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IOS 4#4.2.1

{{Short description|2010 mobile operating system}}

{{Use mdy dates|date=November 2013}}

{{lowercase title}}

{{Infobox OS version

| name = iOS 4

| version of = iOS

| logo = IOS4 logo.png

| logo_size = 131px

| screenshot = IOS 4 Homescreen.png

| screenshot_size = 258px

| caption = iOS 4.1 home screen on an iPhone 3GS

| developer = Apple Inc.

| website = {{webarchive|url=https://web.archive.org/web/20100630155749/http://www.apple.com/iphone/softwareupdate |date=June 30, 2010 |title=Apple – iPhone – New features in the iOS 4 Update}}

| source_model = Closed, with open source components

| license = Proprietary EULA except for open-source components

| kernel_type = Hybrid (XNU)

| released = {{Start date and age|2010|6|21}}

| first_release_url =

| release_url =

| preceded_by = iPhone OS 3

| succeeded_by = iOS 5

| preview_version =

| preview_date =

| preview_url =

| sales =

| update model = iTunes through a computer

| package manager = App Store

| support_status = Obsolete, unsupported.{{Citation needed|reason=Find exactly when App Store support was discontinued.|date=December 2023}} Drops support for the iPhone (1st generation), iPod Touch (1st generation).

| supported_platforms = iPhone, iPod Touch, iPad

}}

iOS 4 is the fourth major release of the iOS mobile operating system developed by Apple Inc., being the successor to iPhone OS 3. It was announced at the Apple Special Event on April 8, 2010, and released on June 21, 2010. iOS 4 was the first version branded as "iOS" rather than "iPhone OS",{{cite news |title=iPhone OS 4 renamed iOS 4, launching June 21 with 1500 new features |url=https://www.engadget.com/2010-06-07-iphone-os-4-renamed-ios-gets-1500-new-features.html |access-date=18 November 2023 |work=Engadget |date=7 June 2010}} due to the release of the iPad. It was succeeded by iOS 5 on October 12, 2011.{{cite web |first=Devindra |last=Hardawar |title=iOS 5 available now, makes the iPhone 4 feel completely new |url=https://venturebeat.com/2011/10/12/ios-5-available/ |website=VentureBeat |date=October 12, 2011 |access-date=July 15, 2017 |archive-date=February 7, 2017 |archive-url=https://web.archive.org/web/20170207033452/http://venturebeat.com/2011/10/12/ios-5-available/ |url-status=live }}

iOS 4 introduced many features that have since become commonplace, such as folders on the home screen, significantly increasing the number of apps that can be displayed. Support for home screen wallpapers on the iPhone 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.

The iOS 4 update introduced performance and battery problems on iPhone 3G devices, with Apple investigating the matter and promising then-upcoming updates. However, the company became the subject of a lawsuit from an unsatisfied customer over the issues. Around the same time, the release of iPhone 4 and its subsequent antenna problems made Apple focus on unsuccessfully attempting to patch the issues with software updates.

iOS 4 is the final version of iOS that features the iPod app for music and videos on iPhones and iPads. Starting with iOS 5, iPhones and iPads do not have the iPod app, but instead have the Music and Videos apps, as the iPod Touch does. It is also the last version of iOS that supports the iPhone 3G and second-generation iPod Touch, up to version 4.2.1 (4.3 dropped support for both devices), due to hardware limitations and performance issues.

Apps

History

iOS 4 was introduced at the Apple Special Event on April 8, 2010. At the WWDC keynote address on June 7, 2010, it was named iOS 4 and not iPhone OS 4 in order to be more inclusive to the iPod Touch and iPad.{{cite web |first=Nilay |last=Patel |title=iPhone OS 4 renamed iOS 4, launching June 21 with 1500 new features |url=https://www.engadget.com/2010/06/07/iphone-os-4-renamed-ios-gets-1500-new-features/ |website=Engadget |publisher=AOL |date=June 7, 2010 |access-date=July 15, 2017 |archive-date=June 14, 2017 |archive-url=https://web.archive.org/web/20170614180843/https://www.engadget.com/2010/06/07/iphone-os-4-renamed-ios-gets-1500-new-features/ |url-status=live }}

iOS 4 was officially released on June 21, 2010.

