Wi-Fi Calling: How to make calls over the internet without a SIM card and save on communication costs

Have you ever lost your connection in a basement, an elevator, or a country house where the mobile signal is barely there? Yet, these same places often have reliable Wi-Fi. This is where technology comes to the rescue. Wi-Fi Calling — internet calls, which are a lifesaver when cell service is unavailable. But how does it work, is it safe, and how can you set it up on your smartphone? Let's take a closer look.

Wi-Fi Calling (or VoWiFi — Voice over Wi-Fi) allows you to make calls and send SMS messages over a wireless network, rather than through traditional cell towers. The technology is integrated into modern smartphones and supported by most carriers. The main advantage is Calls are charged as usual (at the mobile operator's rate), but work even with zero GSM/4G signal strength, if there is access to Wi-Fi.

How Wi-Fi Calling Works: Technical Details

The technology is based on the protocol IMS (IP Multimedia Subsystem), which provides voice transmission over IP networks. When you make a call over Wi-Fi, your smartphone:

1. Checks for a stable Wi-Fi connection (speed from 1 Mbps).
2. Automatically switches from cellular network to VoWiFi if GSM signal is weak.
3. Establishes a secure connection with the operator's servers via EPDG (gateway for traffic encryption).
4. Routes the call like a normal one, but via the Internet.

Important: Wi-Fi Calling Doesn't Replace VoIP (For example, Skype or WhatsApp). Here you call regular phone numbers, not messaging apps. Calls are routed through the mobile operator's infrastructure, so:

• 📞 Your phone number is saved (the subscriber will see it, not your account ID).
• 💰 Calls are charged according to your mobile plan (free minutes, packages, etc.).
• 📶 Works even without a SIM card (if the operator supports it) eSIM or virtual SIM).

Advantages and Disadvantages of Wi-Fi Calling

This technology solves many problems, but it also has its limitations. Let's compare the pros and cons in the table:

One of the key advantages is save on roamingFor example, if you're on vacation abroad but connected to a hotel's Wi-Fi, calls will be charged as domestic calls (according to your plan's rules) rather than international rates. However, there's a catch:

⚠️ Please note: Some operators may block Wi-Fi Calling while roaming or apply additional charges. Check the terms in your account or contact support.

Which operators in Russia will support Wi-Fi Calling in 2026?

As of early 2026, the technology is officially supported by four major operators:

• 📡 MTS — for subscribers with the "My Online", "Ultra", "Tariff Constructor" and business lines tariffs.
• 🟢 Beeline — available on the "Everything," "Unlimited," and "My Beeline" tariffs (requires activation in your personal account).
• 🔴 Megaphone — works with the "All Inclusive", "X", and "Comfort" tariffs (check your SIM card's support).
• 🟠 Tele2 — supported by the "My Tele2", "My Conversation", "My Unlimited" tariffs (limited by regions).

To find out if Wi-Fi Calling is available on your plan:

1. Open the operator's official app.
2. Go to the "Services" or "Communication Settings" section.
3. Find the item Wi-Fi Calling or Wi-Fi calling.
4. If the option is not available, please contact support (you may need to replace your SIM card with a new one that supports VoLTE/VoWiFi).

How to enable Wi-Fi Calling on Android and iPhone

The activation process varies depending on the smartphone manufacturer. Let's look at step-by-step instructions for popular brands.

📱 Setup on iPhone (iOS 16 and later)

Apple supports Wi-Fi Calling on all models starting from iPhone 6To enable:

1. Open Settings → Phone → Wi-Fi Calling.
2. Activate the switch Wi-Fi calling on this iPhone.
3. In the window that appears, click Turn on.
4. Confirm your emergency address (required for 911/112 services).

After activation, the following message will appear in the status bar: Wi-Fi next to the operator's name.

🤖 Setting up on Android (Samsung, Xiaomi, Google Pixel, etc.)

The interface on Android may differ. General outline:

1. Go to Settings → Connections → Mobile Network → Wi-Fi Calling (For Samsung).
2. Or: Settings → SIM cards & mobile network → Advanced → Wi-Fi calling (For Xiaomi/Redmi).
3. Select a SIM card (if you have more than one).
4. Activate the option and confirm the address for emergency services.

For Google Pixel the path is this: Settings → Network & Internet → Mobile Network → Advanced → Wi-Fi Calling.

⚠️ Possible problems and solutions

If Wi-Fi Calling doesn't turn on, check:

• 🔄 Software updates — There may be no support on older versions of Android/iOS.
• 📶 Availability of VoLTE — Wi-Fi Calling often requires activated 4G voice transmission.
• 🔧 Operator settings — some tariffs block this function (check with support).
• 📱 Phone model - budget devices (for example, Realme C-series or Nokia 1.x) may not support VoWiFi.

