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In case you missed it, Gizmodo has provided some more secrets for the iPhone 4.0 software which will be released in June 2010.
The discovered features include:
Email Threading (similar to what you see in Gmail)
Unified Inbox which can bring different email accounts or social network messages into one inbox and is configuratble
Cellular Data On/Off Switch under settings
SMS character count – This was previously only available under jailbroken phones
SMS Search
Changing the Background of your Home Screen
Digital Zoom on your iPhone Camera
Wikipedia and Web search from Spotlight
Document Preview without borders
Simplified New Contact Screen
iPhoto Events, Places and Faces under Photos
Lyrics option for your songs
Built in Spelcheck
Photo Resize when emailing
Album art in Album view
Location services App-specific
Multiplayer Game option under Game Centre
Creating Folders for your Apps
Contact pictures when viewing emails
Birthday Calendar (This is a great great new feature for me)
Bluetooth Keyboard pairing
SMS failure notification
Video Playback inside webpages
Viste iPhone Video Tutorials
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