System features

= Home screen =

iOS 4 added folders to hold a group of app. It would automatically be named based on the containing apps' respective App Store category, but could be customized to whatever the user wants. It also raises the screen limit to 15. With both of these changes, the maximum number of home screen icons possible is raised from only 180 to 2,160.{{cite web |first=Dan |last=Frakes |title=Hands on with iOS 4 folders |url=http://www.macworld.com/article/1152168/ios4folders.html |website=Macworld |publisher=International Data Group |date=June 21, 2010 |access-date=July 15, 2017 |archive-date=July 3, 2017 |archive-url=https://web.archive.org/web/20170703204429/http://www.macworld.com/article/1152168/ios4folders.html |url-status=live }}

= Multitasking =

iOS 4 introduced multitasking, replacing the home button shortcuts feature which had a similar albeit more limited function and only supported 1st party apps. It allows users to switch between apps instantly by clicking the home button two times. It was implemented in such a way that did not cause excessive battery drain. Multitasking was limited to apps dealing with Internet calling, location, and audio playback, while a similar "Fast App Switching" technology meant users could leave an app and enter another, with the original app remaining in the background until the user returns.{{cite web |title=iOS 4: What you need to know |url=http://www.macworld.com/article/1152167/ios4_need_to_know.html |website=Macworld |publisher=International Data Group |date=June 21, 2010 |access-date=July 15, 2017 |archive-date=May 10, 2017 |archive-url=https://web.archive.org/web/20170510170129/http://www.macworld.com/article/1152167/ios4_need_to_know.html |url-status=live }}{{cite web |first=Jared |last=Newman |title=Multitasking With iOS 4 is Horrible: Apple Blew It |url=http://www.pcworld.com/article/199528/Multitasking_With_iOS_4_is_Horrible_Apple_Blew_It.html |website=PC World |publisher=International Data Group |date=June 22, 2010 |access-date=July 15, 2017 |archive-date=June 29, 2013 |archive-url=https://web.archive.org/web/20130629185931/http://www.pcworld.com/article/199528/Multitasking_With_iOS_4_is_Horrible_Apple_Blew_It.html |url-status=live }} This feature was notably absent from iPhone 3G and the second-generation iPod Touch due to performance issues.

iOS 4 introduced a spell checking feature that underlined misspelled words in red. Tapping on the word would provide a pop-up with a recommended replacement.{{cite web |first=Rene |last=Ritchie |title=iOS 4 features: Spell-check and text replace |url=https://www.imore.com/ios-4-features-spellcheck-text-replace |website=iMore |date=July 13, 2010 |access-date=July 15, 2017 |archive-url=https://web.archive.org/web/20180510185141/https://www.imore.com/ios-4-features-spellcheck-text-replace |archive-date=May 10, 2018 |url-status=dead }}

= Camera =

The Camera app now supports 5x digital zoom.{{cite web |first=Daniel |last=Ionescu |title=Apple iOS 4: 10 Best Features |url=http://www.pcworld.com/article/199431/apple_ios4_10_best_features.html#slide10 |website=PC World |publisher=International Data Group |date=June 21, 2010 |access-date=July 15, 2017 |archive-date=May 10, 2017 |archive-url=https://web.archive.org/web/20170510211624/http://www.pcworld.com/article/199431/apple_ios4_10_best_features.html#slide10 |url-status=live }}

= Apps =

The Mail app featured a unified inbox on iOS 4, allowing users to see messages from all of their email accounts displayed together in a single inbox.{{cite web |first=Rene |last=Ritchie |title=iOS 4 review |url=https://www.imore.com/ios-4-review |website=iMore |date=June 14, 2010 |access-date=July 15, 2017 |archive-date=June 15, 2018 |archive-url=https://web.archive.org/web/20180615111736/https://www.imore.com/ios-4-review |url-status=live }} It also gained support for MobileMe e-mail aliases and multiple Exchange accounts for business users.

iOS 4.1 added a new app called Game Center, an online multiplayer social gaming network, which allows users to invite friends to play games and to compare their scores on a leaderboard.{{cite web |first=Chris |last=Holt |title=iOS 4.1's Game Center to hit iPhone next week |url=http://www.macworld.com/article/1153821/software-games/ios-gamecenter.html |website=Macworld |publisher=International Data Group |date=September 1, 2010 |access-date=July 15, 2017 |archive-date=January 15, 2018 |archive-url=https://web.archive.org/web/20180115215752/https://www.macworld.com/article/1153821/software-games/ios-gamecenter.html |url-status=live }}{{cite web |first=Christopher |last=Grant |title=Download iOS 4.1 now, get Game Center (on your compatible iProduct) |url=https://www.engadget.com/2010/09/08/download-ios-4-1-now-get-game-center-on-your-compatible-iprodu/ |website=Engadget |publisher=AOL |date=September 8, 2010 |access-date=July 15, 2017 |archive-date=May 10, 2018 |archive-url=https://web.archive.org/web/20180510185658/https://www.engadget.com/2010/09/08/download-ios-4-1-now-get-game-center-on-your-compatible-iprodu/ |url-status=live }} It was not available on the iPhone 3G.

