iPhone OS 4 was announced on Thursday, and its got a lot of great new features:
Multitasking
- You can now multitask between apps. The UI is very well designed and is accessed by double tapping the home button.
- Audio apps like Pandora can now continue to play in the background.
- VOIP apps such as Skype can receive calls when you’re doing something else, and you can switch to another app without dropping a call.
- Apps can now receive notifications when your location changed which are triggered when you change cell towers.
- Apps can now display local notifications which are like push notifications but are generated locally by the app.
Folders
- You can now create folders on the home screen which allow you to group apps however you like. This is a great feature which has been needed for a long time!
- You can put folders in the dock.
Wallpaper
- You can now change the wallpaper for the home page and the lock screen.
- Unified inbox. Messages from multiple accounts now appear in one inbox.
- Organize messages by thread.
- Open attachments.
iAd
- Developers can easily add ads to their apps and earn 60% of the revenue.
- Users access interactive ads within apps and can return to the app where they left off.
Other Stuff
- iBooks is now available on iPhone
