Wi-Fi Calling: How to Enable and Set Up on Any Smartphone

Calls via Wi-Fi (or VoWiFi) is a technology that allows you to talk on the phone even without a mobile network. It's especially useful in places with poor coverage—basements, elevators, country houses, or abroad, where roaming is expensive. But how do you properly set up this feature on your device? In this article, we'll cover step-by-step instructions. Android And iPhone, as well as the nuances of working with different telecom operators.

Many users mistakenly believe that VoWiFi requires a special plan or expensive equipment. In fact, all you need is a modern smartphone (released after 2018) and a stable connection. Wi-FiHowever, there are some pitfalls: not all operators support the technology, and on some devices it must be activated manually. Below are details for each case.

What is VoWiFi and how does it work?

VoWiFi (Voice over Wi-Fi) is a communications standard that transmits voice calls over the internet instead of a cellular network. The technology uses the protocol IMS (IP Multimedia Subsystem), which is integrated into modern 4G/5G networks. Key advantages:

• 📶 Stable signal even where there is no mobile network (for example, in the metro or in the outback).
• 💰 Saving on roaming: Wi-Fi calls are not charged as international calls.
• 🔋 Less battery consumption compared to searching for a cellular network in poor coverage conditions.
• 📱 Smooth transition between Wi-Fi and LTE during a call (if the operator supports it) eSRVCC).

It is important to understand that VoWiFi is not the same, that calls are made via instant messengers (WhatsApp, Telegram, Viber). The latter require both the caller and the recipient to be online in the same app. VoWiFi, on the other hand, works like a regular mobile call: the caller will see your number, not your messenger account.

The technology is supported by most operators in Russia, but there are some nuances:

• 📡 MTS, Beeline, Megaphone And Tele2 They officially claim to support VoWiFi, but in practice its availability depends on the region and tariff.
• 🛠️ On some plans (for example, corporate or legacy ones), this feature may be disabled by default.
• 📱 The device must support IMS (most smartphones on Android 10+ And iPhone 6s+ (they are suitable).

⚠️ Attention: If you travel frequently, check with your carrier to see if VoWiFi works while roaming. Some providers block the feature abroad due to agreements with local networks.

How to check if your smartphone supports VoWiFi

Before setting up Wi-Fi calling, make sure your device is compatible with the technology. Here are the key criteria:

• 📱 Android: OS version not lower Android 9 Pie (for most brands). On Samsung, Xiaomi, Huawei And Google Pixel support appears with Android 10.
• 🍎 iPhone: models starting from iPhone 6s (2015) with established iOS 13+.
• 📡 Operator: The SIM card must be from a provider that supports VoWiFi (see the list below).

To find out for sure if your phone supports the technology, follow these steps:

1. On Android:

   Go to Settings → Network & Internet → Mobile network → Advanced → Wi-Fi callingIf this option is missing, your device does not support VoWiFi.

2. On iPhone:

   Open Settings → Cellular → Data Options → Wi-Fi CallingThe absence of the option means incompatibility.

⚠️ Attention: If your smartphone was released before 2018, even if you have the required OS version, VoWiFi may not work due to lack of hardware support. IMS.

Step-by-step VoWiFi setup on Android

The instructions may vary slightly depending on the smartphone manufacturer, but the general procedure is the same. Let's look at the universal method:

1. Open Settings and go to the section Network and Internet (or Connections on Samsung).

2. Select Mobile network → Additionally (on some phones the item is called SIM cards and mobile networks).

3. Find the option Wi-Fi calling or VoWiFi and activate it.

4. If the system asks for an emergency address, please provide your real address (this is a legal requirement in many countries, including Russia).

5. Restart your phone for the changes to take effect.

On some devices (eg. Samsung Galaxy) after turning on VoWiFi, an icon will appear Wi-Fi with a handset in the status bar. If it's not there, but the feature is enabled, don't worry: this is a firmware feature.

If calls don't go through after activation, try:

• 🔄 Switch airplane mode for 30 seconds and back.
• 📶 Manually select your carrier's network in the settings (sometimes the automatic selection fails).
• 📱 Update your smartphone software to the latest version.

⚠️ Attention: On Huawei And Honor without Google services (for example, on HarmonyOS) VoWiFi may work unstable or be absent altogether.

Setting up Wi-Fi calling on iPhone

On iPhone the process is simpler than on Android, thanks to the unified interface iOS. Follow the instructions:

1. Open Settings → Cellular communications.

2. Tap on the item Data parameters → Wi-Fi calling.

3. Activate the switch Wi-Fi calling on this iPhone.

4. If prompted, confirm that you want to enable the emergency calling feature.

Once activated, a message will appear at the top of the screen next to the network indicator. "Wi-Fi" (On some models, a handset icon will appear.) This means the function is working.

