Before you can use Android Device Manager to locate your device: The location access of your LYF mobile phone needs to be turned-on and be signed in to your Google Account (Steps: use dropdown notification drawer on the top of the screen, and enable Location). Android Device Manager will not work for devices that are either turned off or don't have a mobile data or Wi-Fi connection.
After linking your phone to Google, you can locate or ring your phone by searching for find my phone on www.google.com. Follow the steps below:
Use the Android Device Manager website