- Multitasking — A combination of persistent-state applications and backgrounding functions for certain services. The end result means better battery performance when doing things like listening to Pandora while browsing the web.
- Folders — Organizing your iPhone Home Screen is easier now that you can use folders to store groups of apps in one icon. This is a huge time-saver and makes finding and keeping more apps on your device much easier.
- iBooks — First appearing on the iPad, iBooks is now available for iPhone users. Just like the Kindle app, your purchases and page marks are synchronized across devices.
- Tap to Focus Video — iPhone 3GS owners can now tap to focus their videos just like you can when taking still shots. The new software also includes a 5x digital zoom for the built-in camera.
- Bluetooth Keyboard Support – You can now pair your iPhone with a Bluetooth keyboard, which will make typing long documents much easier.
- Better Spell Check – The spell check utility now works across Mail, Notes, Safari and other apps.
- You can unlock the iOS4 with the latest version of ultrasn0w (Read More)
- Jailbreak iOS4 with sn0wbreeze (Read More), it will be releasing soon!
Download the latest iOS4 (Mirror) : http://techulus.com/iblog/2010/06/21/download-ios4-mirror-links/











