Release record
Release notes
Editorial synthesis with inline references and a source ledger when citations are available.
Apple’s archived index and advisory place iPhone OS 3.1.3 on February 2, 2010. A same-day Macworld report preserves ordinary fixes for iPhone 3GS battery-level accuracy, third-party application launch failures, and crashes involving the Japanese Kana keyboard.[1][2][3]
Apple’s primary advisory separately confirms five security items across crafted audio, TIFF images, recovery-mode USB handling, FTP directory parsing, and remote media loading in HTML mail. The ordinary changes remain attributed to contemporaneous journalism because they are absent from Apple’s retained advisory.[4][5]
Source ledger
Sources are linked to the claims they support. Publication and access dates are shown when available.
Apple Support · 2026-07-30 · iOS 3.1.3 — 02 February 2010
Apple Support · 2010-02-02T00:00:00Z · iOS 3.1.3 security content
Macworld · Dan Moren · 2010-02-02T10:53:00Z · Same-day report and ordinary fixes
Apple Support · 2010-02-02T00:00:00Z · CoreAudio through WebKit
Macworld · Dan Moren · 2010-02-02T10:53:00Z · Maintenance-note preservation
Macworld · Dan Moren · 2010-02-02T10:53:00Z · February 2, 2010 release and maintenance notes
Documented & observed
Source-linked features, fixes, known issues, removals, and community-observed behavior recorded across this version’s appearances and verified builds.
Release changes
Features, fixes, removals, and regressions first observed in this release record.
security · fixed
The fix stopped remote audio or video in an HTML email from bypassing the setting that disabled remote image loading and signaling that a message had been read.
Recorded at Public
security · fixed
Apple corrected multiple FTP parsing weaknesses that could disclose information, terminate an app, or execute code.
Recorded at Public
security · fixed
Apple repaired memory corruption that could otherwise let someone with physical access bypass a passcode and reach user data.
Recorded at Public
bugFix · fixed
The contemporaneous release report lists a correction for third-party programs that sometimes failed to launch.
Recorded at Public
bugFix · fixed
Macworld's same-day preservation of the update notes identifies more accurate battery reporting on iPhone 3GS.
Recorded at Public
security · fixed
Apple fixed a CoreAudio buffer overflow and an ImageIO buffer underflow that could terminate an app or execute code.
Recorded at Public
bugFix · fixed
The preserved maintenance notes identify a crash that could occur while using the Japanese Kana keyboard.
Recorded at Public
Milestones
Every recorded channel appearance in chronological order. Open an appearance for any available build, scope, notes, and sources.
Public release
The public iPhone OS 3.1.3 update combined three contemporaneously preserved maintenance fixes with Apple-confirmed CoreAudio, ImageIO, Recovery Mode, and WebKit security repairs.
Historical context
Pace, intervals, and duration compared with earlier releases on the same platform.
Historical avg for .1.3 releases
30 days, 3.0 milestones
Based on 2 previous iOS .1.3 releases
| Version | Year | Cycle | Milestones | Avg. Interval |
|---|---|---|---|---|
| iOS 12.1.3 | 2019 | 34d | 4 | 11d |
| iOS 6.1.3 | 2013 | 26d | 2 | 26d |
Scroll horizontally to compare every historical field.