iOS 4

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iOS 4
A version of the iOS operating system
IOS4 logo.png
IOS 4 Homescreen.png
iOS 4 running on an iPhone 4.
Developer Apple Inc.
Source model Closed, with open source components
Initial release June 21, 2010; 6 years ago (2010-06-21)
Latest release
iPhone 3G, iPod Touch (2nd generation)

4.2.1 (November 22, 2010; 6 years ago (2010-11-22)) [±]

iPhone 4 (CDMA)

4.2.10 (July 25, 2011; 5 years ago (2011-07-25)) [±]

iPhone 3GS, iPhone 4 (GSM), iPod Touch (3rd generation), iPod Touch (4th generation), iPad (1st generation), iPad 2
4.3.5 (July 25, 2011; 5 years ago (2011-07-25)) [±]
Kernel type Hybrid (XNU)
License Proprietary EULA except for open-source components
Preceded by iPhone OS 3
Succeeded by iOS 5
Official website iOS 4 at the Wayback Machine (archived June 30, 2010)
Support status
Unsupported as of about 2013[citation needed]

iOS 4 is the fourth major release of the iOS mobile operating system designed by Apple Inc., being the successor to iPhone OS 3. It was released on June 21, 2010, and was the first major release to be renamed to simply "iOS", and the first major release to drop support for some devices, as well as the first update that iPod Touch users did not have to pay for.[1][2] iOS 4 was succeeded by iOS 5, which was released on October 12, 2011.


Further information: iOS version history § iOS 4

Introduction and initial release[edit]

iOS 4 was introduced during the annual Apple Worldwide Developers Conference on June 7, 2010 together with the iPhone 4. With the release of the first-generation iPad earlier that year, the company renamed iPhone OS to iOS to reflect the entire family of devices.[2] iOS 4.0 supported only the iPhone and iPod touch at launch, but later added iPad support.[1] It also added over 1500 new APIs for developers, including the highly anticipated multitasking feature.



iOS 4.0.1 was released on July 15, 2010, as the first update to iOS 4. The update has an updated carrier signal strength display, along with other bug fixes.


iOS 4.0.2 was released on August 11, 2010, with a fix for an PDF exploit that allowed jailbreaking on Safari.


iOS 4.1 was released on September 8, 2010. The update included a technology known as HDR for better photos and to better the quality. It also introduced Game Center, along with high definition videos, where it can be shared on YouTube or MobileMe. It was the first version of iOS available on the Apple TV (2nd generation).[3]


iOS 4.2.1 was released on November 22, 2010. It was the first version to bring major feature parity to the iPhone and iPad.[4][5] It was also the last to support the iPhone 3G and iPod Touch (2nd generation, MB & MC models).


iOS 4.2.5 was released on February 7, 2011. It includes support for the CDMA version of iPhone 4.[6]

4.2.6 - 4.2.10[edit]

iOS 4.2.6 - 4.2.10 are the set of updates which was released in each dates for the CDMA version of iPhone 4. Along with iOS 4.2.5, it includes bug fixes, and security updates in each of the updates.


iOS 4.3 was released on March 9, 2011. The update included support for Personal Hotspot, iTunes Home Sharing, improvements on AirPlay, and some minor improvements.[7] IOS 4.3.x did not support the CDMA iPhone 4.


iOS 4.3.1 was released on March 25, 2011, with a fix on iPod Touch screen glitches, along with baseband updates for iPhone 3GS, and the first-generation iPad.[8]


iOS 4.3.2 was released on April 14, 2011, with fixes on frozen calls on FaceTime and connectivity issues on cellular models of iPad.[9]


iOS 4.3.3 was released on May 4, 2011, to patch location bugs.[10]


iOS 4.3.4 was released on July 15, 2011, Re-introducing the ability to cancel and delete apps that are currently downloading, and preventing from jailbreaking and hacking.[11]


iOS 4.3.5 was released on July 25, 2011, with a security update to fix certificate validation.[12]


Home Screen[edit]

iOS 4 raised the maximum number of home screen apps from 180 to 2160 due to the addition of folders. These folders would automatically be named based on the containing apps' respective App Store category. The ability to add custom wallpapers to the home screen was also added (not supported on iPhone 3G and 2nd generation iPod Touch).[13] The dock was also redesigned to be more reflective and match that of Mac OS X 10.5-10.6.


iOS 4 introduced Multitasking. It allows user to switch between the apps instantly by double clicking the home button. It was implemented in such a way that did not cause excessive battery drain or a large performance hit. Multitasking is limited to VoIP and GPS apps and audio listening only.[1][14] The iPhone 3G and 2nd generation iPod Touch lack multitasking capabilities because of hardware limitations.


Main article: iBooks

iBooks, the app that is included on iPad, is now on iPhone and iPod Touch with the release of iOS 4. Though not a built-in app, it is free on App Store.[15]


The Mail app gets a unified inbox on iOS 4, allowing users to see messages from all of their email accounts displayed together in a single inbox.[15][16] It also gained support for MobileMe e-mail aliases and multiple Exchange accounts for business and Enterprise users.[1]

Game Center[edit]

Main article: Game Center

iOS 4.1 added a new app called Game Center, an online multiplayer social gaming network, which allows users to invite friends to play the game and to compare their scores on a leaderboard.[14] It was not available on the iPhone 3G.


iOS 4 introduced FaceTime, a videotelephony app which uses the device's camera to allow the user to make video calls.[17][18][19] It is done by clicking the FaceTime button during a phone call or directly from the app. It required a Wi-Fi connection to work at the time. It worked on the iPhone 4 or later, iPod Touch (4th Generation) or later, iPad 2 or later, and Mac (Mac OS X 10.6 or later).

