I suspect that there are apps for tracking smart phones; but, I suspect that you wouldn’t want people tracking your phone usage. I recently saw the following device when I was thinking about remote off-road tracking solutions, to get me help where cell phones don’t reach. The devices and subscription service allows satellite tracking by others that you designate over the internet. Available on Amazon/com, REI, Cabela’s and others.
This one just for tracking (used with a subscription service)
https://www.findmespot.com/en/index.php?cid=128
This one that is for tracking and SOS signaling (used with a subscription service)
https://www.findmespot.com/en/?cid=101