Business Phone Systems · reliability comparison
JustCall vs Zoom Phone: which is more reliable? (2026)
JustCall is more reliable than Zoom Phone, scoring 93.4 vs 51.8 out of 100. Over the last 90 days JustCall reported 4 incidents and Zoom Phone reported 13, with effective uptime of 99.96% and 99.21% respectively. JustCall resolves incidents faster on average (1h 18m).
Data updated Nov 1, 2026 · How we score
| Metric | JustCall | Zoom Phone |
|---|---|---|
| Reliability score | 93.4 | 51.8 |
| Rank (business phone systems) | #2 | #13 |
| Uptime (90 days) | 99.96% | 99.21% |
| Incidents (90 days) | 4 | 13 |
| Partial / major outages | 0 | 0 |
| Avg time to resolve | 1h 18m | 1d 1h |
| Outages we detected | 0 | 0 |
| Transparency score | 100/100 | 100/100 |
Where JustCall and Zoom Phone differ
- Zoom Phone reported 3.3× as many incidents as JustCall over the last 90 days (13 vs 4).
- JustCall fixes problems faster: 1h 18m on average, against 1d 1h for Zoom Phone (19.3× quicker).
- JustCall's longest outage on record lasted 12m (Mar 9, 2026); Zoom Phone's lasted 3d (Sep 25, 2026).
90-day uptime
JustCall
Zoom Phone
- 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 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
- CloudTalk · #3 · 99.91% uptime
- GoTo Connect · #4 · 99.87% uptime
- Quo (formerly OpenPhone) · #5 · 99.83% uptime