= FaceTime =

iOS 4 introduced FaceTime, a videotelephony app that uses the device's camera to allow the user to make video calls with other FaceTime users.{{cite web |first=Luke |last=Dormehl |title=Today in Apple history: iOS 4 brings multitasking and FaceTime |url=https://www.cultofmac.com/488032/today-apple-history-ios-4-facetime-multitasking/ |website=Cult of Mac |date=June 21, 2017 |access-date=July 15, 2017 |archive-date=June 22, 2017 |archive-url=https://web.archive.org/web/20170622130759/https://www.cultofmac.com/488032/today-apple-history-ios-4-facetime-multitasking/ |url-status=live }} This feature was absent from the iPhone 3G, second-generation iPod Touch, iPhone 3GS, and third-generation iPod Touch due to the lack of required features, such as a front-facing camera.

= Safari =

The Safari mobile web browser on iOS 4 added Bing as a search option in addition to Google and Yahoo!.{{cite web |first=Greg |last=Sterling |title=Bing Goes The iPhone |url=http://searchengineland.com/bing-comes-to-the-iphone-43753 |website=Search Engine Land |date=June 7, 2010 |access-date=July 15, 2017 |archive-date=July 29, 2017 |archive-url=https://web.archive.org/web/20170729085702/http://searchengineland.com/bing-comes-to-the-iphone-43753 |url-status=live }}

Beginning with iOS 4.2.1, specific words or phrases on a page could be searched.{{cite web |first=Rene |last=Ritchie |title=iOS 4.2 features: Find text on Safari web page |url=https://www.imore.com/ios-42-features-find-text-safari-web-page |website=iMore |date=September 16, 2010 |access-date=July 15, 2017 |archive-url=https://web.archive.org/web/20170312124653/http://www.imore.com/ios-42-features-find-text-safari-web-page |archive-date=March 12, 2017 |url-status=dead }}

=Features added on the iPhone inherited from other platforms=

On the iPhone, the ability to choose wallpapers and see them on the home screen was also added, and the iPad had its ones updated to be consistent, though the feature was notably absent from iPhone 3G and the second-generation iPod Touch due to poor performance of icon animations.{{cite web |first=Eric |last=Slivka |title=Steve Jobs on Lack of Custom Wallpapers in iOS 4 for iPhone 3G |url=https://www.macrumors.com/2010/06/22/steve-jobs-on-lack-of-custom-wallpapers-in-ios-4-for-iphone-3g/ |website=MacRumors |date=June 22, 2010 |access-date=July 15, 2017 |archive-date=August 1, 2017 |archive-url=https://web.archive.org/web/20170801125229/https://www.macrumors.com/2010/06/22/steve-jobs-on-lack-of-custom-wallpapers-in-ios-4-for-iphone-3g/ |url-status=live }}

The iPhone's dock was updated to be skeuomorphic, resembling a clear glass shelf as with the Dock on the iPad and in Mac OS X Leopard/Snow Leopard; some of the icons were updated to match.

iOS 4 introduced iPhone and iPod Touch support to iBooks, which was already included on the iPad; it was available through the App Store.{{cite web |first=John |last=Brownlee |title=iOS 4, iBooks for iPhone Now Available For Download |url=https://www.cultofmac.com/47634/ios-4-ibooks-for-iphone-now-available-for-download/ |website=Cult of Mac |date=June 21, 2010 |access-date=July 15, 2017 |archive-date=May 10, 2018 |archive-url=https://web.archive.org/web/20180510184500/https://www.cultofmac.com/47634/ios-4-ibooks-for-iphone-now-available-for-download/ |url-status=live }}

