VoIP caller apps cover very different jobs. WhatsApp provides free app-to-app voice and video calling, Google Voice and TextNow can provide phone numbers for eligible users, while Zoom Phone and Microsoft Teams Phone are paid cloud-phone systems built for organizations.
Choose by call destination first. If you only need to call other users of the same app, a free app can be enough. If you need a business number that can call and receive PSTN calls, compare a cloud-phone service, calling plan, number availability, SMS, admin controls, emergency calling, and regional support.
VoIP Caller Apps: Free and Paid Options by Use Case
| Use case | Option | What to verify |
|---|---|---|
| Free app-to-app calls | Calls are free apart from data charges, end-to-end encrypted, and work across supported phones, computers, tablets, and web; both parties need WhatsApp. | |
| Free U.S. number for an individual | Google Voice Basic | Google currently lists a $0 individual plan in the U.S. with one number and domestic calling/texting; availability and account requirements matter. |
| Ad-supported North American number | TextNow | Free app service includes a number and North American calling/texting; geographic availability and SIM/wireless features differ. |
| Business phone inside Zoom | Zoom Phone | Cloud PBX, phone numbers/calling plans, SMS/MMS in supported plans, recording, integrations, and multi-device calling. |
| Business phone inside Microsoft Teams | Microsoft Teams Phone | Teams Phone Standard is currently listed at $10/user/month annually; PSTN service is added through Microsoft Calling Plans, Operator Connect, or Direct Routing. |
Free VoIP Does Not Always Mean a Free Phone Number
WhatsApp voice and video calls are free to other WhatsApp users and are end-to-end encrypted, but that is different from having a normal business telephone number that any customer can dial. WhatsApp says its calls have no time limits and support one-to-one or group calling, with data charges still possible.
Google Voice and TextNow solve a different problem because they can provide telephone numbers in eligible markets. Google currently lists a $0 Voice plan for individuals in the U.S., while TextNow’s free app service is ad-supported and provides a North American number, calling, and texting over Wi-Fi or another data connection.
Google Voice: Simple Number-Based Calling
Google Voice is a practical starting point when you want a separate U.S. number without building a full contact-center system. Google’s current individual Basic plan is $0 per month and includes one number across devices plus unlimited domestic calling and texting, subject to its published terms.
For teams, Google Voice has paid Workspace-oriented plans with features such as support, call transfers, desk-phone/ATA support, auto attendants on higher tiers, and administration. Check the current plan because individual and team products are not the same service level.
TextNow: Free Calling and Texting With Geographic Limits
TextNow currently says its free app works on Android, iOS, or desktop and includes a free number with unlimited calling and texting across North America. The free app relies on Wi-Fi or an existing data connection unless the user also uses TextNow’s SIM/wireless service.
TextNow’s geographic policy has changed in 2026, so do not treat it as a globally available free phone service. Its current support documentation says account registration and app availability are limited to North America, with wireless coverage rules varying by country and plan.
Zoom Phone: Paid Cloud PBX for Organizations
Zoom Phone is designed around business telephony rather than free consumer calling. Zoom currently lists domestic calling, phone numbers, call recording, multi-device calling, integrations, SMS/MMS in supported markets, online fax, and AI features such as post-call summaries on current bundles.
It makes the most sense to compare when a team already uses Zoom Workplace or wants meetings, chat, and phone under one administration layer. Pricing depends on bundle, billing term, region, and calling plan, so use Zoom’s current pricing page rather than a static “best app” article for a purchase decision.
Microsoft Teams Phone: Add PSTN Calling to Teams
Teams Phone is a cloud phone system native to Microsoft Teams. Microsoft currently lists Teams Phone Standard at $10 per user per month when paid yearly, with a separate Teams license required. PSTN connectivity can come from Microsoft Calling Plans, Operator Connect, Direct Routing, or participating mobile operators.
This is a better fit for an organization already standardized on Microsoft 365 and Teams than for a casual user who only wants free internet calls.
What About RingCentral?
RingCentral remains a major business communications option, but it belongs in the same paid cloud-phone category as Zoom Phone and Teams Phone rather than in a ranking against WhatsApp. Its current RingEX product combines business numbers, calling, messaging, administration, integrations, and optional contact-center or AI add-ons.
Because RingCentral pricing and packaging vary by tier and have changed over time, verify the current RingEX plans rather than relying on an old per-user price quoted in a blog post.
How to Choose a VoIP Caller App
- Decide who you need to call. App users only, or normal mobile and landline numbers?
- Decide whether you need a phone number. A free chat app and a business PSTN line are different products.
- Check region support. Number availability, SMS, emergency calling, and calling plans vary by country.
- Check administration. Teams may need extensions, auto attendants, queues, recording, analytics, and role-based controls.
- Check hardware. Confirm support for computer headsets, desk phones, mobile devices, USB adapters, or SIP endpoints.
- Test your network. Wi-Fi quality, latency, jitter, packet loss, and VPN routing can affect voice quality regardless of the app.
Free vs. Paid: The Practical Difference
Free services are useful when both parties can use the same app or when a lightweight personal number is enough. Paid business systems add administration, PSTN connectivity, company numbers, routing, compliance options, support, and integration depth.
The cheapest app is not automatically the lowest-cost business solution. Account for support time, number porting, devices, calling rates, SMS, integrations, recording, emergency calling, and the operational cost of switching systems later.
Need a Headset for VoIP Calls?
After choosing the calling app, match the headset to the device and connection path: USB-A, USB-C, 3.5 mm, or Bluetooth, plus microphone and mute-control requirements.
Frequently Asked Questions
What is the best free VoIP caller app?
It depends on the job. WhatsApp is useful for free app-to-app calling, Google Voice offers a free U.S. individual number, and TextNow offers an ad-supported North American number and calling service.
Can a free VoIP app call normal phone numbers?
Some can, but not all. WhatsApp calls other WhatsApp users, while Google Voice and TextNow can provide telephone-number calling in supported markets. Verify destination and rate rules.
What is the difference between Zoom Phone and normal Zoom calls?
Zoom Phone is a cloud PBX with telephone numbers and PSTN calling plans. Regular Zoom meetings and app calls are collaboration sessions rather than a replacement for every business-phone function.
Do VoIP apps work with any headset?
Not automatically. Check the computer or phone connection, operating system, app audio settings, microphone path, call controls, and any USB adapter or Bluetooth requirements.
1 comment
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