Modern mobile communications have evolved from a simple means of voice communication into a complex digital service that requires a stable, high-quality connection. However, even in large cities, there are "dead zones" where the cellular signal disappears, and in private homes or offices with thick walls, reception often drops to critical levels. It's in these situations that technology comes to the rescue. Voice over Wi-Fi, allowing you to make and receive calls over your home or office wireless network.
Operator MTS is actively implementing this feature, providing subscribers with the ability to stay connected even in the complete absence of cellular network coverage, as long as they have internet access. VoWiFi technology does not consume traffic from your main package of megabytes, but is charged as regular call minutes according to your tariff plan. This means that connection quality becomes directly dependent on the speed and stability of your router, rather than the proximity of a cell tower.
In this article, we'll detail how to activate the service, the smartphone and SIM card requirements, and address common setup errors. You'll learn how to check if your device supports the feature and what to do if the Wi-Fi calling icon doesn't appear on the screen.
What is VoWiFi and how does it work with MTS?
Technology VoWiFi (Voice over Wi-Fi) is the transmission of voice traffic via an internet protocol, similar to how popular instant messaging apps work, but integrated directly into the smartphone's standard dialer. For the subscriber, it feels just like a regular call: you dial the number, see the connection status, and end the conversation as usual, without launching third-party apps like Skype or WhatsApp. Operator MTS Uses secure communication channels to encrypt voice data, ensuring conversation confidentiality.
The main advantage of this technology is the ability to use a single phone number in areas with poor reception. If you're in a basement, a remote office, or a country house with only 2G coverage or no coverage at all, your smartphone will automatically switch to Wi-Fi to connect the call. This is especially important for those with unlimited calling plans, as it saves battery life, which is typically drained quickly by constantly searching for a network in poor signal conditions.
⚠️ Attention: This feature only works if your device has Wi-Fi enabled and an internet connection. If you leave the router's range, the call may be disconnected or switch to a cellular network (VoLTE), if supported by your device and local coverage.
It's important to understand that the service requires support from three components: the operator itself, your smartphone, and your SIM card. MTS Provides network-based support, but settings may vary depending on the device model. For example, some devices require manual activation in the menu, while others receive settings automatically via OTA.
Checking device and SIM card compatibility
Before you begin setting things up, you need to make sure your equipment is technically ready to work with modern voice transmission protocols. Not all smartphones, even those released several years ago, support VoWiFiThis primarily applies to budget models or devices intended for sale in markets outside Russia where this technology has not yet been adopted by operators.
The SIM card also plays a crucial role: older Mini-SIM cards or early versions of Micro-SIM may not support the necessary security and encryption protocols. If you're using a SIM card that's many years old, or if it's been manually cut to size, the chances of successfully activating the service are significantly reduced. In this case, it's recommended to replace the SIM card with a new one at a mobile store or through the operator's app.
To check the compatibility of your smartphone, you can use the following list of popular brands and series that are guaranteed to support the function from your operator. MTS:
- 📱 Apple: iPhone 5c and newer (with the latest version of iOS).
- 🤖 Samsung: Galaxy S series (starting with S6), Galaxy Note, Galaxy A (mid-range and flagship segment).
- 🌐 Xiaomi: Most Mi and Redmi series models released after 2018 (especially global versions).
- 🇨🇳 Huawei/Honor: The flagship P and Mate series, as well as many Nova series models.
- 🇰🇷 LG/Sony: Flagship models of the last 5-6 years of production.
It's worth noting that even if a phone model is on the supported list, a specific model (for example, the version for the Chinese market) may not work with Russian operators in VoWiFi mode. It's also important to have the latest version of the operating system installed on your device, as protocol support is often added or improved through software updates.
Activation of the service on the operator's side
After checking the equipment, you need to make sure that the service is activated in the subscriber profile on the network side. MTSUnlike older services that required sending USSD codes, modern services often connect automatically the first time you try to use them on a compatible device. However, in some cases, confirmation is required through your personal account or by contacting customer support.
The most reliable way to check your connection status is to use the official app. My MTSIn the services section or in the app search, search for "Wi-Fi Calling." If the service is available for your plan, you'll see the option to enable it. For some legacy plans, this feature may be unavailable or require upgrading to the current plan.
An alternative method is to use a USSD command, which works even if the phone doesn't have internet access (as long as there's at least some network signal). To check and connect, the command is usually *111*1468# or something similar, the relevance of which is best clarified in the command help *111#After entering the command, a menu or message about successful activation will appear on the screen.
Setting up Wi-Fi calling on Android
In the operating system Android The process for enabling this feature can vary significantly depending on the OS version and smartphone model. Manufacturers often hide this setting in various menu sections, which can be confusing for users. Below is a general guide covering most modern devices.
The first step is to connect your smartphone to a Wi-Fi network. Without an active internet connection, the menu item may be grayed out or hidden. Then, go to the device's main settings. Look for a section called "Connections," "Network & Internet," or "Mobile Network." Depending on the manufacturer, the path may look different.
