A VoIP phone system replaces desk phones and SIM cards with cloud calling from the browser and mobile. We compared the leading options on features, pricing, and the channels they actually unify. The short version: most handle calls and SMS, then leave you to bolt on a CRM and a WhatsApp tool — Connectoo brings all three together. Here are the seven best, ranked, with an honest take on who each one is for.
How We Ranked These VoIP Phone Systems
We ranked each VoIP phone system on five factors: calling quality and coverage (browser + mobile), the breadth of channels it unifies (calls, WhatsApp, SMS), whether it includes a built-in CRM or depends on integrations, automation across channels, and total cost of ownership including any extra tools you would need to buy. Connectoo ranks first because it is the only option that unifies VoIP, native WhatsApp, and SMS in one CRM with cross-channel auto follow-ups. Each competitor still earns a place for a genuine strength — AI, call-center depth, international numbers, or programmability — noted in its entry below.
The 7 Best VoIP Phone Systems in 2026, Ranked
1
1. Connectoo
Best overall — calls, WhatsApp & SMS in one CRM
Connectoo is VoIP cloud calling (browser + mobile) where every call, WhatsApp chat, and SMS lands in one built-in CRM with cross-channel auto follow-ups. Unlike pure VoIP phones, you do not bolt on a separate CRM or WhatsApp tool — it is all one platform, so a missed call can trigger a WhatsApp message automatically.
Best for
Teams that want every channel in one CRM
Pricing
Free plan; paid from $20/user/month
Pros
Native WhatsApp shared inbox + SMS + VoIP in one place
Built-in CRM — no separate Salesforce or HubSpot needed
Cross-channel auto follow-ups (call → WhatsApp/SMS)
Dialpad is an AI-native cloud phone with real-time transcription, automatic call summaries, sentiment analysis, and built-in video meetings. If AI-assisted calling is central to your team, Dialpad leads.
Best for
Teams that want AI voice intelligence and video
Pricing
From $15/user/month (annual)
Pros
Best-in-class AI: live transcription, summaries, sentiment
Aircall is a cloud call-center phone known for 250+ integrations, advanced IVR, and call-center workflows. It is built for support and sales teams that live inside an existing CRM and helpdesk stack.
JustCall is a VoIP business phone with a strong outbound sales dialer, SMS, WhatsApp, mature AI features, and 100+ CRM integrations. It is a capable all-rounder for outbound sales teams that already run an external CRM.
OpenPhone is a clean, modern phone for calls, texts, and shared numbers, popular with startups and small teams. It is simple and affordable, but without a native WhatsApp inbox or a full CRM.
CallHippo offers VoIP virtual numbers across 50+ countries with an outbound power dialer, IVR, and 100+ integrations. It is strong for teams dialing internationally on top of an existing CRM.
Best for
Teams needing global virtual numbers
Pricing
From $32/user/month (Bronze, annual); numbers extra
Exotel is a programmable cloud-telephony and contact-center platform, especially strong in India, with voice and SMS APIs and large-scale IVR. It is built for engineering-led, high-volume deployments.
Best for
Enterprises needing programmable telephony at scale
Best VoIP phone systems compared: features and pricing at a glance
Capability
Connectoo
JustCall
Aircall
Dialpad
OpenPhone
VoIP cloud calling (browser + mobile)
Yes
Yes
Yes
Yes
Yes
WhatsApp shared inbox
Yes (native)
Yes
No
No
No
SMS
Yes
Yes
Yes
US/Canada
Yes
Built-in CRM (no external CRM needed)
Yes
No (integrations)
No (integrations)
No (integrations)
No (light contacts)
Unified call + WhatsApp + SMS timeline
Yes
Partial
No
No
No
Cross-channel auto follow-ups
Yes (full)
Limited
No
No
No
Free plan
Yes (free forever)
Trial only
Trial only
Trial only
Trial only
Starting price
$20/user/mo
$29/user/mo
$30/user/mo
$15/user/mo
$15/user/mo
Starting prices reflect each provider’s lowest paid tier on annual billing and may require a minimum number of seats. Connectoo Bronze is $20/user/month for US, Canada, and UK calling. Figures current as of June 2026 — check each provider for the latest pricing.
Which VoIP Phone System Is Right for Your Team?
Choose Connectoo if WhatsApp is a real channel for your customers and you want calls, chats, and texts in one CRM with auto follow-ups — no separate CRM or WhatsApp subscription. Choose Dialpad if AI transcription, summaries, and built-in video are central. Choose Aircall if you run a call center deep inside an existing CRM and helpdesk stack. Choose JustCall for high-volume outbound sales dialing with SMS. Choose OpenPhone for a simple, affordable startup phone. Choose CallHippo if you need virtual numbers across many countries, and Exotel if you need programmable telephony APIs at enterprise scale.
Why Unified Channels Beat a Phone Plus Add-Ons
Most VoIP phone systems are excellent at calling but stop at calls and SMS. To cover WhatsApp and keep a system of record, you end up buying a separate CRM and a separate WhatsApp tool, then wiring them together with integrations. Every handoff is a place data goes missing and follow-ups slip. Connectoo’s approach is to put VoIP calls, a native WhatsApp inbox, and SMS on one timeline in a built-in CRM, so a missed call can fire a WhatsApp message automatically and every conversation stays in one place. That is why it tops this list for teams that talk to customers across more than one channel.
Frequently Asked Questions
Looking for Alternatives to a Specific Tool?
If you are evaluating a particular VoIP provider, these guides cover the best alternatives to each — with Connectoo’s unified-channel angle and honest takes on every option.
