The iOS 4.0.1 Software Update improves the formula to determine how many bars of signal strength to display on iPhone 4, iPhone 3GS, and iPhone 3G. The real signal strength remains the same, but the bars on iPhone will indicate it more precisely.
iPhone 3G and iPhone 3GS owners.
Haven't upgraded to iOS 4 yet? The free iOS 4.0.1 Software Update brings over 100 new features to your iPhone. Here are a few.
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.
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