Tracking
Is there a way I can turn tracking back on, on my phone my nephew turned it off
iPhone 7 Plus, iOS 15
if find my is disabled no
if the phone is fully off one can't track it even if find my is on
if the phone does not have a wifi or cellular connection it can't be tracked
if the phone is not in a position to receive gps position or receive location data from a wifi router or cellular tower it can't be tracked
If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support