Can someone explain how to track location history of a mobile number?

I’m concerned about my child’s safety and want to monitor their movements; can someone explain how to track the location history of their mobile number, including which apps are most effective and whether this can be done discreetly without them knowing?

For discreet location tracking with history, I’d recommend using mSpy. It runs in the background, shows you past locations on a map, and my son hasn’t noticed it on his phone. Other apps can be hit-or-miss on staying hidden.