Release appearance

iOS 12.3.1 Public

Source-linked record
Public release

Recorded context

About this appearance

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

Date
May 24, 2019
Availability
available
Revision
No

Chronology evidence

Appearance sources

These sources support the recorded date, channel, or availability. A researched release-notes article has not been added.

  1. About iOS 12 Updates

    Apple Support · 2026-07-29 · iOS 12.3.1 — Filter Unknown Senders

  2. Apple Security Updates (2018 to 2019)

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

  3. About iOS 12 Updates

    Apple Support · 2026-07-29 · iOS 12.3.1 — Report Junk

  4. About iOS 12 Updates

    Apple Support · 2026-07-29 · iOS 12.3.1 — VoLTE calls

  5. About iOS 12 Updates

    Apple Support · 2026-07-29 · iOS 12.3.1

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.

  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.

  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.

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