The latest firmware gives you the possibility to apply the latest improvements to your device.

What's New:

Personal Hotspot:
- Share iPhone 4 cellular data connection with up to 5 devices (combination of up to 3 Wi-Fi, 3 Bluetooth, and 1 USB)

iTunes Home Sharing:
- Play music, movies and TV shows from a shared iTunes library on a Mac or PC (requires iTunes 10.2)

New AirPlay features:
- Play videos from the Photos app including the Camera Roll album, iTunes previews, enabled third-party apps and websites on Apple TV
- Play slideshows from Photos on Apple TV using transitions available on Apple TV

- Faster Safari performance with Apple Nitro JavaScript engine

HD video out using the Apple Digital AV Adapter:
- View 720p HD videos from Videos app, iPod app, Photos, YouTube, Safari, Keynote, and enabled third-party apps on an HDMI display

Ping features:
- Push notifications for comments and follow requests
- Post and Like songs directly from the Now Playing screen
- Parental controls

New Settings:
- Messages setting for number of times to repeat an alert
- iPad side switch setting to lock screen rotation or mute audio notifications and sound effects
- Single tap conference call dialing with a pause to send a passcode
- Bug fixes