Best WiFi Calling Apps for Smartphones

What are WiFi Calling Apps?

WiFi calling apps let your smartphone place and receive voice calls and messages over an internet connection instead of using carrier voice minutes. Some apps route calls only between app users (app-to-app), like WhatsApp or Signal. Others let you call real phone numbers — landlines and mobiles — by routing the call over the internet to the public phone network (app-to-phone). That second type is often called VoIP (voice over IP).

Why choose an app for Wi Fi calling?

• Use when cellular signal is weak but you have WiFi or mobile data.
• Save on international minutes by paying app rates instead of your carrier’s international fees.
• Text, call, and share media without using standard SMS/MMS (useful for international contacts).

Common differences to watch for:

• Free app-to-app calls vs paid app-to-phone calls. Many apps offer both.
• Whether the app requires registration or a phone number.
• How the app bills: per-second, per-minute, subscription, or pay-as-you-go credits.
• Platform support: iOS, Android, desktop, or iPad-only features.

If you want a deeper comparison of options that focus on WiFi calling, see our guide on the best WiFi calling apps.

Top 10 WiFi Calling Apps

Below are ten widely used apps that make voice calls over WiFi or mobile data. I describe what each does best and when to choose it.

1. Skype

• What it does: App-to-app calling is free. Calls to real phone numbers use Skype Credit or a subscription.
• Strengths: Global reach, pay-per-minute rates for international landlines, and solid desktop integration.
• Best for: People who need to call international landlines from desktop or mobile.

2. Google Voice

• What it does: Free calls and texts in the U.S. to U.S./Canada numbers; low-cost international calling to other countries.
• Strengths: Built-in voicemail, phone number portability on Android/iOS/desktop.
• Best for: U.S.-based users who want a reliable second number and easy voicemail transcription.

3. WhatsApp

• What it does: Free app-to-app voice and video calls; end-to-end encryption.
• Strengths: Massive user base worldwide; easy group calls.
• Limitations: Cannot call regular phone numbers directly.
• Best for: Staying in touch with people who already use WhatsApp.

4. Viber (and Viber Out)

• What it does: Free app-to-app calls; Viber Out lets you call landlines and mobiles for a fee.
• Strengths: Good global coverage for paid calls, simple in-app credit system.
• Best for: Users who want both free messaging and occasional paid phone-number calls.

5. Signal

• What it does: Secure app-to-app voice and video calls; strong privacy features.
• Strengths: End-to-end encryption, low data usage.
• Limitations: No direct calling to phone numbers.
• Best for: Privacy-focused conversations with other Signal users.

6. FaceTime Audio (iOS only)

• What it does: High-quality audio calls between Apple devices over WiFi or mobile data.
• Strengths: Excellent audio quality and system-level integration on iPhone/iPad/Mac.
• Limitations: Only works between Apple devices.
• Best for: Apple-only households or teams.

7. Telegram

• What it does: Secure app-to-app voice calls and group voice chats.
• Strengths: Fast, works across platforms, large group features.
• Limitations: No calling to regular phone numbers (only app-to-app).
• Best for: Users who combine messaging and occasional voice chats with groups.

8. Rebtel

• What it does: App-to-app calls and competitive rates for calls to phone numbers; offers local access numbers and subscription plans.
• Strengths: Good for calling specific countries with low per-minute rates and local dialing options.
• Best for: Frequent international callers who want a local number approach.

9. Telvio

• What it does: Mobile VoIP app that calls real phone numbers in 200+ countries using WiFi or mobile data.
• Strengths: Rates from $0.02/min to the U.S. and $0.08/min to India; per-second billing, no connection fees, credits never expire; no registration required and no account needed; 1 free minute on first install.
• Best for: People who need cheap, pay-as-you-go calls to landlines and mobiles worldwide without creating an account.
• Notes: Choose between Starter, Standard, and Pro credit packs ($1.99, $4.99, $9.99) depending on how much you plan to call.

10. LINE

• What it does: App-to-app calls and LINE Out for calling mobile and landline numbers.
• Strengths: Popular in Asia, strong messaging features.
• Best for: Users communicating in regions where LINE is the dominant messaging app.

Pick an app based on who you call most (app users vs phone numbers), whether you need a local phone number or voicemail, and how you prefer to pay (subscription vs pay-as-you-go). If you need help choosing between VoIP options for personal vs business use, our business VoIP comparison may help frame the trade-offs.

Apps That Work Without WiFi

When a searcher types “calling app that doesn’t need wifi” they usually mean one of two things:

• An app that works over cellular data (3G/4G/5G) instead of WiFi.
• A service that offers local access numbers or callback features so you can place calls from a regular phone line without an internet connection.