Features of VoWiFi on iPhone:

• 🔄 Calls automatically switch between Wi-Fi and cellular networks without interrupting the connection (if the operator supports it) eSRVCC).
• 📱 The function works even in the mode On the plane, if Wi-Fi is enabled.
• 🔒 For security, Apple encrypts voice traffic, making it virtually impossible to intercept conversations.

What to do if there is no VoWiFi option on iPhone?

If the point Wi-Fi calling not in the settings, check:

1. Update iOS to the latest version.

2. Make sure that your SIM card is activated (not "empty" or from another operator).

3. Reinstall the operator profile: Settings → General → Reset → Reset network settings.

4. If nothing helps, your carrier does not support VoWiFi for iPhone (rare, but it happens).

VoWiFi with Russian operators: MTS, Beeline, MegaFon, Tele2

In Russia, all major carriers officially support Wi-Fi calling, but there are some nuances depending on their rates and regions. Below is the current data at the time of publication:

To check if the feature is available to you, you can:

1. Call the operator's short number (for example, *111# For MTS) and check VoWiFi support.
2. Try enabling the function in your smartphone settings. If the option is active, then everything is fine.
3. Log in to your operator's personal account and check the service status (section "My Services" or "Communication Settings").

⚠️ Attention: If you use virtual operator (For example, Yota, Tinkoff Mobile), VoWiFi may be unavailable - check with support.

Common problems and their solutions

VoWiFi is enabled, but there are occasional glitches. Here are the issues and how to fix them:

• 🚫 Calls don't go through:

  Check if you're connected to Wi-Fi. If so, restart your router and smartphone. Also, make sure you have sufficient funds in your account (some VoWiFi plans block negative balances).

• 📵 No VoWiFi icon in the status bar:

  On some firmware versions, the indicator doesn't appear, but the feature still works. Check if calls are working over Wi-Fi (disable your mobile network and try making a call).

• 🔊 Poor connection quality:

  The problem may be with your router. Switch to a different band. 5 GHz (if supported) or move closer to the signal source. Also, check if the network is overloaded (for example, if you're watching 4K videos at the same time).

• ⚠️ The operator blocks VoWiFi:

  This happens on corporate or legacy plans. The solution is to upgrade your plan or contact support for manual activation.

If nothing helps, try resetting your network settings:

• On Android: Settings → System → Reset → Reset Wi-Fi, mobile networks, and Bluetooth.
• On iPhone: Settings → General → Transfer or reset iPhone → Reset → Reset Network Settings.

VoWiFi and Security: What You Need to Know

Wi-Fi calls are encrypted, but there are a few caveats to keep in mind:

• 🔒 Encryption: VoWiFi uses the protocol SRTP (Secure Real-time Transport Protocol), which protects voice traffic from eavesdropping. However, if you are connected to public Wi-Fi (for example, in a cafe), a man-in-the-middle attack is theoretically possible.
• 📍 Geolocation: When making emergency calls via VoWiFi, the operator transmits your address to emergency services (this is a legal requirement). Make sure your address is up-to-date in the settings.
• 🛡️ Router protection: If your Wi-Fi is hacked, attackers will be able to intercept your traffic. Always use WPA3 and a complex password.

VoWiFi doesn't work through VPN If you use a virtual private network, calls will be routed through the cellular network. This is a carrier limitation, as a VPN can mask your actual location, which is critical for emergency services.

To ensure maximum safety:

• 🔄 Regularly update your smartphone software and router firmware.
• 🚫 Avoid connecting to untrusted open networks for calls.
• 🔑 Use two-factor authentication in your operator account.

FAQ: Answers to frequently asked questions

Is it possible to make calls over Wi-Fi without a SIM card?

No, VoWiFi requires an active SIM card that supports the technology. However, you can use instant messaging apps (WhatsApp, Telegram) for calls without a SIM card, but these will not be mobile calls, but Internet calls.

Why doesn't VoWiFi work when roaming?

Some operators disable the feature abroad due to agreements with local providers. For example, MTS supports VoWiFi in roaming only in countries where there are partner networks with support IMSPlease check with your operator for the list of countries.

Can I use VoWiFi on a tablet?

Yes, if the tablet supports SIM cards and has a VoWiFi function (for example, Samsung Galaxy Tab S or iPad Pro with a cellular connection). The setup is similar to smartphones.

Are Wi-Fi calls counted as internet traffic?

No, VoWiFi uses a separate channel for voice calls and doesn't use up your data plan. Calls are charged like regular mobile calls (at your operator's rate).

What should I do if my mobile internet connection is lost after enabling VoWiFi?

This is a rare issue due to a settings conflict. APN. Try:

1. Disable VoWiFi and reboot your device.
2. Reset network settings (see instructions above).
3. Manually register APN operator (settings can be found on its website).