Problems

= Performance and battery issues =

iPhone 3G users reported performance and battery issues after upgrading to iOS 4. Apple started an investigation of the matter in July 2010.{{cite web |first=Erica |last=Ogg |title=Apple to investigate iOS 4 problems on iPhone 3G |url=https://www.cnet.com/news/apple-to-investigate-ios-4-problems-on-iphone-3g/ |website=CNET |publisher=CBS Interactive |date=July 28, 2010 |access-date=July 15, 2017 |archive-date=October 22, 2016 |archive-url=https://web.archive.org/web/20161022115202/https://www.cnet.com/news/apple-to-investigate-ios-4-problems-on-iphone-3g/ |url-status=live }} In November, Apple was sued for the issues, with an unsatisfied customer alleging "violating the Consumer Legal Remedies Act, unfair business practices, and false and deceptive advertising", with further allegations that Apple knew its software would cause problems on older models. Apple never responded to the allegations, but wrote in a reply to another unsatisfied customer in August 2010 that updates were "coming soon".{{cite web |first=Erica |last=Ogg |title=Slow iPhone 3G? iOS update could be on the way |url=https://www.cnet.com/news/slow-iphone-3g-ios-update-could-be-on-the-way/ |website=CNET |publisher=CBS Interactive |date=August 20, 2010 |access-date=July 15, 2017 |archive-date=May 10, 2018 |archive-url=https://web.archive.org/web/20180510185916/https://www.cnet.com/news/slow-iphone-3g-ios-update-could-be-on-the-way/ |url-status=live }}{{cite web |first=Erica |last=Ogg |title=Apple sued for iOS 4 problems on iPhone 3G, 3GS |url=https://www.cnet.com/news/apple-sued-for-ios-4-problems-on-iphone-3g-3gs/ |website=CNET |publisher=CBS Interactive |date=November 4, 2010 |access-date=July 15, 2017 |archive-date=May 10, 2018 |archive-url=https://web.archive.org/web/20180510185101/https://www.cnet.com/news/apple-sued-for-ios-4-problems-on-iphone-3g-3gs/ |url-status=live }}

= Alarm clock =

In all versions of iOS 4, the alarm clock in the clock app had a problem in DST when it would go off an hour too early or too late.{{cite news|url=https://www.telegraph.co.uk/technology/apple/8101945/Apple-iPhone-4-alarm-clock-bug-makes-scores-late-for-work.html |archive-url=https://ghostarchive.org/archive/20220112/https://www.telegraph.co.uk/technology/apple/8101945/Apple-iPhone-4-alarm-clock-bug-makes-scores-late-for-work.html |archive-date=January 12, 2022 |url-access=subscription |url-status=live|title=Apple iPhone 4 alarm clock bug makes scores late for work|first=Claudine|last=Beaumont|date=November 1, 2010|newspaper=The Daily Telegraph}}{{cbignore}}

= Antenna problems =

Upon its release, some iPhone 4 users reported having technical problems with the phone's antennas.{{cite web |first=Brian X. |last=Chen |title=Tests confirm iPhone 4's antenna flaws (Updated) |url=https://www.wired.com/2010/07/iphone-4-anandtech |website=Wired |publisher=Condé Nast |date=July 2, 2010 |access-date=July 15, 2017 |archive-date=May 10, 2017 |archive-url=https://web.archive.org/web/20170510195154/https://www.wired.com/2010/07/iphone-4-anandtech/ |url-status=live }} Apple attempted to fix the issue in software with iOS 4.0.1,{{cite web |first=Daniel Eran |last=Dilger |title=Death Grip hysteria may end Monday with iOS 4.01 |url=http://appleinsider.com/articles/10/06/25/death_grip_hysteria_may_end_monday_with_ios_4_01.html |website=AppleInsider |date=June 25, 2010 |access-date=July 15, 2017 |archive-date=November 13, 2017 |archive-url=https://web.archive.org/web/20171113031041/http://appleinsider.com/articles/10/06/25/death_grip_hysteria_may_end_monday_with_ios_4_01.html |url-status=live }} but failed to do so.{{cite web |first=Daniel |last=Ionescu |title=Apple's iPhone 4 Antennagate Timeline |url=http://www.pcworld.com/article/201297/apples_iphone_4_antenna_gate_timeline.html |website=PC World |publisher=International Data Group |date=July 17, 2010 |access-date=July 15, 2017 |archive-date=July 15, 2017 |archive-url=https://web.archive.org/web/20170715142545/http://www.pcworld.com/article/201297/apples_iphone_4_antenna_gate_timeline.html |url-status=live }}

