Today Steve Jobs is addressing iPhone 4.0 OS event which is being held at Apple, Building 4, Town Hall unveiling iPhone OS 4.0 features for iPhone, iPad & iPod Touch. Over 1500 new APIs are made available in OS 4 in addition to 100 new user features. Let’s have a quick byte of all the features that iPhone OS 4.0 has to offer.

iPhone OS 4.0 Features for iPhone, iPad & iPod Touch
- Over 1500 new APIs; Devs can access the calendar, photo library, quicklook.
- A new framework called “accelerate” for hardware accelerated math functions.
- 100 new user features. Create playlists, 5x digital zoom, tap to focus on video, gift apps, geotagging, places in the photo app, change the home screen wallpaper, Bluetooth keyboards… spell checker.
- Support for Bluetooth Keyboards.
- Multitasking, as speculated earlier.
- Background Audio
- VoIP (Voice Over IP)
- Background Locations
- More Privacy Features
- Local notifications (like Push Notifications but doesn’t use Apple’s servers)
- Folders to organize all the apps
- Customizable Wallpaper on Home screen
- Intelligent Naming
- Drag and drop UI for folders
- 2160 apps can now be installed on iPhone
- Unified Inbox
- iBooks for iPhone and iPod touch
- Support for multiple Exchange account with Exchange Server 2010
- Game Center (invite friends, matchmaking, leaderboards, achievements, social gaming network)
- iAd Mobile Advertising
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