Many smartphone users are familiar with the situation of having excellent Wi-Fi coverage indoors, but no mobile service at all. In such cases, standard voice calls become impossible, and the internet quality is poor for staying connected. The solution to this problem lies in technology. VoWiFi, which allows voice traffic to be transmitted directly via an Internet channel.
Modern Android smartphones While this feature is supported at the hardware level, activating it often requires several additional steps on the subscriber's part. This isn't a simple menu setting, but a complex process that varies depending on the operator, device model, and region of use.
In this article we will discuss in detail how to activate Wi-Fi calls On different operating system versions, what conditions must be met, and what to do if the standard switch doesn't appear in the interface. Understanding how this technology works will help you stay accessible even in areas with poor cellular coverage.
What is VoWiFi and how does it work?
Voice over Wi-Fi technology, or VoWiFi for short, is a method of transmitting voice calls over IP protocols. Unlike popular messaging apps, which use their own servers and apps, VoWiFi is integrated directly into the standard phone book and dialing interface. To the other person, your call appears like a regular mobile call, not like a WhatsApp or Telegram call.
The principle of operation is that the voice signal is digitized, packaged into IP packets, and transmitted via a Wi-Fi access point to the telecom operator's servers. There, the signal is converted back to traditional telephony format or transmitted further over the VoLTE network. Key advantage is to use your existing tariff plan: minutes are spent in the same way as during a regular call, without additional charges for Internet traffic.
⚠️ Please note: Call quality directly depends on the stability and speed of your internet connection. If your connection is too slow, your voice may be interrupted or distorted.
It's important to note that this technology is closely related to VoLTE. Many operators view them as a single ecosystem product. If your operator supports High Definition Voice, the sound quality will be significantly higher than in traditional 2G and 3G networks. This ensures a more natural-sounding voice and a faster connection.
What's the difference between VoWiFi and instant messaging calls?
VoWiFi operates at the carrier level, using your regular phone number and plan minutes. Calls within messaging apps require both parties to install a separate app and use a service account, not a SIM card.
Operator and tariff plan requirements
Before setting up your smartphone, make sure your mobile operator offers voice calls over Wi-Fi. Not all providers support this feature, and even those that do may have restrictions based on region or plan line. In Russia, the major operators (the "big four") have already implemented this technology, but the service's status is subject to change.
VoLTE service often needs to be enabled on the SIM card to activate this feature. Without this basic requirement, the phone may not display the Wi-Fi calling option in the settings menu. You can check for service availability through your operator account or using a USSD command specific to your region.
It's also worth keeping in mind that some carriers require the device's IMEI code to be registered with their network for advanced communication features to work properly. If you recently changed your smartphone, you may need to wait a few hours or re-register the device with the carrier.
The table below shows examples of requirements from popular operators (data may be updated, please check the official websites for current information):
| Operator | The need for VoLTE | Additional payment | Regional restrictions |
|---|---|---|---|
| MTS | Recommended | No (according to the tariff) | Possible |
| Megaphone | Necessarily | No | Minimum |
| Beeline | Desirable | No | Depends on the zone |
| Tele2 | Yes | No | Eat |
Standard activation on stock Android and Pixel
On smartphones with a "clean" operating system, such as Google Pixel, Motorola, or Nokia, the process is usually very simple. The settings interface is uncluttered, and the desired option is logically located. First, make sure your phone is connected to Wi-Fi.
Open the app Settings and go to the section Network and InternetHere is an item that may interest you: Mobile network or SIM cardsIn some firmware versions, the toggle is located directly on the main communication settings screen. Look for an option called "Wi-Fi Calling" or "Wi-Fi Calling."
After activating the slider, the system may ask you to confirm your address for emergency services. This is a standard safety procedure, as geolocation may be inaccurate when calling online. Enter a current address so emergency services can locate you if needed.
☑️ Check before switching on
If the phone icon with the Wi-Fi symbol doesn't appear in the status bar after turning it on, try restarting the device. Sometimes the phone needs time to register with the carrier's IMS network. Also, make sure that "Do Not Disturb" mode isn't blocking the display of service icons.
