The new iPhone OS4 has more than 100 new feature but the most prominent features are below:
- Multitasking: Now you can run your favorite third-party apps — and switch between them instantly — without slowing down the performance of the foreground app or draining the battery unnecessarily.
- Folders: Organize apps into folders with drag-and-drop simplicity. Get faster access to your favorites and browse and manage up to 2160 apps.
- Even better Mail: See messages from all your accounts in a unified inbox, organize messages by threads, open attachments in third-party apps, and more.
- iBooks: More than a great ebook reader, iBooks is also an amazing place to browse and shop for books, day or night.
- Create playlists: Create custom playlists right on your iPhone.
- 5x digital zoom: Get closer to your subjects by zooming in up to 5x.
- Tap to focus video: While shooting video, tap the display to choose where to focus.
- Faces and Places in Photos: View photos based on who’s in them and where they were taken.
- Home screen wallpaper: Change the background wallpaper on your Home screen.
- Gift apps: Send apps as gifts to your friends or family.
- Spell checking: A built-in dictionary automatically suggests words and corrects spelling. It works in Mail, Notes, and other apps.
- Wireless keyboard support: Pair a keyboard based on Bluetooth wireless technology with your iPhone.

The new iPhone 4
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