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{{Use American English|date=October 2021}}
{{Use mdy dates|date=July 2020}}
{{Update|date=December 2024|reason=coverage is missing on issues related to versions before [[iOS 4]], [[iOS 15]], [[iOS 18]], and [[iOS
{{More citations needed|date=January 2024}}
The [[iOS]] mobile operating system developed by [[Apple Inc.|Apple]] has had a wide range of [[Software bug|bugs]] and security issues discovered throughout its lifespan, including security exploits discovered in most versions of the operating system related to the practice of [[iOS jailbreaking|jailbreaking]] (to remove Apple's software restrictions), bypassing the user's [[lock screen]] (known as lock screen bypasses), issues relating to battery drain, crash bugs encountered when sending photos or certain [[Unicode]] characters via text messages sent through the [[Messages (Apple)|Messages]] application, and general bugs and security issues later fixed in newer versions of the operating system.<!-- The lead needs expansion. You can help by adding to it. -->
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=== Alarm clock bugs ===
Users reported bugs in the Alarm functionality of the Clock app in all versions of iOS 4. The first bug noticed was the "DST bug" which was first seen when some countries switched to/from daylight saving time from/to standard time in October or November 2010.<ref name="SMH iOS 4 alarm bug">{{cite web |url=https://www.smh.com.au/digital-life/iphone/apple-to-fix-dst-alarm-bug-20101007-168um.html |title=Apple to fix DST alarm bug |date=October 7, 2010 |website=The Sydney Morning Herald |access-date=September 19, 2012 |archive-date=April 6, 2011 |archive-url=https://web.archive.org/web/20110406070138/http://www.smh.com.au/digital-life/iphone/apple-to-fix-dst-alarm-bug-20101007-168um.html |url-status=live }}</ref><ref name="Engadget iOS 4 DST alarm fail">{{cite web|url=https://www.engadget.com/2010/11/01/iphone-dst-bug-causing-alarms-to-fail-across-europe|title=iPhone DST bug causing alarms to fail across Europe (updated)|date=November 1, 2010|website=Engadget|access-date=January 8, 2012|archive-date=November 22, 2011|archive-url=https://web.archive.org/web/20111122182730/http://www.engadget.com/2010/11/01/iphone-dst-bug-causing-alarms-to-fail-across-europe/|url-status=live}}</ref> It caused recurring alarms to
The second alarm clock bug discovered was the "New Year's Day bug" which showed up on January 1, 2011 and January 1, 2012. It caused non-recurring alarms to never work.<ref name="Engadget iOS 4 alarm bug">{{cite web|url=https://www.engadget.com/2010/12/31/psa-iphone-alarms-not-working-come-new-years-day-2011|title=PSA: iPhone alarms not working come New Year's Day 2011|date=December 31, 2010|website=Engadget|access-date=January 8, 2012|archive-date=January 8, 2012|archive-url=https://web.archive.org/web/20120108033011/http://www.engadget.com/2010/12/31/psa-iphone-alarms-not-working-come-new-years-day-2011|url-status=live}}</ref> However, two days after each New Year's Day, on January 3, 2011, the bug appeared to resolve itself. This bug was seemingly fixed in iOS 4.3.<ref name="Engadget iOS 4 alarm again">{{cite web|url=https://www.engadget.com/2012/01/01/psa-iphone-alarm-clock-not-working-again-time-to-update|title=PSA: iPhone alarm clock not working again? Time to update|date=January 1, 2012|website=Engadget|access-date=January 8, 2012|archive-date=January 8, 2012|archive-url=https://web.archive.org/web/20120108013333/http://www.engadget.com/2012/01/01/psa-iphone-alarm-clock-not-working-again-time-to-update|url-status=live}}</ref>
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=== General battery drain ===
On September 30, 2020, Apple acknowledged a battery drain issue in iOS 14 and released a supporting document that offered the users tricks to fix the poor battery performance. In this document Apple claimed that unpairing the iPhone from an Apple Watch followed by erasing all data and settings of the iPhone, and restoring from a backup could be a possible fix for the battery life.<ref>{{cite web|url=https://www.theverge.com/2020/10/2/21499243/ios-14-watchos-7-battery-drain-apple-iphone-watch-fix|title=If iOS 14 is causing battery drain, you might need to wipe your iPhone|access-date=2 October 2020|website=The Verge|date=October 2, 2020 |archive-date=October 5, 2020|archive-url=https://web.archive.org/web/20201005183545/https://www.theverge.com/2020/10/2/21499243/ios-14-watchos-7-battery-drain-apple-iphone-watch-fix|url-status=live}}</ref>
== iOS 15 ==
== iOS 16 ==
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=== Photos reappearing ===
After updating to iOS 17.5, some users reportedly experienced a bug which caused some of their deleted photos to reappear on their devices.<ref>{{Cite web |date=2024-05-15 |title=Troubling iOS 17.5 Bug Reportedly Resurfacing Old Deleted Photos |url=https://www.macrumors.com/2024/05/15/ios-17-5-bug-deleted-photos-reappear/ |access-date=2024-05-16 |website=MacRumors |language=en}}</ref><ref>{{cite web |url=https://9to5mac.com/2024/05/17/ios-17-5-deleted-photos-app-bug/ |title=iOS 17.5 is allegedly resurfacing pictures that were deleted years age |first=Chance |last=Miller |date=2024-05-17 |access-date=2024-05-18 |website=9to5Mac}}</ref> iOS 17.5.1 was released to fix this issue, which according to Apple, was 'rare' and caused by database corruption.<ref>{{cite magazine|url=https://www.forbes.com/sites/kateoflahertyuk/2024/05/21/ios-1751-emergency-fix-issued-to-all-iphoneusers/ |title=iOS 17.5.1—Emergency Fix Issued To All iPhone Users |first=Kate |last=O'Flaherty |date=2024-05-21 |access-date=2024-05-22 |magazine=[[Forbes]]}}</ref><ref>{{cite magazine|url=https://www.macworld.com/article/2338872/ios-17-5-1-update-fixes-rare-bug-that-caused-some-deleted-photos-to-return.html |title=Update to iOS 17.5.1 to make sure your embarrassing old photos don’t resurface |first=Jason |last=Cross |date=2024-05-21 |access-date=2024-05-22 |magazine=[[Macworld]]}}</ref>
== iOS 18 ==
== iOS 26 ==
== See also ==
* [[iPhone OS 3|Issues relating to iPhone OS]]
== References ==
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