Supported devices

iOS 4 drops support for the first-generation iPhone and first-generation iPod Touch due to hardware limitations, though the iPhone 3G did support iOS 4, despite it having the same processor as the first-generation iPhone. However, the iPhone 3GS and iPod Touch (3rd generation) has partial support, and the iPhone 3G and iPod Touch (2nd generation) have limited support.{{Efn|Multitasking, home screen wallpapers and Bluetooth keyboard support are not available on both the iPhone 3G and iPod Touch (2nd generation), while Game Center, Apple's gaming network, was available on the iPod Touch (2nd generation) but not on the iPhone 3G. FaceTime is not supported on iPhone 3G and 3GS, and the iPod Touch 2nd and 3rd generations.}}

{{col-begin}}

{{col-break}}

=iPhone=

{{col-break}}

=iPod Touch=

{{col-break}}

=iPad=

{{col-break}}

=Apple TV=

{{col-end}}

Version history

class="wikitable"

|+

!Version

!Build

!Codename

!Release date

!Notes

!Update type

style="text-align: center;"|4.0

|8A293

| rowspan="3" |Apex

|June 21, 2010

|Initial release for iPhone 4 GSM

  • Allows use of multiple Mail inboxes
  • Adds support for folders for app organization
  • Allows creation of music playlists
  • Introduces the iBooks app
  • Adds tap-to-focus in the Camera app
  • Allows uses of Bluetooth keyboards
  • Allows users to gift apps to other Apple IDs in the App Store, as long as those apps contained no fraudulent information
  • Adds spellcheck
  • iPhone 3GS and iPhone 4 only:
  • Adds support for multitasking
  • Adds support for setting a home screen wallpaper
  • iPhone 4 only:
  • LED flash for camera
  • 5x digital camera zoom
  • FaceTime

|Initial Release

style="text-align: center;"|4.0.1

|8A306

|July 15, 2010

|Only for iPhones

  • Changes the algorithm that displays cellular signal strength after Antennagate{{cite web |last=Chartier |first=David |date=July 15, 2010 |title=Apple releases iOS 4.0.1 with new iPhone signal formula |url=http://www.macworld.com/article/1152733/iOS4_0_1.html |access-date=July 15, 2017 |website=Macworld |publisher=International Data Group |archive-date=May 11, 2018 |archive-url=https://web.archive.org/web/20180511081735/https://www.macworld.com/article/1152733/iOS4_0_1.html |url-status=live }}
  • Fixes a bug with Microsoft Exchange accounts

|Bug Fixes

style="text-align: center;"|4.0.2

|8A400

|August 11, 2010

|

  • Fixes a bug that allowed a maliciously crafted PDF to lead to arbitrary code execution{{cite web |first=Steven |last=Sande |title=iOS 4.0.2 for iPhone/iPod Touch, iOS 3.2.2 updates available now |url=https://www.engadget.com/2010/08/11/ios-4-0-2-for-iphone-ipod-touch-ios-3-2-2-updates-available-now/ |website=Engadget |publisher=AOL |date=August 11, 2010 |access-date=July 15, 2017 |archive-date=May 10, 2018 |archive-url=https://web.archive.org/web/20180510184438/https://www.engadget.com/2010/08/11/ios-4-0-2-for-iphone-ipod-touch-ios-3-2-2-updates-available-now/ |url-status=live }}
  • Fixes a bug that allows code running as user to gain system privileges

Due to all these patches, JailbreakMe 2.0 stops working.

|Bug Fixes

style="text-align: center;"|4.1

|8B117
8B118{{efn|iPod Touch (4th generation) only}}

|Baker

|September 8, 2010

|Initial release on iPod Touch (4th generation)

  • Adds HDR photo capture support to the iPhone 4
  • Allows upload of high definition videos captured on the iPhone 4 to YouTube and MobileMe
  • Fixes a bug that allowed a maliciously crafted .tiff image to lead to arbitrary code execution{{cite web |first=Eric |last=Slivka |title=Apple Releases iOS 4.1 for iPhone and iPod Touch |url=https://www.macrumors.com/2010/09/08/apple-releases-ios-4-1-for-iphone-and-ipod-touch/ |website=MacRumors |date=September 8, 2010 |access-date=July 15, 2017 |archive-date=May 11, 2018 |archive-url=https://web.archive.org/web/20180511012651/https://www.macrumors.com/2010/09/08/apple-releases-ios-4-1-for-iphone-and-ipod-touch/ |url-status=live }}
  • Fixes a bug that allowed an attacker in a privileged network position to redirect FaceTime calls
  • Fixes multiple bugs that caused visiting a maliciously crafted website to lead to arbitrary code execution
  • Exclusive to iPhone 3GS, iPhone 4, and iPod touch (3rd generation):
  • Game Center, a service that allows syncing of game save data, achievements, and more. Game Center had previously been part of developer versions of iOS 4.{{cite web |last1=Kumparak |first1=Greg |title=iOS 4.1 brings a whole new look to Apple’s Game Center |url=https://web.archive.org/web/20100717040031if_/http://www.mobilecrunch.com:80/2010/07/14/ios-4-1-brings-a-whole-new-look-to-apples-game-center/ |website=MobileCrunch |publisher=TechCrunch |access-date=29 August 2023}}