Apps that work over mobile data

• Most modern WiFi calling apps also work over mobile data. WhatsApp, Skype, Viber, Telvio, Google Voice, and Signal will make or receive calls using your phone’s data connection. That means you can make calls in the subway or on the move where cellular signal is present but WiFi isn’t.

Apps that provide local-number dialing or callback

• Some services (Rebtel, certain international calling providers) offer local access numbers or callback methods. You dial a local number with normal cellular minutes and the provider bridges the call to the international number. This effectively lets you call without using data, though you may pay per-minute carrier charges for the local leg.

Native carrier WiFi calling vs apps

• Note that many carriers provide built-in “Wi-Fi Calling” that uses your regular phone number and carrier minutes. That is different from apps that route calls over the internet to other phones. If you specifically want an app to make calls over wifi or mobile data to save on international rates, pick a VoIP app that supports calling phone numbers.

If you need a short comparison of internet-based calling and traditional calling cards, our international calling cards comparison gives a quick view of costs and use cases.

How to Use WiFi Calling Apps

Here are practical steps to set up and get reliable results from an app for calling over WiFi or mobile data.

1. Choose the right app for your use case

• App-to-app calls only: WhatsApp, Signal, Telegram, FaceTime.
• App-to-phone-number calls: Skype, Viber Out, Rebtel, Telvio, LINE Out.
• Consider device support, cost, and whether you need text over WiFi as well.

2. Install and grant permissions

• Allow microphone access and, if needed, contacts and notifications.
• For apps that call phone numbers, allow access to your phonebook to match numbers.

3. Test your connection

• Make a short test call on your WiFi network. If audio drops or latency is high, switch to mobile data for the call or try a different WiFi network.
• Many apps show call quality indicators. Aim for a stable upload/download speed — 100–200 kbps is typically enough for a clear voice call.

4. Understand billing and credits

• If you’re using an app to make phone calls over WiFi (paid), check billing. Telvio, for example, offers pay-as-you-go credit packs ($1.99, $4.99, $9.99), per-second billing, and no connection fees. Credits never expire, and you get 1 free minute on first install.
• For subscription services, confirm which countries the plan covers and if it includes landlines and mobiles.

5. Place the call

• Dial from contacts or enter the international number with country code (+44 for the UK, +91 for India).
• For large international calls, double-check country and area codes to avoid misdials.

6. Manage data usage

• If you’re on a limited mobile data plan, set the app to use WiFi-only for calls or monitor consumption.
• Some apps let you reduce call quality to save data.

7. Virtual numbers and advanced features

• If you need a virtual phone number (local presence in another country), explore guides like our virtual phone numbers guide or the free virtual phone numbers guide.
• Businesses looking to move to internet calling should see our business VoIP comparison.

How to choose between per-second and per-minute billing

• Per-second billing saves money on short calls. Telvio’s per-second billing is useful if you frequently make brief check-ins. Per-minute billing might round up small calls, increasing cost.

Tip: keep a small balance in a pay-as-you-go app to avoid interruptions during important calls. If you travel, test local calling rates and consider a local WiFi SIM or roaming package.

Benefits of WiFi Calling

WiFi calling apps bring several tangible advantages for both casual users and frequent travelers.

Lower cost for international calls

• Calling internationally from a WiFi calling app often costs less than carrier international minutes. For example, Telvio lists rates from $0.02/min to the U.S. and $0.08/min to India, which can be far cheaper than most roaming rates.

Better indoor coverage

• If your building has poor cellular service, WiFi calling apps let you place clear calls via your internet connection.

Flexibility: WiFi or mobile data

• Most apps work on WiFi and mobile data, so you can switch seamlessly between networks. That makes them reliable whether you’re at home, in a café, or traveling.

No long-term commitment

• Many apps offer pay-as-you-go credits or simple monthly plans. With credit packs that don’t expire, you won’t lose money if your calling patterns change.

Advanced features

• VoIP apps often include voicemail, caller ID, call forwarding, and sometimes local virtual numbers. For detailed setup on virtual numbers, see our virtual phone numbers guide.

Business advantages

• Companies can cut costs on international calling and use app-based numbers to maintain a local presence. If you’re evaluating options, the business VoIP comparison helps weigh features and pricing.

Environmental and travel perks

• Use WiFi calling abroad to avoid roaming charges. When paired with a local WiFi network or mobile data plan, WiFi calling apps reduce the need for expensive roaming minutes.

Security and privacy

• Many modern apps offer strong encryption for voice and text. If privacy matters, choose apps like Signal or apps that publish their security model.

Drawbacks to consider

• Call quality depends on your internet connection.
• Some services don’t call regular phone numbers for free.
• Emergency calling (e.g., 911) may behave differently on VoIP apps. Check local regulations and app capabilities.

If you compare the cost of international calling apps with traditional calling cards, our international calling cards comparison shows when a VoIP app becomes the cheaper choice.