iOS 4.3 Software Update
This update contains new features and improvements, including the following:
• 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
Products compatible with this software update:• iPhone 4 (GSM model)• iPhone 3GS• iPad• iPod touch (4th generation)• iPod touch (3rd generation)
*Requires iPhone 4 with tethering data plan**Requires Apple TV (2nd generation) running software    version 4.2 or later***iPhone 4, iPad, iPod touch (4th generation)
For information on the security content of this update, please visit:  <https://support.apple.com/kb/HT1222>