What to do if calls are dropped?

If you experience interference or dropouts during a Wi-Fi Calling call, try:

1. Reconnect to another Wi-Fi network (the current one may be overloaded).

2. Disable VPN (some services block VoWiFi).

3. Enable "Prefer mobile network" mode in the Wi-Fi Calling settings (if available).

4. Update the router firmware (outdated firmware may cause lags).

Wi-Fi Calling without a SIM Card: Is It Possible?

Yes, some operators allow calling over Wi-Fi. without a physical SIM card, but with conditions:

• 🔐 Availability eSIM (virtual SIM card) linked to your number.
• 📱 Phone support eSIM (most flagships after 2019).
• 🏢 Operator support for virtual lines (check with your local phone store).

Example: MTS And Beeline They offer to register an eSIM for an existing number. After activation:

1. Download the eSIM profile through the official app.
2. Install it on your phone (in SIM card settings).
3. Turn on Wi-Fi Calling - calls will work even without a physical SIM card.

⚠️ Please note: Wi-Fi Calling will not work without a SIM card (even a virtual one). This is not the same as messaging apps like Viber — here you still need to link to a mobile number.

Wi-Fi Calling Security: Myths and Reality

Many users fear that Wi-Fi calls are less secure than cellular calls. Let's find out if this is true:

How is security ensured?

• 🔒 Traffic is encrypted using the protocol IPSec (the same level of protection as in banking applications).
• 🛡️ Authentication is done via a SIM card (or eSIM), just like in a regular network.
• 🌐 Data is transmitted through the operator's secure gateways, not through public servers.

Possible risks:

• 🕵️ If you are connected to public Wi-Fi (For example, in a cafe), traffic could theoretically be intercepted. However, to do so, an attacker would need to crack the IPSec encryption, which is extremely unlikely.
• 📡 If your router is infected with a virus, it may be redirecting your traffic. The solution is to use only trusted networks.

For maximum safety:

• 🔄 Update your phone and router firmware regularly.
• 🛡️ Do not connect to open Wi-Fi networks without a password.
• 🔐 Use a VPN (but keep in mind that some carriers block Wi-Fi Calling when a VPN is active).

Wi-Fi Calling vs. VoLTE vs. VoIP: What's the Difference?

These technologies are often confused, but they solve different problems:

The main difference between Wi-Fi Calling and VoIP is that you call regular phone numbers, not messaging accounts. Moreover:

• 📞 The subscriber will see your real number (and not "Unknown" or ID WhatsApp).
• 💰 Calls are charged at the mobile operator's rate (and not as Internet traffic).
• 📶 You can call short numbers (112, 911) and bank support services.

VoLTE and Wi-Fi Calling often work together: if you start a call on 4G (VoLTE) and the signal drops, the phone can automatically switch to Wi-Fi without losing the connection.

FAQ: Frequently Asked Questions about Wi-Fi Calling

❓ Can I use Wi-Fi Calling abroad?

Yes, but there are some nuances:

• If you are connected to a local Wi-Fi network, calls will be charged as domestic calls (according to your plan's rules).
• Some operators may block this feature while roaming – check in advance.
• For emergency calls (112, 911) a local number may be used, not the Russian one.

❓ Why isn't Wi-Fi Calling working on my phone?

The reasons may be as follows:

• Outdated firmware (update your phone).
• The operator does not support the technology (check your tariff).
• The SIM card is not compatible with VoLTE/VoWiFi (replace it at a mobile phone store).
• VoLTE is disabled in the phone settings (enable it in the mobile network menu).

If nothing helps, contact your operator's support team—the service may need to be activated manually.

❓ Is it possible to call another city/country via Wi-Fi Calling?

Yes, calls are charged as usual:

• To numbers in your region - at the rate (possibly free).
• To other cities in Russia - as long-distance (if unlimited is not included).
• To international numbers - at international call rates.

Check the terms and conditions in your operator account—some plans include unlimited calls within Russia, even over Wi-Fi.

❓ How do I disable Wi-Fi Calling?

To deactivate the feature:

• On iPhone: Settings → Phone → Wi-Fi Calling → turn off the switch.
• On Android: Settings → Mobile Network → Wi-Fi Calling → deactivate the option.

Once disabled, calls will only be made via the cellular network (if available).

❓ Does Wi-Fi Calling drain my phone's battery?

No, technology does not increase battery consumption compared to regular calls. Moreover:

• When the cellular signal is weak, the phone uses a lot of energy searching for it. Wi-Fi Calling in this situation saves charge.
• If you call over Wi-Fi in an area with good 4G, battery consumption will be about the same.