IOS 5

iOS 5, codenamed "Telluride", was the 5th major release of iOS designed and distributed by Apple for supported iPhone, iPad, and iPod touch models. It was announced on June 6 at WWDC 2011 alongside Mac OS X Lion, before being released to the general public on October 12, 2011.

New features

 * Notification Center
 * iMessage
 * Newsstand
 * Reminders
 * Integration
 * Can play content while device is syncing with iTunes
 * Group by Album Artist option in Music
 * Shortcut to Camera from Lockscreen
 * Able to flag emails
 * Reading List in Safari
 * Search within a web page (iPad 2 only)
 * Private Browsing
 * iCloud
 * PC Free
 * FaceTime without a SIM (iPhone only)
 * Siri (iPhone 4S only)
 * Hide keyboard (iPad only)
 * Tabbed Browsing (iPad only)

Trivia

 * iOS 5 is the initial release on the iPhone 4S.
 * iPhone 3G and 2nd generation iPod Touch were not supported on this release, due to that 4.2.1 is the last version of the respective devices.
 * The first iPad and iPod touch (3rd generation) had limited support.
 * iPhone 3GS, iPhone 4, iPhone 4S, iPod touch (4th generation), iPad 2 and iPad 3 were all fully supported.
 * This is the first iOS version to feature Music and Newsstand.
 * This is the first iOS version to introduce Siri (iPhone 4S and higher are recommended).
 * This is the first iOS version to feature the "swipe up to camera" function.
 * This is the last iOS version to use the original Settings icon.

Release history

 * iOS 5.0 (October 12, 2011)
 * iOS 5.0.1 (November 10, 2011)
 * iOS 5.1 (March 7, 2012)
 * iOS 5.1.1 (May 7, 2012)