Release record
Release notes
Editorial synthesis with inline references and a source ledger when citations are available.
Source ledger
Sources are linked to the claims they support. Publication and access dates are shown when available.
Apple Support · Apple · 2023-11-06T00:00:00.000Z · iOS 10.2.1 — Released January 23, 2017
Apple Support · Apple · 2023-11-06T00:00:00.000Z · iOS 10.2.1 — security content
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
Apple’s advisory documents multiple security corrections included with the January 23 public release.
Recorded at Public
enhancement · changed
Apple documented a power-management change intended to reduce shutdowns under demanding workloads.
Recorded at Public
Milestones
Every recorded channel appearance in chronological order. Open an appearance for any available build, scope, notes, and sources.
Public release
iOS 10.2.1 reached the public release channel on January 23, 2017. The patch improved peak-workload power management to reduce unexpected iPhone shutdowns and addressed documented security issues across push notifications, call history, contacts, the kernel, archives, device unlocking, WebKit, and Wi-Fi. This article records the public appearance only and does not assign cumulative notes to an earlier beta or infer an undocumented build document.
Historical context
Pace, intervals, and duration compared with earlier releases on the same platform.
Historical avg for .2.1 releases
68 days, 6.0 milestones
Based on 1 previous iOS .2.1 releases
| Version | Year | Cycle | Milestones | Avg. Interval |
|---|---|---|---|---|
| iOS 4.2.1 | 2010 | 68d | 6 | 14d |
Scroll horizontally to compare every historical field.