Here are the steps to track a phone:

1. Download and install a phone tracking app on the target device.
2. Launch the app and enable location tracking.
3. On your phone's browser, go to the FindMyDevice website.
4. Input their Gmail in the search box to see their location.
5. As long as their phone is on and has Wi-Fi or mobile data, you will see where they are.

I hope that helps! Let me know if you have any other questions.