A few days ago, Google announced the launch of a feature to help everyone find their phones (Android Device Manager), and today I accidentally noticed that this feature is already available in the system. This feature can be enabled in "Settings - Security - Device Manager," although the Web page address has not yet been made public (maybe I just haven't found it?).
For those who haven't seen this feature yet, you can try updating Google Play and Google Play Services. Google will officially release this service by the end of this month, and it will support Android systems version 2.2 and higher.
Based on personal experience, the first thing a thief does after stealing a phone is remove the battery/turn it off, then reset the device. I wonder how useful this service will be? Moreover, by launching this service, Google might embarrass many companies that specialize in providing phone-finding features.