Most of the Android manufacturer has their own way to locate lost or stolen Android devices. For example, Samsung Find My Mobile for Galaxy S4. Glad that Google comes out a universal way to track Android devices no matter Nexus series like Nexus 4 and Nexus 7 (2013) or Samsung Galaxy S4 and HTC One. Does it work on all the Android devices? Almost… Android Device Manager failed to detect my Galaxy S3 and Nexus 4 which are running on custom ROM. But working properly on Galaxy S4 with stock firmware. I still need to discover why.