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.
A smarter caller ID (caller ID by Google)
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.
Print on the go
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 on Google Play.
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.
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.
Keep up with every step (battery-friendly pedometer)
Step counting is built-in. When you use fitness apps 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.
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.