Other new features[edit]


iOS 4 added support for Apple Bluetooth Keyboards on iPhone 3GS, iPhone 4 and 3rd Generation iPod Touch.


The Safari mobile browser on iOS 4 added Bing as a search option in addition to Google and Yahoo!. A unified "Search" keyboard button was added when the search field was being used.[20]

Specific words or phrases on a page can searched.[21] This is done with the "On This Page" feature.[22]

Spell Check[edit]

iOS 4 introduces a spell check feature that will underline misspelled words in red. Tapping on the word will give a popup which has a recommended replacement and tapping on the popup will replace the word with the recommended replacement.[15]


The camera app could now take pictures with 5 times digital zoom.[23]


iPhone 3G users reported performance and battery issues after they updated to the latest software.[24][25] As a result, Apple released iOS 4.1 and 4.2.1 in attempt to fix the performance issues.

Some iPhone 4 users have reported technical problems with the antennas.[26] Some carriers sued for smartphone’s defective antenna design which drops calls and has a weak signal.[27] It became known as antennagate.[28] Later, Apple eventually released iOS 4.0.1 and the CDMA Verizon iPhone 4 in attempt to fix the problem.

Supported devices[edit]

The 1st generation iPhone and the 1st generation iPod Touch cannot run iOS 4 and above due to hardware limitations.[1]


  1. ^ a b c d e "iOS 4: What you need to know". Macworld. Retrieved October 29, 2016. 
  2. ^ a b Chartier, David (Jun 7, 2010). "iPhone OS gets new name, video calling". MacWorld. Retrieved 2016-08-20. 
  3. ^ "About Apple TV (2nd generation) software updates". December 14, 2010. Retrieved January 9, 2011. 
  4. ^ "Apple releases iOS 4.2.1". Macworld. Retrieved October 29, 2016. 
  5. ^ "Apple - Press Info - Apple's iOS 4.2 Available Today for iPad, iPhone & iPod touch". Retrieved 2016-10-29. 
  6. ^ "Apple's new CDMA iPhone has built-in Wi-Fi hotspot with iOS 4.2.5". AppleInsider. Retrieved December 28, 2016. 
  7. ^ "iOS 4.3 brings a handful of new features and new headaches". Engadget. Retrieved December 28, 2016. 
  8. ^ "iOS 4.3.1 fixes iPod touch graphics glitch, TV flickering issue". Ars Technica. Retrieved December 28, 2016. 
  9. ^ "Apple releases iOS 4.3.2, fixes FaceTime, 3G issues". Macworld. Retrieved December 28, 2016. 
  10. ^ "Apple releases iOS 4.3.3 to patch location bugs". Macworld. Retrieved December 28, 2016. 
  11. ^ White, Charlie. "Apple iOS 4.3.4 Update Available, Prevents Hacking & Jailbreaking". Mashable. Retrieved December 28, 2016. 
  12. ^ "Apple releases iOS 4.3.5 to fix certificate validation". Macworld. Retrieved December 28, 2016. 
  13. ^ "Hands on with iOS 4 folders". Macworld. Retrieved 2016-10-29. 
  14. ^ a b "What's New in iOS 4". Apple. Retrieved June 14, 2010. 
  15. ^ a b c "iOS 4 review". iMore. Retrieved 2016-12-19. 
  16. ^ Herrman, John. "iPhone OS 4.0: The Best New Features". Gizmodo. Retrieved December 28, 2016. 
  17. ^ "SANS Institute InfoSec Reading Room". Retrieved January 1, 2016. 
  18. ^ "How to Use FaceTime on iPhone 4.0 and iOS5, iOS4". iSmashPhone. 2010-06-24. Retrieved 2017-01-01. 
  19. ^ Mostafa, Golam (2010-06-08). "New Feature of iOS 4 "FaceTime Video Conferencing" coming". The Tech Journal. Retrieved 2017-01-01. 
  20. ^ "Bing & Yahoo Prompting iPhone Users To Switch Search Engines". Search Engine Land. 2010-06-24. Retrieved 2016-10-29. 
  21. ^ "iOS 4.2 features: Find text on Safari web page". iMore. Retrieved 2017-02-08. 
  22. ^ "Search for Text in Safari with iPhone Find on Page". Lifewire. Retrieved 2017-02-08. 
  23. ^ "Apple iOS 4: 10 Best Features". PCWorld. Retrieved 2017-01-01. 
  24. ^ Ogg, Erica (July 28, 2010). "Apple to investigate iOS 4 problems on iPhone 3G". CNET. 
  25. ^ Ogg, Erica (November 4, 2010). "Apple sued for iOS 4 problems on iPhone 3G, 3GS". CNET. 
  26. ^ Chen, Brian X. "Tests Confirm iPhone 4's Antenna Flaws (Updated)". WIRED. Retrieved 2016-10-29. 
  27. ^ Staff, Computerworld. "Apple, AT&T Sued Over iPhone 4 Antenna Problems". WIRED. Retrieved 2016-10-29. 
  28. ^ "Apple's iPhone 4 Antennagate Timeline". PCWorld. Retrieved January 2, 2017. 

External links[edit]

Preceded by
iPhone OS 3
iOS 4
June 2010
Succeeded by
iOS 5