In regards to this update, Google has released a short video as a token of confirmation. The video's background score is the groovy 'Koi yaha naache naache' with the signature Android caricatures having a party announcing that ‘things have just got better' and that ‘Android One (smartphones) upgrade to Lollipop 5.1′.
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As the roll out of this update being carried out in batches, users have to wait for sometime before it shows up on the device. Moreover, you can check the update manually by going to About → System updates in your device.
Android 5.1 is the first big maintenance release for Lollipop, fixing bugs and improving performance and stability over the original 5.0 release.
Moving on to the features of Android 5.1, the quick settings panel has been polished up a bit in Android 5.1. Also, Android 5.1 also introduces dual SIM support as a built-in Android feature.
Android 5.1 brings some much-needed clarity to Lollipop's somewhat confusing screen pinning feature, which was designed to make it easier to lock kids or guest users into a particular app.
Device Protection in Android 5.1 will help to secure your device even if it's lost or stolen. With this feature enabled, a thief won't be able to use your device, even after factory resetting it without having your Google account login details.
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In this update, Google has made some tweaks to the volume slider and interruptions system. Previously, in the Android, there is no traditional option for Mute.
And some other small features includes New animations in Clock app, Contacts lose colored overlay and Google+ linkage, Sticky soft keys fix, Hide 'Heads-up' notifications without dismissing, A new status bar icon when there's no SIM inserted, NuPlayer now the default streaming player.