Business Phone Systems · reliability comparison
JustCall vs Quo (formerly OpenPhone): which is more reliable? (2026)
JustCall is more reliable than Quo (formerly OpenPhone), scoring 93.4 vs 83.4 out of 100. Over the last 90 days JustCall reported 4 incidents and Quo (formerly OpenPhone) reported 9, with effective uptime of 99.96% and 99.83% respectively. Quo (formerly OpenPhone) resolves incidents faster on average (1h 12m).
Data updated Nov 2, 2026 · How we score
| Metric | JustCall | Quo (formerly OpenPhone) |
|---|---|---|
| Reliability score | 93.4 | 83.4 |
| Rank (business phone systems) | #2 | #5 |
| Uptime (90 days) | 99.96% | 99.83% |
| Incidents (90 days) | 4 | 9 |
| Partial / major outages | 0 | 4 |
| Avg time to resolve | 1h 18m | 1h 12m |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where JustCall and Quo (formerly OpenPhone) differ
- Quo (formerly OpenPhone) reported 2.3× as many incidents as JustCall over the last 90 days (9 vs 4).
- Quo (formerly OpenPhone) had 4 partial or major outages, compared with 0 for JustCall.
- JustCall's longest outage on record lasted 12m (Mar 9, 2026); Quo (formerly OpenPhone)'s lasted 3d (Jul 24, 2026).
90-day uptime
JustCall
Quo (formerly OpenPhone)
- No incidents
- Degraded
- Partial outage
- Major outage
- No data
Recent JustCall incidents
- Degraded performanceOct 27, 2026 · resolved in 40m
Failures in incoming and outgoing calls
Affected: JustCall Dashboard, JustCall Live Dashboard
- Degraded performanceOct 22, 2026 · resolved in 39m
Affected: Outbound Calling, SMS Service, JustCall Dashboard, Contact sync with CRMs, help desks and other integrations, Inbound Calling, MMS Service +1 more
- Degraded performanceSep 1, 2026 · resolved in 29m
Partial Degradation of Calling, SalesDialer, and Inbound Call Services
Affected: Inbound Calling, Sales Dialer
- Degraded performanceAug 18, 2026 · resolved in 3h 23m
Slowness reported across platform
Affected: Outbound Calling, SMS Service, JustCall Dashboard, Inbound Calling, MMS Service, Sales Dialer
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
Calling Outageofficial update ↗
Affected: Calling
- Degraded performanceSep 27, 2026 · resolved in 2h 5m
Affected: Mac App, IOS App, Website, Android App
- InformationalSep 17, 2026 · resolved in 6d 18h
Other business phone systems to consider
- Grasshopper · #1 · 99.96% uptime
- CloudTalk · #3 · 99.91% uptime
- GoTo Connect · #4 · 99.87% uptime
- net2phone · #6 · 99.89% uptime