|Feature Update

style="text-align: center;"|4.2

|8C134

|Unknown

|November 1, 2010{{cite web |date=November 1, 2010 |title=iOS 4.2 GM Download Available Now |url=https://osxdaily.com/2010/11/01/ios-4-2-gm-available-now/ |access-date=December 31, 2023 |website=OS X Daily }}

|

  • Adds AirPlay, allowing devices to stream audio or video to the Apple TV (1st generation)
  • Adds AirPrint, allowing devices to print wirelessly to some HP ePrint printers
  • Allows users to create a free MobileMe account to access Find My iPhone, which allows location tracking and remote locking or wiping of a device
  • Adds support for the iPad (1st generation)
  • Birthdays calendar does not display birthdays starting more than 77 years ago.
  • Fixes glitch that can let a user get into the Phone app while the phone is locked via "Emergency Call" by dialing a random number and quickly pressing the lock button after dialing that call.
  • Improved iPhone 3G and iPod Touch (2nd generation) performance.
  • Import .ics calendar files directly for events.
  • Improved battery performance.
  • Birthdays icon has been changed in the Calendar app.
  • Text search on web pages. (iPhone 3GS and iPod touch 3 and 4 only)
  • 2 new fonts for Notes in Settings (Helvetica and Chalkboard).

Added support for Chinese URL over Safari.

  • Added an indicator in the App Store which shows if an app supports Game Center.
  • Support for CoreMIDI.
  • YouTube voting.
  • Minor improvements in UI graphics.
  • New parental controls for deleting apps, changing mail accounts and location services. {{Cite web |date=2010-09-16 |title=iOS 4.2 packs new, improved YouTube, FaceTime features and more |url=https://web.archive.org/web/20210629224133mp_/https://appleinsider.com/articles/10/09/16/ios_4_2_packs_new_improved_youtube_facetime_features_and_more.html |access-date=2024-09-26 |website=AppleInsider |language=en}}
  • The font size of text in Calendar can now be changed in the Accessibility settings.

Fixes Voice over IP (VoIP) issues.

Find My iPhone location feature is free (iPhone 4, iPod Touch (4th generation), and iPad) running on iOS 4.2.1.

  • More than 30 new keyboards and dictionaries, including Arabic, Greek, and Hebrew.
  • New animation for Multitasking.

New bookmarks design (iPhone and iPod Touch only).

  • New Voice Memos icon.
  • Ability to initiate FaceTime calls from Voice Control. (iPhone 4 only)

FaceTime shortcut from Messages app (iPhone 4 only).

  • New text tone alerts (New and Original tone lists) (iPhone 4 only).

Ringer and alerts on/off switch (Settings > Sounds) for volume buttons (iPhone only).

  • Assign different text tone alerts to each contact.

|Feature Update

style="text-align: center;" |4.2.1{{efn|No public release of iOS 4.2 is available, due to an issue that impacted Wi-Fi functionality on the iPad.{{cite web |first=Dan |last=Moren |title=iOS 4.2 arrival near? All signs point to yes |url=http://www.macworld.com/article/1155691/ios42_waiting.html |website=Macworld |publisher=International Data Group |date=November 12, 2010 |access-date=July 15, 2017 |archive-date=December 11, 2017 |archive-url=https://web.archive.org/web/20171211160857/https://www.macworld.com/article/1155691/ios42_waiting.html |url-status=live }}}}

|8C148
8C148a{{efn|iPhone 3GS only}}

|Jasper

|November 22, 2010{{cite web |last=Caldwell |first=Serenity |date=November 18, 2010 |title=Apple releases iOS 4.2.1 GM to developers |url=http://www.macworld.com/article/1155831/ios_421.html |access-date=July 15, 2017 |website=Macworld |publisher=International Data Group |archive-date=December 10, 2017 |archive-url=https://web.archive.org/web/20171210232135/https://www.macworld.com/article/1155831/ios_421.html |url-status=live }}

|Last version of iOS to run on iPhone 3G and iPod Touch (2nd generation) due to hardware and performance issues.

