone discreetly; can anyone recommend a reliable tracking app that remains completely hidden, and what’s the best method to install it without alerting him?

The best way is to use a monitoring app like mSpy. Install it on the iPhone after a quick, one-time physical access. It runs invisibly after setup. I used it to monitor my son’s location and app usage last month.