IOS 4

iOS 4 "Apex" was the 4th major release of iOS for the iPhone, iPod touch and iPad. It was for the iPhone (3G and 3GS) along with being available for the iPod Touch (2nd & 3rd Gen). The update was free and included a multitude of new features. The features included, but were not limited to:


 * Multitasking
 * Folder Organisation
 * Multiple Mail Boxes
 * iBooks
 * support for iMovie (available in the App Store)
 * Creation of Playlists
 * 5x Digital Zoom for Camera (iPhone 4 and iPod Touch 4G)
 * LED flash (iPhone 4 only)
 * Tap-Focus for video
 * Picture Identification
 * Homescreen Wallpaper
 * Ability to 'Gift' Apps
 * Spell Check
 * Bluetooth Keypad
 * Ability to rent movies
 * Game Center
 * FaceTime (iPod Touch 4G and iPhone 4 only)
 * Personal hotspot

The iOS 4 round of updates had finished, it stated with iOS 4.0 and concluded with 4.3.5, which was released on July 25th 2011, it was preceded with the iOS 5 round of updates with iOS 5.0 being released on 12th October 2011.

Discontinuation
iOS 4 was still supported for a limited time from June 6, 2011, to October 10, 2011. Apple made it unsupported to release iOS 5 (iOS's 5th and next level), having released 5.0 on October 12, 2011. All services were moved to iOS 5 and iCloud.

Support

 * The 1st generation iPhone and iPod touch were not supported in this release.
 * The iPhone 3G and 2nd generation iPod touch had limited support.
 * All the iPads, 3rd and 4th generation iPod touch, iPhone 3GS, and iPhone 4 were all fully supported

Info

 * Release:       June 24, 2010
 * Expiration:    October 12, 2011
 * Status:        Inactive
 * Support status: Unsupported

Support ending
iOS 4's support was ending as of October 4, 2011. iPhone 3GS, iPhone 4, iPod touch (4th generation), iPad 2 Wi-Fi and iPad 2 Wi-Fi + 3G were concerned that iOS 5 was going to come and be an update. Soon, iOS 4 was completely unsupported. Its features were moved to iOS 5. (See List of unsupported firmware)

Trivia

 * Initial release on iPhone 4.
 * Initial release on iPod touch (4th generation).
 * This was the 1st release to drop support for some devices.
 * Recent version was un-available for the CDMA version of the iPhone 4.