← Lighthouse Briefings · Issue shooting · Not-ring spike · 2026-05-22

● ACTIVE INVESTIGATION NR · not ring iOS + Android 2026-05-22 onset 12 countries all versions REAL DATA

Not-Ring rate spike — Cross-platform — 2026-05-22

iOS +2.31pp · Android +0.81pp · onset May 22 · peak May 27 · Silence Never Ring is primary driver

Onset date

2026-05-22

iOS Not-Ring delta

12.00% → 14.31% (+2.31pp)

Android Not-Ring delta

21.16% → 21.97% (+0.81pp)

Peak day

2026-05-27

01 What happened

Starting 2026-05-22, the Not-Ring rate (call setup failure where the callee device never rings) began rising across both platforms. The sharpest single-day jump on iOS was 5/22 → 5/23 (+1.24pp: 12.79% → 14.03%). Both platforms reached their window peak on 2026-05-27: iOS at 15.45%, Android at 22.83%.

The Silence Never Ring sub-type (device never rings despite push delivery) accounts for approximately 80% of the iOS period delta (+1.82pp of the total +2.31pp). The Delay Ring sub-type contributes the remaining +0.49pp.

Paired call volume dropped approximately 16% on both platforms in the same window (iOS: 105.1M → 88.1M; Android: 143.1M → 120.8M).

02 Data

Not-Ring rate · iOS + Android · daily · 2026-05-12 to 05-30 Source: Grafana · Call Setup Dashboard · ads_botim_voip_result_call_setup_1d_di

Android Not-Ring (left axis) iOS Not-Ring (right axis)

Onset: 2026-05-22 (progressive). Peak: 2026-05-27 — iOS 15.45%, Android 22.83%. iOS baseline (05/12–21 avg): ~12.00%. Android baseline: ~21.16%. Note: 05/30 volume appears incomplete.

Period-over-period summary · 05/12–21 (baseline) vs 05/22–31

Metric	Before (05/12–21)	After (05/22–31)	Delta
iOS Not-Ring	12.00%	14.31%	+2.31pp
iOS Silence Never Ring	8.94%	10.76%	+1.82pp
iOS Delay Ring	3.06%	3.55%	+0.49pp
iOS Paired Calls	105.1M	88.1M	−16.2%
Android Not-Ring	21.16%	21.97%	+0.81pp
Android Silence Never Ring	17.93%	18.36%	+0.43pp
Android Delay Ring	3.23%	3.61%	+0.38pp
Android Paired Calls	143.1M	120.8M	−15.6%

iOS — version breakdown

Version	Before NR	After NR	Δ

Android — version breakdown

Version	Before NR	After NR	Δ

All iOS versions (v4.5–v4.10) degraded by ~2pp — platform-wide pattern, not version-specific. Android degradation is smaller (~0.7–1.4pp) and more uniform.

iOS — country breakdown · Not-Ring delta

Country	Before NR	After NR	Δ

Android — country breakdown · Not-Ring delta

Country	Before NR	After NR	Δ

iOS: Gulf (AE +2.89pp, QA +2.53pp, KW +1.32pp) and BD (+2.68pp) show the largest deltas. Android: BD (+2.86pp) and QA (+1.79pp) lead.

03 Observed scope

Platforms: iOS and Android — both degraded; iOS more severely (+2.31pp vs +0.81pp).
Onset: 2026-05-22 (progressive step-up); sharpest single-day jump on iOS on 5/23 (+1.24pp).
Peak: 2026-05-27 — iOS 15.45% Not-Ring, Android 22.83% Not-Ring.
Sub-type: Silence Never Ring is the dominant component on iOS (~80% of the period delta). Delay Ring contributes the remainder.
Versions: all measured iOS versions (v4.5–v4.10) and Android versions (v4.0–v4.10) degraded by a similar magnitude — no single version stands out.
Countries — iOS largest delta: AE +2.89pp, BD +2.68pp, QA +2.53pp, SG +2.45pp, FR +2.23pp.
Countries — Android largest delta: BD +2.86pp, QA +1.79pp, US +1.36pp.
Paired call volume dropped ~16% on both platforms in the same window.
Status as of 2026-05-30: elevated but below peak. 05/30 volume appears incomplete (possible data lag).

04 Investigation

Status

Active · investigation owned by VoIP Quality

Tracking

ProductBoard subfeature

Analysis

Root cause, hypotheses, and follow-ups are tracked in PB — not in this briefing.