TL;DR

A Google Voice number for WhatsApp technically works for personal accounts but not WhatsApp Business at scale.
For real business WhatsApp, you need a verified WhatsApp Business API number — Twilio, 360dialog, or a managed platform.
CallSphere is the managed AI option: WhatsApp + voice + chat + SMS, one AI brain, $149–$1,499/mo.
14-day free trial, no card.

This is part of our Business Phone Systems guide.

The core answer: can you use a Google Voice number for WhatsApp?

A Google Voice number for WhatsApp is one of the most-searched phone questions of 2026. The honest answer: it sometimes works for personal WhatsApp, it does not work reliably for WhatsApp Business, and it is the wrong tool for any actual business use case. I run CallSphere and we get migration calls every week from operators who tried the Google Voice + WhatsApp hack and hit a wall.

Here is the technical reality: Google Voice numbers can receive SMS verification codes from WhatsApp personal, but Google has been increasingly throttling these verifications since 2023. For WhatsApp Business, especially Business API (which you need at any scale beyond yourself), Google Voice numbers are explicitly not supported.

What is an app like Google Voice that actually works for WhatsApp?

For an app like Google Voice that is WhatsApp-compatible:

TextNow — sometimes works for WhatsApp personal verification.
OpenPhone — paid, more reliable verification.
Twilio — paid, business-grade, supports WhatsApp Business API directly.
Telnyx — same category as Twilio.
CallSphere — managed AI platform with WhatsApp Business already integrated.

If your goal is "free WhatsApp number for personal use," none of the business options are right — just use your real cell number. If your goal is "WhatsApp for my business," Google Voice is a dead end. Skip to Twilio or CallSphere.

Are there sites like Google Voice that work better for business?

The sites like Google Voice category in 2026 splits into two:

Free/cheap consumer: TextNow, TextFree, Google Voice itself.
Business-grade: OpenPhone, Grasshopper, Dialpad, RingCentral, CallSphere.

For business, you want the second category. Free numbers come with verification issues, deliverability issues, and no SLA. The $20–$30/seat/mo bottom of the business tier is real value compared to the support tickets you will rack up with free.

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For AI-first business WhatsApp, CallSphere is in a different category — we provision a verified WhatsApp Business number and run an AI agent on it that answers messages 24/7 in 57+ languages.

What are Google Voice phones and how do they compare?

Google Voice phones is the SEO term for hardware or softphones that work with Google Voice. The supported list is narrow — Obihai adapters (now Polycom), select Cisco SPA models, and the Google Voice mobile/web app. Outside that list, you are doing call forwarding to a regular phone, not native Google Voice.

For business, this is another reason to avoid Google Voice: hardware compatibility is limited and shrinking. A Twilio or CallSphere number works with any SIP softphone, any modern desk phone, and is provisioned in minutes. Google Voice is a 2010 product that has not received serious feature investment in years.

How CallSphere does this in production

If you came here looking for a WhatsApp solution for your business — that is what we ship. The stack:

WhatsApp Business API number provisioned via Twilio, verified for business.
AI agent answers messages in 57+ languages, 24/7, ~620ms response time.
6 verticals — healthcare, real estate, sales, salon, after-hours, hotel concierge.
14 function tools — booking, CRM upsert, payment links, escalations, calendar reads.
Same agent on voice + chat + SMS + WhatsApp with shared customer state via 20+ Postgres tables.
Compliance — WhatsApp Business policy, A2P 10DLC for SMS, TCPA for voice.

You message your business on WhatsApp, the agent answers. The customer record updates everywhere. No double entry.

A real example walk-through

A boutique hotel in Mexico City wanted to handle reservation messages on WhatsApp in English and Spanish. They tried Google Voice (US number) → WhatsApp Business: verification failed twice. They tried OpenPhone: worked, but no AI, so messages piled up overnight. They moved to CallSphere hotel concierge agent in March 2026:

Verified Mexican WhatsApp Business number provisioned in 48 hours.
312 inbound WhatsApp messages/mo, 96% answered in under 60 seconds.
47% of inquiries converted to bookings (was 22% via human chat).
Same agent also took voice calls and SMS — single shared customer record.
All-in cost: $499 Growth tier + $0.005/msg Twilio.

The Google Voice path was a dead end. The right answer was a managed AI WhatsApp Business platform.

Pricing & how to try it

CallSphere includes WhatsApp Business in all tiers:

Still reading? Stop comparing — try CallSphere live.

CallSphere ships complete AI voice agents per industry — 14 tools for healthcare, 10 agents for real estate, 4 specialists for salons. See how it actually handles a call before you book a demo.

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Starter — $149/mo: 2,000 interactions across channels, 3 agents.
Growth — $499/mo: 10,000 interactions, all 6 verticals.
Scale — $1,499/mo: 50,000 interactions, HIPAA BAA.
WhatsApp message fees pass through at Twilio rates (~$0.005/msg).
14-day free trial, no card.

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Frequently asked questions

Can I really not use a Google Voice number for WhatsApp Business? You can sometimes register personal WhatsApp with a Google Voice number, but it is unreliable and against WhatsApp's terms in many cases. For WhatsApp Business (the actual business app) and especially Business API, Google Voice is not supported. Use a real Twilio or carrier number.

What is the best app like Google Voice for business in 2026? For phone-only: OpenPhone or Twilio. For phone + WhatsApp + chat + AI: CallSphere. The right pick depends on whether you want a number or a customer communication platform.

Are Google Voice phones still worth buying in 2026? No. Compatibility has narrowed and Google has not seriously invested in the product for years. Buy a modern SIP-compatible phone (Yealink, Polycom) and use Twilio or a managed platform.

What sites like Google Voice are free in 2026? TextNow and TextFree are the main free alternatives. Both have ads, verification limits, and no SLA. Fine for casual personal use; not suitable for business.

How do I get a verified WhatsApp Business number? You need a real phone number (Twilio, Telnyx, or a carrier-issued number) and you have to complete WhatsApp Business API verification. The fastest path: CallSphere provisions and verifies for you in 24–48 hours.

Can I move my Google Voice number to WhatsApp Business later? Generally no. Google Voice does not support porting in a way WhatsApp accepts. Pick a real business number from the start.

Does CallSphere replace WhatsApp Business or work with it? Works with it. We provision a WhatsApp Business API number through Twilio and connect our AI agent to it. You see all conversations in our admin dashboard plus the WhatsApp Business app if you want.

What is the cheapest way to get WhatsApp Business with AI? CallSphere Starter at $149/mo + Twilio per-message fees. That gets you a verified WhatsApp Business number, an AI agent answering in 57+ languages, and 2,000 interactions/mo. See the demo →