  • Replaces iOS 4.2 as iOS 4.2 prevented Wi-Fi from working on the iPad (1st generation), iOS 4.2 was later pulled from public view

|Bug Fixes

colspan="6" |All devices except for iPhone 4 (CDMA)
style="text-align: center;" |4.3

|8F190
8F191{{efn|iPad 2 only}}

| rowspan="6" |Durango

|March 4, 2011

|Initial release on iPad 2

  • Adds personal hotspot to the iPhone 4 (GSM)
  • Introduces iTunes home sharing
  • Improves AirPlay{{cite web |last=Rawson |first=Chris |date=March 4, 2011 |title=iOS 4.3 brings a handful of new features and new headaches |url=https://www.engadget.com/2011/03/04/ios-4-3-brings-a-handful-of-new-features-and-new-headaches/ |access-date=July 15, 2017 |website=Engadget |publisher=AOL |archive-date=May 10, 2017 |archive-url=https://web.archive.org/web/20170510104259/https://www.engadget.com/2011/03/04/ios-4-3-brings-a-handful-of-new-features-and-new-headaches/ |url-status=live }}{{cite web |date=September 16, 2013 |title=iOS: A visual history |url=https://www.theverge.com/2011/12/13/2612736/ios-history-iphone-ipad |access-date=July 15, 2017 |website=The Verge |publisher=Vox Media |archive-date=April 12, 2017 |archive-url=https://web.archive.org/web/20170412015548/http://www.theverge.com/2011/12/13/2612736/ios-history-iphone-ipad |url-status=live }}
  • Fixes multiple vulnerabilities in FreeType
  • Fixes multiple bugs that caused viewing maliciously crafted .tiff images to lead to arbitrary code execution
  • Fixes many, many bugs in WebKit that caused viewing a maliciously crafted website to lead to arbitrary code execution
  • Fixes a bug that allowed an attacker connected to the same network as an iPhone to be able to trigger a remote reset

|Initial Release, Feature Update

style="text-align: center;" |4.3.1

|8G4

|March 25, 2011

|

  • Fixes iPod touch screen glitches
  • Fixes bugs that prevented activation and connection of iPhones{{cite web |last=Cheng |first=Jacqui |date=March 25, 2011 |title=iOS 4.3.1 fixes iPod Touch graphics glitch, TV flickering issue |url=https://arstechnica.com/apple/2011/03/ios-431-fixes-ipod-touch-graphics-glitch-tv-flickering-issue/ |access-date=July 15, 2017 |website=Ars Technica |publisher=Condé Nast |archive-date=May 11, 2017 |archive-url=https://web.archive.org/web/20170511075338/https://arstechnica.com/apple/2011/03/ios-431-fixes-ipod-touch-graphics-glitch-tv-flickering-issue/ |url-status=live }}
  • Fixes image flicker when using Apple Digital AV Adapter
  • Updates SSL certificates after fraudulent certificates were issued by a Comodo affiliate registration authority
  • Fixes multiple bugs that caused viewing of a maliciously crafted website to lead to arbitrary code execution{{cite web |last=Friedman |first=Lex |date=April 14, 2011 |title=Apple releases iOS 4.3.2, fixes FaceTime, 3G issues |url=http://www.macworld.com/article/1159239/ios432.html |access-date=July 15, 2017 |website=Macworld |publisher=International Data Group |archive-date=May 10, 2017 |archive-url=https://web.archive.org/web/20170510170134/http://www.macworld.com/article/1159239/ios432.html |url-status=live }}

|Bug Fixes

style="text-align: center;" |4.3.2

|8H7
8H8{{efn|iPad 2 (CDMA) only}}

|April 14, 2011

|

  • Fixes a bug that caused FaceTime calls to freeze
  • Fixes connectivity issues on cellular-equipped iPads
  • Updates SSL certificates after fraudulent certificates were issued by a Comodo affiliate registration authority
  • Fixes multiple bugs that caused viewing of a maliciously crafted website to lead to arbitrary code execution{{cite web |last=Moren |first=Dan |date=May 4, 2011 |title=Apple releases iOS 4.3.3 to patch location bugs |url=http://www.macworld.com/article/1159643/ios433_location_fixes.html |access-date=July 15, 2017 |website=Macworld |publisher=International Data Group |archive-date=June 19, 2017 |archive-url=https://web.archive.org/web/20170619040516/http://www.macworld.com/article/1159643/ios433_location_fixes.html |url-status=live }}