Find the switch labeled "Wi-Fi Calling." Toggle it on. If you can't find this option in the main menu, try searching for "Wi-Fi" or "Calling" in Settings. On some devices (such as Samsung), this option may be located directly in the Phone app.
☑️ Android Setup Checklist
For smartphone owners Samsung the path often looks like this: Settings → Connections → Wi-Fi Calling. U Xiaomi And Redmi the following path is often encountered: Settings → SIM cards and mobile networks → Wi-Fi callingOn devices with "pure" Android (Pixel, Motorola), the option is usually located in the section Network and Internet → Mobile Network.
⚠️ Attention: Operating system interfaces and shells are constantly updated. The location of menu items may change with the release of new Android versions. If you can't find the path described above, use the search within your phone's settings.
Instructions for iPhone (iOS) owners
Devices Apple are famous for their unified system of settings, so activation VoWiFi On iPhone, the process is virtually identical on all models, starting with the iPhone 5c. The main requirement is the latest version of iOS, as carrier support is added through software updates.
To enable this feature, open the standard Settings app and go to the Cellular section. Here, select Wi-Fi Calling. If you have a dual SIM card (or eSIM), make sure you're setting up the correct line. MTS, which you plan to use for calls.
Toggle the "Wi-Fi Calling" switch to the on position (green). The system may ask you to confirm your action, warning you that your location data will be shared with your carrier for emergency services. Confirm by tapping "Enable." After this, "Wi-Fi" may appear in the status bar next to your carrier's name.
What should I do if the Wi-Fi Calling option is missing on my iPhone?
If you don't see this option in your cellular settings, make sure you have the latest version of iOS installed. Also, check if the service is activated through your carrier's personal account. In rare cases, resetting your network settings or reinstalling the carrier profile, which comes automatically when you have internet access, may help.
An important feature for iPhone owners is the ability to choose their preferred network mode. In the call settings menu, you can select your preferred network type: "Wi-Fi Only" or "Cellular & Wi-Fi." The first option forces the phone to use only the wireless network for calls, which is useful in areas with very poor cellular coverage, but can result in calls being dropped when leaving the house.
Table: Comparison of operating modes and requirements
To better understand the differences between regular and wireless calls, as well as the equipment requirements, consider the comparison chart. It will help you quickly navigate the technical details.
| Parameter | Regular call (GSM/3G/4G) | Wi-Fi Calling (VoWiFi) | Call via messenger |
|---|---|---|---|
| Network requirement | Cellular operator coverage | Internet access (Wi-Fi) | Internet access (Wi-Fi/Mobile) |
| Tariffs | At the operator's rate | At the operator's rate (minutes) | Traffic consumption or free |
| Caller ID | The number is displayed | The number is displayed | Account/nickname is displayed |
| Sound quality | Depends on the tower load | Depends on the speed of the router | Depends on the application server |
From the table it is clear that VoWiFi It combines the convenience of traditional calls (billing per minute, caller ID) with the flexibility of internet technology. This makes it an ideal solution for users who spend a lot of time on the phone in areas with poor cellular coverage.
Solution and troubleshooting
Despite the technology's robustness, users may encounter difficulties setting it up or using it. One of the most common issues is the absence of the "Wi-Fi" icon or the handset with waves in the status bar after enabling the feature. This may indicate that the phone is unable to register with the carrier's network via the internet.
Often, the problem lies in your router settings. Some home internet providers use specific DNS settings or block certain ports required for VoIP traffic. Try rebooting your router or changing the DNS servers in your Wi-Fi connection settings to public ones (for example, Google's). 8.8.8.8). Also, make sure that Airplane Saving mode is disabled on your phone and location services are enabled, as some carriers require location access to route emergency calls.
Another common situation is that the feature is enabled, but calls aren't processed. In this case, check your account balance and ensure outgoing calls aren't blocked on your phone. It's also worth checking that your smartphone isn't in "Data Saver" or "Traffic Saver" mode, which can limit background activity from your carrier's services.
Frequently Asked Questions (FAQ)
Do you charge for Wi-Fi calls when roaming?
Yes, calls are charged according to your plan. However, when roaming, it's important to be careful: if you call a Russian operator while abroad, it may be considered an incoming or outgoing call while roaming, depending on the direction of the call. Check roaming pricing with your operator before traveling.
Does making Wi-Fi calls use up mobile data?
No, voice traffic is transmitted over Wi-Fi and doesn't consume your mobile data plan. However, data isn't transmitted over your carrier's internet connection, so your mobile data remains unaffected.
Can I use Wi-Fi calling if my SIM card is blocked?
No, your SIM card must be active to register for the VoWiFi network. If your number is blocked by your carrier or set to "incoming only," you won't be able to make outgoing calls over Wi-Fi.
Does VoWiFi technology affect battery life?
The impact is minimal and comparable to normal standby mode on a 4G network. In some cases, when the phone is in an area with very weak cellular coverage, using Wi-Fi for calls even saves battery life, as the communication module doesn't operate at maximum power searching for a tower.