This is the first time Apple have changed the complete look of its iOS since the first iPhone was launched although there were some changes and upgradations happened with new features which were added from time to time with the launch of new iPhone.
New Looks, Smarter Siri, better notifications, more capable multitasking and toggle between the Apps, New Camera and gallery with Automatic tagging, Updates to Safari Browser and App store, Audio only face time, AirDrop, iTunes Radio, Better weather alert, these all are fresh and new looking.
All new looks with redesigned icons with flatter and unified looks, animated wallpapers are now available in iPhone just like Android devices and there’s a dynamic parallax effect between the icons and the wallpaper as you turn or title or phone which looks amazing.
Multitasking: iOS 7 have a much better support of multitasking and it allows apps to update it based upon the usage of specific app i.e whether you use it in morning or evening etc. and lets the app to update during that period. Also when you wake the device it will use the battery and at that time it allows apps to update, all this will help to improve battery life.
Siri: It got better interface which is similar to Google now with card based UI and services to provide answers to the questions including from Twitter, Wikipedia and Bing. It can also control your iDevice (increase brightness, turn on Bluetooth) and it offers a new, more life-like voice (both female and male) for English, French and German.
New camera and Gallary: The Photos app has been redesigned and now sort your photos based on where and when you took them – automatically putting a meaningful title to the collections. Zooming out shows new auto-generated albums for multi-day trips and zooming out even further groups the photos in years.
Safari Browser: The Safari browser for iOS was updated with a new 3D UI for switching tabs (looks kinda like the one Chrome for Android has) and you’re no longer limited to only 8 tabs. The browser now features a single smart search filed rather than having two fields – one for URL typing and another one for initiating Google searches.
Air Drop: which is Apple’s answer to NFC (they even made a joke about not having to bump your phones together). It’s a streamlined and centralized interface for sharing stuff with other people, who our close by. It uses a peer-to-peer Wi-Fi connection for that.
App Store: It got tweaked too – it now automatically updates apps (hi, Play Store) and suggest apps based on your location (just like Windows Phone).
Facetime: It now support only voice calls as well, which is basically VOIP calling.
Checkout below Video of iOS 7.