With over 100 new features, the free iOS 4 Software Update lets you do some amazing things.
How to install.
Make sure you are using the latest version of iTunes. Connect your iPhone to your computer.
When iTunes opens, select your iPhone under Devices in the Source List on the left.
In the iPhone Summary pane, click Check for Update.
Click Download and Install. Do not disconnect your iPhone until the update has finished.
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.1
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.2
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.3
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.
Compatibility
iOS 4 works with iPhone 4, iPhone 3GS, and iPhone 3G. Not all features are compatible with all devices. For example, multitasking is available only with iPhone 4 and iPhone 3GS.
iPhone 3G
iPhone 3GS
iPhone 4