|Bug Fixes

style="text-align: center;" |4.3.3

|8J2

|May 4, 2011

|

  • Fixes a bug that caused location to be reported incorrectly{{cite web |last=White |first=Charlie |date=July 15, 2011 |title=Apple iOS 4.3.4 Update Available, Prevents Hacking & Jailbreaking |url=http://mashable.com/2011/07/15/ios-4-3-4-update/ |access-date=July 15, 2017 |website=Mashable |archive-date=March 12, 2017 |archive-url=https://web.archive.org/web/20170312174403/http://mashable.com/2011/07/15/ios-4-3-4-update/ |url-status=live }}

|Bug Fixes

style="text-align: center;" |4.3.4

|8K2

|July 15, 2011

|

  • Fixes bugs that caused viewing a maliciously crafted PDF to cause arbitrary code execution
  • Fixes a bug that caused code running as user to gain system privileges{{cite web |last=Friedman |first=Lex |date=July 25, 2011 |title=Apple releases iOS 4.3.5 to fix certificate validation |url=http://www.macworld.com/article/1161328/ios435.html |access-date=July 15, 2017 |website=Macworld |publisher=International Data Group |archive-date=May 10, 2017 |archive-url=https://web.archive.org/web/20170510170138/http://www.macworld.com/article/1161328/ios435.html |url-status=live }}

It also patches the latest version of JailbreakMe (JailbreakMe 3.0).

|Bug Fixes

style="text-align: center;" |4.3.5

|8L1

|July 25, 2011

|

  • Fixes a bug that allowed an attacker in a privileged network position to capture and/or modify data in SSL/TLS-protected network sessions

|Bug Fixes

colspan="6" |iPhone 4 (CDMA) only
style="text-align: center;" |4.2.5

|8E128

|Unknown

|January 11, 2011

|Preview release on iPhone 4 (CDMA). Only available to reviewers, never shipped on release devices

  • Adds personal Wi-Fi hotspot support{{cite web |date=January 11, 2011 |title=Apple's new CDMA iPhone has built-in Wi-Fi hotspot with iOS 4.2.5 |url=http://appleinsider.com/articles/11/01/11/apples_new_cdma_iphone_has_built_in_wi_fi_hotspot_with_ios_4_2_5 |access-date=July 15, 2017 |website=AppleInsider |archive-date=May 10, 2017 |archive-url=https://web.archive.org/web/20170510090015/http://appleinsider.com/articles/11/01/11/apples_new_cdma_iphone_has_built_in_wi_fi_hotspot_with_ios_4_2_5 |url-status=live }}

|Preview Release

style="text-align: center;" |4.2.6

|8E200

| rowspan="5" |Phoenix

|January 31, 2011

|Initial release on iPhone 4 (CDMA), as while 4.2.5 also came with the device, 4.2.6 was the first public version.

  • Bug fixes for personal hotspots

|Initial Release

style="text-align: center;" |4.2.7

|8E303

|April 14, 2011

|

  • Fixes a bug that caused FaceTime calls to freeze
  • Updates SSL certificates after fraudulent certificates were issued by a Comodo affiliate registration authority
  • Fixes multiple bugs that caused viewing of a maliciously crafted website to lead to arbitrary code execution

|Bug Fixes

style="text-align: center;" |4.2.8

|8E401

|May 4, 2011

|

  • Fixes a bug that caused location to be reported incorrectly

|Bug Fixes

style="text-align: center;" |4.2.9

|8E501

|July 15, 2011

|

  • Fixes bugs that caused viewing a maliciously crafted PDF to cause arbitrary code execution
  • Fixes a bug that caused code running as user to gain system privileges

It also patches the latest version of JailbreakMe (JailbreakMe 3.0).

|Bug Fixes

style="text-align: center;" |4.2.10

|8E600

|July 25, 2011

|

  • Fixes a bug that allowed an attacker in a privileged network position to capture and/or modify data in SSL/TLS-protected network sessions

|Bug Fixes

{{notelist}}

References

{{Reflist|30em}}

External links

  • {{webarchive |url=https://web.archive.org/web/20100630155749/http://www.apple.com/iphone/softwareupdate |date=June 30, 2010 |title=iOS 4 }}

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{{Succession box|title=iOS 4|years=2010|before=iPhone OS 3|after=iOS 5}}

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{{Apple software}}

{{Apple}}

*4

Category:2010 software

Category:Products introduced in 2010

Category:Mobile operating systems

Category:Tablet operating systems

Category:Proprietary operating systems