Business Phone Systems · reliability comparison
Quo (formerly OpenPhone) vs Zoom Phone: which is more reliable? (2026)
Quo (formerly OpenPhone) is more reliable than Zoom Phone, scoring 83.4 vs 51.7 out of 100. Over the last 90 days Quo (formerly OpenPhone) reported 9 incidents and Zoom Phone reported 13, with effective uptime of 99.83% and 99.21% respectively. Quo (formerly OpenPhone) resolves incidents faster on average (1h 12m).
Data updated Nov 1, 2026 · How we score
| Metric | Quo (formerly OpenPhone) | Zoom Phone |
|---|---|---|
| Reliability score | 83.4 | 51.7 |
| Rank (business phone systems) | #5 | #12 |
| Uptime (90 days) | 99.83% | 99.21% |
| Incidents (90 days) | 9 | 13 |
| Partial / major outages | 4 | 0 |
| Avg time to resolve | 1h 12m | 1d 1h |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where Quo (formerly OpenPhone) and Zoom Phone differ
- Zoom Phone reported 44% more incidents than Quo (formerly OpenPhone) over the last 90 days (13 vs 9).
- Quo (formerly OpenPhone) had 4 partial or major outages, compared with 0 for Zoom Phone.
- Quo (formerly OpenPhone) fixes problems faster: 1h 12m on average, against 1d 1h for Zoom Phone (20.8× quicker).
- Quo (formerly OpenPhone)'s longest outage on record lasted 3d (Jul 24, 2026); Zoom Phone's lasted 3d (Sep 25, 2026).
90-day uptime
Quo (formerly OpenPhone)
Zoom Phone
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent Quo (formerly OpenPhone) incidents
- Degraded performanceOct 17, 2026 · resolved in 37m
Elevated calling errors within the APAC region
Affected: Calling
- InformationalOct 15, 2026 · resolved in 10d 20h
- Degraded performanceOct 14, 2026 · resolved in 1h 11m
Affected: Text Messaging
- Major outageOct 1, 2026 · resolved in 53m
Affected: Calling
- Degraded performanceSep 27, 2026 · resolved in 2h 5m
Affected: Android App, Mac App, IOS App, Website
- InformationalSep 17, 2026 · resolved in 6d 18h
Recent Zoom Phone incidents
- MaintenanceOct 19, 2026 · resolved in 2d 12h
[Scheduled] Zoom Phone Maintenance - AMS3 Data Center: October 19, 2026
- InformationalOct 19, 2026 · resolved in 16m
Service Degradation Affecting ZP SMS Australia Mobile Numbers
Affected: SMS/MMS (Inbound/Outbound)
- MaintenanceOct 18, 2026 · resolved in 2h
[Scheduled] Zoom Phone Update - Japan SIP Zones: October 18, 2026 (No Operational Impact)
- MaintenanceOct 18, 2026 · resolved in 9h
[Scheduled] Zoom Phone Update: October 18, 2026 (No Operational Impact)
- InformationalOct 9, 2026 · resolved in 12m
Service Degradation Affecting Zoom Phone and Zoom Contact Center PCI Integration in North America
Affected: PCI Integration, PCI Integration
- MaintenanceOct 9, 2026 · resolved in 1d 6h
[Scheduled] Zoom Phone India Maintenance (Hyderabad Data Center): October 09, 2026
Other business phone systems to consider
- Grasshopper · #1 · 99.96% uptime
- JustCall · #2 · 99.96% uptime
- CloudTalk · #3 · 99.91% uptime
- GoTo Connect · #4 · 99.87% uptime