Business Phone Systems · 2026 reliability ranking

Most Reliable Business Phone Systems (2026)

We ranked 16 business phone systems by real-world reliability over the last 90 days, using 73 status page incidents and our own around-the-clock uptime checks. A cloud phone system carries a small business's inbound calls, voicemail, text messages and call routing, so when it goes down customers hear dead air or fail to connect and the calls usually go to a competitor. Outages also break call queues, auto-attendants and click-to-call integrations with the CRM, and staff often cannot fall back to a personal mobile without losing the business number. Because a missed sales or service call is hard to recover, a provider's outage history is worth checking before you port your numbers to it.

Last updated Nov 1, 2026 · How we score

Most reliable business phone system: Grasshopper (score 94.6/100). Highest uptime: Grasshopper (99.96%). Fewest incidents: net2phone (1 in 90 days). Fastest to resolve: Quo (formerly OpenPhone) (avg 1h 12m).

#	Vendor	Score	Uptime (90d)	Incidents	Avg resolve	Transparency	Status now
1	GrasshopperGrasshopper is a virtual phone system for small businesses and solopreneurs, owned by GoTo.	94.6	99.96%	1 (1 major)	1h 31m	100/100	Operational
2	JustCallJustCall is a cloud phone and SMS platform for sales and support teams, with CRM integrations and a sales dialer.	93.4	99.96%	4	1h 18m	100/100	Operational
3	CloudTalkCloudTalk is a Bratislava, Slovakia-based cloud calling and call center software for sales and support teams.	89.6	99.91%	2 (1 major)	3h 33m	100/100	Operational
4	GoTo ConnectGoTo Connect is the cloud phone system from GoTo (formerly LogMeIn), based in Boston, Massachusetts.	87.9	99.87%	3 (3 major)	1h 46m	100/100	Operational
5	Quo (formerly OpenPhone)Quo, formerly OpenPhone, is a cloud business phone app for small teams offering shared numbers, calling and texting.	83.4	99.83%	9 (4 major)	1h 12m	100/100	Operational
6	net2phonenet2phone is a cloud business phone and unified communications provider owned by IDT Corporation of Newark, New Jersey.	81.1	99.89%	1	14h 35m	100/100	Operational
7	Freshdesk Contact Center (Freshcaller)Freshdesk Contact Center, formerly Freshcaller, is the cloud phone and call center product from Freshworks Inc.	79.9	99.75%	5 (2 major)	3h 48m	100/100	Operational
8	DialpadDialpad is a San Ramon, California-based cloud communications company offering business phone, contact center and meetings software.	75.6	99.65%	7 (2 major)	2h 59m	100/100	Operational
9	Vonage Business CommunicationsVonage Business Communications is the cloud phone system from Vonage, a communications company owned by Ericsson.	73.0	99.72%	3	13h 24m	100/100	Operational
10	NextivaNextiva is a Scottsdale, Arizona-based provider of cloud business phone, contact center and customer communications software.	66.1	99.37%	8 (6 major)	2h 35m	100/100	Operational
11	AircallAircall is a Paris-headquartered cloud phone system for sales and support teams that integrates with CRM and help desk tools.	59.6	99.30%	17 (6 major)	4h 25m	100/100	Operational
12	Zoom PhoneZoom Phone is the cloud business phone service from Zoom Communications, the San Jose, California-based video communications company.	51.7	99.21%	13	1d 1h	100/100	Operational

Business Phone Systems reliability at a glance

Across the 12 ranked business phone systems, average 90-day uptime is 99.70%. Reliability scores range from 94.6 (Grasshopper) to 51.7 (Zoom Phone).
Together they published 73 incidents in the last 90 days, 25 of them partial or major outages.
The typical vendor takes 3h 16m to resolve an incident. Quo (formerly OpenPhone) is fastest, at 1h 12m on average.
Aircall reported the most incidents (17 in 90 days).

What to check before you choose a business phone system

Inbound calling and call routing matter most. Check incidents affecting voice separately from messaging and apps.
Set up automatic forwarding to mobile numbers so calls still reach you if the service goes down.
Outages are often regional. Check the vendor's incidents for the data centers that serve you.
If you rely on it for emergency calling, ask how 911/112 calls are handled during an outage.

90-day uptime history

Each bar is one day. Hover a bar for that day's uptime and incidents.

