This only works if you turn it on before you need it
Find My Device is useless if you try to turn it on after the phone is already lost -- it has to already be active, with location and an internet connection on, for any of the location, ring, lock, or erase features to work when you actually need them.
Pair it with a strong screen lock
Find My Device helps you recover a lost phone or protect your data remotely, but a strong screen lock is still your first line of defense -- it buys you the time to reach another device and act before anyone else can get into your phone.
Frequently Asked Questions
Does keeping Find My Device turned on drain the battery?
It uses only a small, ongoing amount of power to keep location available, which most people don't notice in day-to-day battery life.
If I remotely erase the device, can I still track it afterward?
No -- once you erase a device remotely, your personal data is wiped for safety, but Find My Device can no longer report its location after that.