iOS 5.1

This update contains improvements and bug fixes, including:
• Japanese language support for Siri (availability may be limited during initial rollout)
• Photos can now be deleted from Photo Stream
• Camera shortcut now always visible on Lock Screen for iPhone 4S, iPhone 4, iPhone 3GS and iPod touch (4th generation)
• Camera face detection now highlights all detected faces
• Redesigned Camera app for iPad
• Genius Mixes and Genius playlists for iTunes Match subscribers
• Audio for TV programmes and films on iPad optimised to sound louder and clearer
• Podcast controls for playback speed and a 30-second rewind for iPad
• Addresses bugs affecting battery life
• Fixes an issue that occasionally caused audio to drop for outgoing calls

For information on the security content of this update, please visit this website:
http://support.apple.com/kb/HT1222

Baseband Changes:
iPhone 3GS: 05.16.05
iPhone 4 (GSM): 04.12.01
iPhone 4 (CDMA): 3.0.04
iPhone 4S:     2.0.10
iPad Wi-Fi + 3G: 07.11.01
iPad 2 Wi-Fi + GSM: Unknown…
iPad 2 Wi-Fi + CDMA: Unknown…

iPhone iOS 5.1| iPhone 3GS | iPhone 4 (GSM) | iPhone 4 (CDMA) | iPhone 4S |
iPod Touch iOS 5.1 | iPod Touch 3rd Gen | iPod Touch 4th Gen | iPod Touch 4.5/5th Gen |
iPad iOS 5.1 | iPad Original | iPad 2 (Wi-Fi) | iPad 2 (Wi-Fi+GSM) | iPad 2 (Wi-Fi+CDMA) |
Unknown | iPad2,4 | iPad3,1 | iPad3,2 | iPad3,3 |