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Release record

iOS 12.3.1

Full article
Public release
Recorded milestones
1
Beta cycle
—
Average interval
—
Public release
May 24, 2019

Release notes

Overview

Editorial synthesis with inline references and a source ledger when citations are available.

iOS 12.3.1 was a focused maintenance release for VoLTE calling and two Messages behaviors involving filtered unknown senders and the Report Junk link.[1]

Apple’s security index explicitly lists the release as having no published CVE entries, so the record stays limited to the three consumer-facing fixes Apple identified.[2]

Source ledger

References

Sources are linked to the claims they support. Publication and access dates are shown when available.

  1. About iOS 12 Updates

    Apple Support · 2026-07-29 · iOS 12.3.1

    Back to text ↑
  2. Apple Security Updates (2018 to 2019)

    Apple Support · Apple · 2023-11-06T00:00:00.000Z · iOS 12.3.1 — no published CVE entries; released May 24, 2019

    Back to text ↑
  3. Apple Security Updates (2018 to 2019)

    Apple Support · Apple · 2023-11-06T00:00:00.000Z · iOS 12.3.1 — released May 24, 2019

Documented & observed

Changes in this version

Source-linked features, fixes, known issues, removals, and community-observed behavior recorded across this version’s appearances and verified builds.

Release changes

Changed in this release

Features, fixes, removals, and regressions first observed in this release record.

bugFix · fixed

Messages Report Junk link fix

documentedconfirmed

Apple restored the Report Junk link when viewing a Messages thread from an unknown sender.

Recorded at Public

  1. [1] About iOS 12 Updates · iOS 12.3.1 — Report Junk

bugFix · fixed

Unknown sender filtering fix

documentedconfirmed

The update addressed a Messages issue that could allow unknown-sender messages into the main conversation list despite filtering being enabled.

Recorded at Public

  1. [1] About iOS 12 Updates · iOS 12.3.1 — Filter Unknown Senders

bugFix · fixed

VoLTE call reliability fix

documentedconfirmed

Apple corrected a condition that could prevent VoLTE calls from being made or received.

Recorded at Public

  1. [1] About iOS 12 Updates · iOS 12.3.1 — VoLTE calls

Milestones

Release history

Every recorded channel appearance in chronological order. Open an appearance for any available build, scope, notes, and sources.

  1. Public release

    Public

    Source-linked recordEditorially verified

    The public iOS 12.3.1 release was a narrow maintenance update for VoLTE calls and two Messages filtering and reporting behaviors.

    Availability
    available
    Sources
    5 linked
    Open this appearance

Historical context

Cycle comparison

Pace, intervals, and duration compared with earlier releases on the same platform.

Official release notes