[Optimus L3, L5, L7 General] Paget96:
General discusion about KITKAT for L5 & L7

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The Android 4.4 KitKat operating system uses advanced memory optimization technologies. As a result, it is available on Android devices with as little as 512 MB of RAM. This is important because previous versions of the operating system required more internal memory which made them incompatible with many older device models. This was a major cause of the problem known as Android fragmentation.

Android 4.4 KitKat features a cleaner user interface, Near Field Communication (NFC) support and always-on touch screen action buttons, which replace the need for the physical buttons found on many Android devices. KitKat also boasts an improved security-enhanced Linux module, which helps prevent unauthorized app access.

Google announced Android 4.4 KitKat in September 2013 and debuted it on the Nexus 5 smartphone the following month. For months prior to the release, observers expected the OS to be called Key Lime Pie, but Google renamed it as part of a marketing promotion with the Hershey Company, which sells a candy bar called Kit Kat in the United States.

Smart, simple, and truly yours

Beautiful & Immersive

A more polished design, improved performance, and new features.​

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Just say “Ok Google”

You don’t need to touch the screen to get things done. When on your home screen* or in Google Now, just say “Ok Google” to launch voice search, send a text, get directions or even play a song.

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A work of art​

While listening to music on your device, or while projecting movies to Chromecast, you’ll see beautiful full-screen album and movie art when your device is locked. You can play, pause, or seek to a specific moment.

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Immerse yourself

The book you're reading, the game you're playing, or the movie you're watching — now all of these take center stage with the new immersive mode, which automatically hides everything except what you really want to see. Just swipe the edge of the screen to bring back your status bar and navigation buttons.

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Faster multitasking​

Android 4.4 takes system performance to an all-time high by optimizing memory and improving your touchscreen so that it responds faster and more accurately than ever before. This means that you can listen to music while browsing the web, or race down the highway with the latest hit game, all without a hitch.

Smart & Simple

Google smarts improve every corner of the Android experience.

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The future is calling

The new phone app automatically prioritizes your contacts based on the people you talk to the most. You can also search for nearby places and businesses, your contacts, or people in your Google Apps domain.

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A smarter caller ID​

Whenever you get a call from a phone number not in your contacts, your phone will look for matches from businesses with a local listing on Google Maps. Learn more about caller ID by Google.

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All your messages in the same place

Never miss a message, no matter how your friend sends it. With the new Hangouts app, all of your SMS and MMS messages are together in the same app, alongside your other conversations and video calls. And with the new Hangouts, you can even share your location and send animated GIFs.

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Emoji everywhere​

Sometimes words can’t express how you feel. For that, there’s Emoji, the colorful Japanese characters, now available on Google Keyboard.

Grab & Go

New features help you get things done while you’re on the move.

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Print wherever, whenever

Now you can print photos, documents, and web pages from your phone or tablet. You can print to any printer connected to Google Cloud Print, to HP ePrint printers, and to other printers that have apps in the Google Play Store.

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Pick a file, any file​

From apps like Quickoffice, you can open and save files on Google Drive, other cloud storage services, or your device. And with quick access to recently used files, it's easier than ever to send the file you were just working on.

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Your office, anywhere

Create and edit documents, spreadsheets and presentations from your phone or tablet with the newly redesigned Quickoffice

Even more features

For those of you looking to go deeper, here's an exhaustive list of all the updates found in Android 4.4, KitKat.

Bluetooth MAP support

Android now supports the Message Access Profile (MAP) so Bluetooth-enabled cars can exchange messages with your devices.

Chromecast support

With your Android device and a Chromecast, you can enjoy your favorite online entertainment, from Netflix, YouTube, Hulu Plus, and Google Play on your HDTV.

Chrome web view

Applications that embed web content now use Chrome to render web components accurately and quickly.

Closed captioning

Android now supports closed captioning and subtitles. To turn on closed captioning, go to Settings > Accessibility and turn on Captions.

Device management built-in

If you ever lose your device, you can find or wipe it with the Android

Device Manager

Downloads app redesign

The Downloads app has been redesigned, giving you new sorting options and list and grid views for all the files you’ve downloaded.

Easy home screen switching

If you love to customize your device and have installed one or more home screen replacements, you can switch between them easily in Settings > Home.

Email app refresh

The redesigned Email app has a fresh new look with nested folders, contact photos and better navigation.

Full-screen wallpapers with preview

Your wallpaper now extends through the notification tray and system buttons. And when you change your wallpaper, you can preview just how it will look before you set it.*

HDR+ photography

HDR+ mode on Nexus 5 automatically snaps a rapid burst of photos and combines them to give you the best possible single shot. Daytime pictures are vivid with clean shadows, and nighttime photos are sharp with less noise.*

Infrared blasting

On devices with an infrared (IR) blaster, Android now supports applications for remote control of TVs and other nearby devices.

Location in Quick Settings

Access your location settings from anywhere with a new tile in Quick Settings.

Location modes and monitoring

If you want to conserve battery, go to Settings > Location to switch between high accuracy and battery-saving location modes. There’s no need to toggle GPS, Wi-Fi, and mobile network settings. And to see which apps have recently requested your location, go to Settings > Location.

Low-power audio playback

Android 4.4 on Nexus 5 lets you listen to music for longer - up to 60 hours of audio playback.*

Music and movie-seeking from lock screen

Jump to a specific part of a song or video from your lock screen. Just long press on the play or pause button and then select the point you want.

Secure app sandboxes

Application sandboxes have been hardened with Security-Enhanced Linux.

Step counting built-in

When you use fitness apps like Moves on Nexus 5, the phone acts as a pedometer to count steps. Android 4.4 and updated hardware make this a more battery-friendly way to measure your activity.

Tap to pay, built a new way

Android 4.4 introduces a new, open architecture for NFC payments that works with any mobile carrier, and lets apps manage your payment information in the cloud or on your device. Now you can tap to pay with Google Wallet or other apps at more than a million stores.

Touchscreen improvements

Improved software and Nexus 5’s new hardware mean Android responds to your touch faster and more accurately than ever before.*

Version history(Codenames, Tags, and Build Numbers)