iOS 4

The iOS 4 is an operating system that was designed and developed especially for iPhone and iPad by Apple from 2010 to 2011. The system has been released on June 21, 2010, and was preinstalled on the iPhone 4, iPod touch 4th Generation, iPad 2, and Apple TV 2nd Generation.

This software gets the last update (4.3.5) on July 25, 2011, and later has been replaced by a newer version of iOS 5.

The new operating system introduced folders on the home screen, significantly increasing the number of apps that can be displayed. Support for custom wallpapers was also added, although limited to newer devices due to animation performance requirements.

The operating system also added a multitasking feature, letting apps dealing with Internet calling, location, and audio playback function in the background, whereas a similar but more restricted “Fast App Switching” technology enabled any app to be left inactive in the background while users switch to other apps.

iOS 4 also added a system-wide spell-checking feature, enabled iBooks on iPhone, unified the Mail inbox to combine content from different email providers, and introduced both Game Center for social gaming and FaceTime for video calling.

Today iOS 4 is 13 years old!

iOS 4
Source: – iOS 4

iOS 4 General Information

ReleasedJune 21, 2010
Original PriceFree
System RequirementsiPhone 3G
iPhone 3Gs
iPhone 4
iPod touch 2nd Generation
iPod touch 3rd Generation
iPod touch 4th Generation
iPad 2
Apple TV 2nd Generation
Apple TV Software Update


VersionsBuildRelease Date
iOS 4.08A293June 21, 2010
iOS 4.0.18A306July 15, 2010
iOS 4.0.28A400August 11, 2010
iOS 4.18B117September 8, 2010
iOS 4.28C150November 22, 2010
iOS 4.2.18C148
November 22, 2010
iOS 4.2.5 (iPhone 4 CDMA)8E128January 11, 2011
iOS 4.2.6 (iPhone 4 CDMA)8E200January 31, 2011
iOS 4.38F190
March 4, 2011
iOS 4.3.18G4March 25, 2011
iOS 4.2.7 (iPhone 4 CDMA)8E303April 14, 2011
iOS 4.3.28H7
April 14, 2011
iOS 4.2.8 (iPhone 4 CDMA)8E401May 4, 2011
iOS 4.3.38J2
May 4, 2011
iOS 4.2.9 (iPhone 4 CDMA)8E501July 15, 2011
iOS 4.3.48K2July 15, 2011
iOS 4.2.10 (iPhone 4 CDMA)8E600July 25, 2011
iOS 4.3.58L1July 25, 2011

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