iOS 4 is a free upgrade available to existing users of iPhone 3G, 3GS (Note: iOS 4 is not available for the original iPhone device). Upgrade to iOS 4 brings new features and functionality to your iPhone 3G and 3GS. However, not all features work on iPhone 3G and few features have exclusive usage on iPhone 3GS devices.
iOS 4 features for iPhone 3G
Following iOS 4 features should work on your existing iPhone 3G device.
1. Home screen Folders
2. Unified Inbox and threading for Mail
3. Internet tethering
iOS 4 features for iPhone 3GS
Following iOS 4 features should work on your existing iPhone 3GS device.
1. Home screen Folders
2. Unified Inbox and threading for Mail
3. Internet tethering
4. Multitasking
5. Bluetooth keyboard support
6. Home screen wallpaper
7. Data protection
