Other changes that have been made with the Android 5.1 Lollipop are related to alarms. The previous Android 5.0 Lollipop update needed users to control each alarm setting individually, but the Android 5.1 Lollipop enables users to turn down or turn up the volume of alarms simply by accessing the clock app or the alarms tab.
Protection is another feature improved by the update since now, users can easily protect lost and stolen devices. Device protection will have the phone locked until the user signs into Google account, even in the case when someone uses the factory data reset button. The feature is similar to the iOS iCloud collection, meaning that if one uses the factory data reset, he will have to sign in via his Gmail account in order to use the phone.
An additional improvement has been made to Voice Calling, enabling the users to use the VoLTE, or in other words, HD calling. The HD calling uses LTE for voice calls and it should make the calls HD and clearer. Among others, Android 5.1.1 Lollipop has made changes to dual SIM support, placing it into the OS, and thus enabling users to call others from either their personal or work SIM card.
The Android 5.1.1 Lollipop update can either be installed manually or with the OTA update. In order to install the update manually, the user will need to launch the Settings application and access the About Phone option. The users will be able to see the Check Now button. Tapping that button will make the AT&T servers check the phone’s eligibility for the update.