This only works if your phone or tablet is online and you've checked "Allow remote lock and factory reset" in the Google Settings app that's installed by Google Play Services. If your device is offline, it'll be locked once it's back online.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhKPVCw6ix0fr_udHxfSfekMW4-zbzBpQV86B9irEzdSPkPWKEE42imDGKD35bJ6MjEgBWBrQWN0GNjsbV9C1PycEgQRZ97RQRCcmQkj3HI__UNtSDQpxiKKQkFh5a6XNCF1uwIQgYRJJ_h/s640/android-device-manager-lock.png)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjjA8_dzSm7zM3_eyyDltujyaYzy1TTp_Tuv-u58IwY8kAlyilFBt9eFJaWvm1imVDr61begXa-tEkst3ABKij77d1Lo3UmHxhqZ719Reu-6k8W_Gx_Y8CNlswVOor0XmeevcsnM4Ae7FO5/s640/android-device-manager-lock-2.png)
It's interesting to see that Android Device Manager doesn't use Google Play branding and it's available at google.com/android/devicemanager. The service has a generic name which suggest that it could add other features not related to finding your phone. For example, it could let you backup your data online, manage your apps or check your notifications. Android Device Manager's codename is Google Nova, while the service name is "androidconsole".
{ via Android Police }