Is it possible to see stored significant locations on my child's phone?

My son keeps saying he’s at a friend’s house but I have my doubts. I know iPhones store significant locations for frequent places, but when I check under Privacy > Location Services > System Services > Significant Locations, it’s empty. Is there another way to see this data or maybe it’s turned off? Just trying to keep him safe.

Significant Locations are only stored if the feature is enabled and haven’t been deleted. There’s no other way to retrieve this info without his phone or his cooperation.