1. Grasshopper

99.96% uptime · 1 incidents · avg resolve 1h 31m

90 days ago99.964% average daily uptimeToday

2. JustCall

99.96% uptime · 4 incidents · avg resolve 1h 18m

90 days ago99.963% average daily uptimeToday

3. CloudTalk

99.91% uptime · 2 incidents · avg resolve 3h 33m

90 days ago99.917% average daily uptimeToday

4. GoTo Connect

99.87% uptime · 3 incidents · avg resolve 1h 46m

90 days ago99.877% average daily uptimeToday

5. Quo (formerly OpenPhone)

99.83% uptime · 9 incidents · avg resolve 1h 12m

90 days ago99.829% average daily uptimeToday

6. net2phone

99.89% uptime · 1 incidents · avg resolve 14h 35m

90 days ago99.898% average daily uptimeToday

7. Freshdesk Contact Center (Freshcaller)

99.75% uptime · 5 incidents · avg resolve 3h 48m

90 days ago99.758% average daily uptimeToday

8. Dialpad

99.65% uptime · 7 incidents · avg resolve 2h 59m

90 days ago99.656% average daily uptimeToday

9. Vonage Business Communications

99.72% uptime · 3 incidents · avg resolve 13h 24m

90 days ago99.720% average daily uptimeToday

10. Nextiva

99.37% uptime · 8 incidents · avg resolve 2h 35m

90 days ago99.377% average daily uptimeToday

11. Aircall

99.30% uptime · 17 incidents · avg resolve 4h 25m

90 days ago99.305% average daily uptimeToday

12. Zoom Phone

99.21% uptime · 13 incidents · avg resolve 1d 1h

90 days ago99.218% average daily uptimeToday

No incidents
Degraded
Partial outage
Major outage
No data

Being tracked (not ranked yet)

These vendors join the ranking once we have enough evidence: at least 14 days of data, and for vendors with a quiet status page (silent for a year, or for 90 days while their competitors report several incidents), 30 days of our own independent monitoring.

Google Voice · quiet status page, awaiting our own monitoring
8x8
RingCentral
Ooma Office · no public status page

Recent Business Phone Systems incidents

Partial outageAircallOct 29, 2026 · resolved in 2h 32m
Increased Platform Errors
Affected: Inbound Calls, Conversation Center, Aircall Workspace (Web), Outbound Calls, Aircall Workspace (Desktop), Analytics +5 more
Major outageNextivaOct 28, 2026 · resolved in 1h 4m
NextivaONE and NextOS Platform Login Issues
Affected: Nextiva Call Center, NextivaONE, NextOS Platform
Degraded performanceNextivaOct 27, 2026 · resolved in 45m
Intermittent Audio Quality and Calling Issues.
Affected: Nextiva Call Center, NextOS Platform
Degraded performanceJustCallOct 27, 2026 · resolved in 40m
Failures in incoming and outgoing calls
Affected: JustCall Dashboard, JustCall Live Dashboard
Degraded performanceVonage Business CommunicationsOct 23, 2026 · resolved in 21h 12m
Inbound Call Completion Issues — Select Canadian Regions
Affected: Inbound Call Completion
Degraded performanceFreshdesk Contact Center (Freshcaller)Oct 23, 2026 · resolved in 3h 23m
Performance degradation in Freshcaller
Partial outageGoTo ConnectOct 22, 2026 · resolved in 54m
GoTo Connect - Inbound calls failing for customers in Brazil
Affected: PSTN Calls - Inbound
Degraded performanceJustCallOct 22, 2026 · resolved in 39m
Slowness across platform
Affected: Outbound Calling, SMS Service, JustCall Dashboard, Contact sync with CRMs, help desks and other integrations, Inbound Calling, MMS Service +1 more

Head-to-head comparisons

All Business Phone Systems comparisons →

Related rankings

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Frequently asked questions

What is the most reliable business phone system?

Based on the last 90 days of data, Grasshopper is the most reliable business phone system we track, with a reliability score of 94.6/100 and 99.96% uptime.

How do you measure business phone system reliability?

We poll each vendor's public status page every few minutes, record every incident, and run our own uptime checks against each vendor's login and customer-facing pages. Uptime (40%), incident frequency (20%), average time to resolve (20%) and transparency (20%) combine into one score out of 100.

How often are these rankings updated?

Continuously. Status pages and uptime checks run every five minutes and scores are recalculated several times an hour.

Can vendors pay to rank higher?

No. Sponsored placements are clearly labelled, shown separately from the rankings and never change a vendor's score.