Some of the new features in the 4.0 iPhone OS are:
- Multitasking (Double-Tap home button, you can run up to 4 apps simultaneously)
- BlueTooth Keyboard
- 5X Digital Zoom
- Change Homescreen wallpaper
- SMS Reminders
- Sync IMAP Notes
- Tap-to-Focus Video
- Web Search Suggestions
- Find & Delete Mail Search
- Larger Fonts for Mail
- Wake on Wireless
- Changeable image size in mail messages
- Background Audio
- VoIP (AT&T is going to hate Skype)
- Background location
- Local Notifications
- Faster App Switching
- Enhanced Mail Application
- Can have 2,160 apps installed instead of 180
- iBooks for the iPhone (With Free Winnie The Pooh)
- In-App encryption
- Game Centre
- MultiPlayer Matchmaking & Invite Friends Option
Incompatible with 1st gen iDevices, 2nd gen will have limited features.
Woah, they even changed some of the icons for the default apps.
Pandora radio is now fully background-aware so you can exit the app and still listen to music!
Multitask with 4 different apps at once! Amazing
Skype behaves just like your standard calling in the new OS! Same style notifications too (Note: You can also receive skype calls when your phone is locked) You can also exit the app and run another one, just like standard calling.
The enhanced mail application has a unified inbox & better searching
*Folders is just like categories for those of you that have jailbroken your iPhone/iPod Touch
NOTE: iPod Touch users still have to pay, free for iPhone users