Google said that the Android 5.1 will not be a game changer in terms of features update but rather targets security aspects for Android user. Android Platform vice president Dave Burke said in a blog post that most of the new features in the update are just meant to “get more out of your Android phone and tablet.” One of the features which could be interesting is the addition of High Definition voice calling promises “crystal clear calling” between compatible Android 5.1 devices. The new update also lets users to install more than one SIM card on a device sporting multiple SIM slots, a feature which was not available in the original 5.0 lollipop. As said above, the update is all about security. Google is giving Lollipop an extra layer of security with Device Protection. The new setting ensures a lost or stolen device will remain locked until the owner signs in with his or her Google account even if someone else tries to reset the device to factory settings. This feature will be set by default on Nexus 6 smartphones and also the Nexus 9 tablet. Google has said that other devices and manufacturers rolling out Android 5.1 lollipop will also get this feature by default. Android Lollipop version 5.1 is now available for Nexus 6 smartphones Over-the-Air (OTA).