Setting up VoWiFi on Samsung Galaxy
Devices Samsung They have their own One UI shell, which differs slightly from stock Android in the layout of controls. Here, settings are often duplicated or hidden in extended menus. To enable this feature, go to Settings and select Connections.
In the menu that opens, find the item Wi-Fi callingIf you don't see it right away, click the three dots in the upper right corner or select Mobile networkOn some models, the switch may be located directly in the quick settings drawer. To do this, unlock the screen, swipe down twice, and find the phone icon with a Wi-Fi symbol.
An important feature for Samsung owners is setting network priority. In the function menu, you can select your preferred connection type: "Mobile network," "Wi-Fi," or "None." Selecting a mode Prefer Wi-Fi guarantees that if there is a wireless network, the call will go through it, even if the cellular signal is weak.
⚠️ Note: On some Samsung models intended for certain markets, the menu may be called "Wi-Fi Calling" in English, even if the system interface is localized in Russian.
If you have a dual-SIM phone, the settings are applied individually to each SIM card. Be sure to check the service status for both numbers if you plan to use them simultaneously. You can set up separate rules for each card when switching between networks.
Interface Features on Xiaomi, Redmi, and POCO
The company's smartphones XiaomiMIUI and HyperOS-based devices have their own specific features. Settings are often hidden in the SIM card menu. Go to Settings, select SIM cards and mobile networksNext, you need to select the specific SIM card for which you want to set up calls.
Inside the SIM card menu, look for the item Wi-Fi callingIf it's not there, try searching through the settings: enter "Wi-Fi" or "VoWiFi" in the search bar. The system will automatically tell you where to find the switch. On some global firmware versions, this feature may be hidden by default.
Xiaomi users often encounter a situation where the option is present but not activated. In this case, changing the region in the phone settings helps. Go to Settings -> Additionally -> Region and select a country where the service is known to work (for example, India or Indonesia, if your operator is represented there, or simply change it to "Singapore").
After changing the region, your phone may require a reboot. Check the SIM card menu again. If the switch appears, activate it, and then you can change the region back. In most cases, the setting is saved and continues to work.
Troubleshooting: Function does not turn on or is missing
The most common issue is a missing menu item in the phone settings. This often indicates that your device's firmware doesn't contain carrier profiles for your region. In this case, you may need to update the software or upgrade to the global firmware version.
Another common cause is outdated network settings. Carriers periodically change access parameters. To update them, go to your mobile network settings and find "Access Point Names (APN)." Tap the menu (three dots) and select Reset to default settingsAfter this, restart your smartphone.
If the icon is lit but calls aren't connecting, check your firewall or antivirus settings. Sometimes they can block ports needed for voice traffic. Also, try disconnecting and reconnecting Wi-Fi to allow your phone to re-authenticate with the network.
In rare cases, the problem lies with data roaming. Even if you're at home, VoWiFi may require data roaming to be activated (but not necessarily enabled) in your SIM card settings. This allows your phone to exchange service signals with your carrier's home network via a third-party internet channel.
Frequently Asked Questions (FAQ)
Is there an extra charge for Wi-Fi calls?
No, operators don't charge extra for the technology itself. Minutes are charged according to your plan, just like a regular call. However, if you're roaming internationally, the rules may differ: incoming calls via Wi-Fi may be free, while outgoing calls will be charged as if you were calling from your home country.
Is it possible to make calls via Wi-Fi if the SIM card does not see the network (no signal)?
Yes, this is one of the main advantages of this technology. If your phone shows "No service" or "Emergency calls only," but is connected to Wi-Fi and the service is activated, you will be able to make and receive calls. The phone will use the internet connection to transmit voice calls.
Does VoWiFi affect traffic consumption?
Technically, data usage is used, but carriers typically don't charge for it if calls are made to numbers within their network or within the country. Data usage occurs in the background, but its volume is negligible compared to video or music. The main thing is a stable internet connection.
What should I do if my phone switches to 3G/4G during a call?
This happens if the Wi-Fi signal becomes too weak during a call, and Wi-Fi isn't strictly preferred in the priority settings. The phone may also switch if the internet connection quality drops below the threshold required for voice transmission.