Google has released a new version of lollipops in March 11 lollipops 5.1. This update is an important feature, the device protection. These features can be protected from theft Android phone from Google.

This feature can be protected through the use of only Google account on Android devices. As far as the device remains locked until it is certain that not log in with a Google account.
In this case, the phone will not work on any of the factory riseteo. Although the factory reset to unlock the phone with a Google account to login. After several failed attempts to unlock the phone, the phone will brikada materially.
Earlier, Apple had similar features. IOS 7 operating system feature was added to the 'activation lock. San Francisco, 40 percent and 5 percent in New York to introduce this feature in iPhone theft is reduced.