How to connect SMS via MTS Wi-Fi: A complete guide

In dense urban areas or remote locations from base stations, users often experience a lack of cellular signal, while their home internet continues to function reliably. Voice over Wi-Fi (VoWiFi) allows you to make calls and send text messages using only a wireless connection to your router, a real lifesaver in areas with poor coverage. Mobile operator MTS is actively implementing this feature, allowing subscribers to stay connected even in basements or deep wells where a regular GSM signal can't penetrate.

Connecting the service opens access to HD voice and quick messaging without having to switch to third-party messaging apps or look for a spot with better reception near a window. For this feature to work properly, it's important that your device supports the VoWiFi standard and that the correct carrier network settings are configured in your smartphone's settings. In this article, we'll cover how to activate the service, check your device's compatibility, and troubleshoot common setup errors.

It's worth noting that data transfer via Wi-Fi roaming may be charged differently than regular calls, so it's recommended to check your plan's terms before enabling this feature. Modern smartphones automatically detect the availability of a Wi-Fi calling network and prioritize it over a cell tower, ensuring seamless transitions between networks without connection interruptions during a call. The main requirement for use is the activated "Wi-Fi Calling" service in your personal account and the option enabled in the phone's menu.

Technical requirements and device compatibility

The first step before setup is to check your hardware compatibility, as not all smartphone models support the VoWiFi protocol at the software level. MTS supports the technology on most modern Android and iOS devices released in the last few years, but the list may vary depending on the specific model. It's important to keep your operating system updated to the latest version, as support for the feature is often added through security patches or major firmware updates.

iOS devices require an iPhone 5c or newer with iOS 13 or later, and a carrier approved by Apple for your region. Android smartphone owners should check for the feature. Wi-Fi Calling In the default network settings, which may have different names depending on the manufacturer's operating system (MIUI, OneUI, ColorOS). If your device was purchased from an authorized dealer in Russia, the likelihood of full compatibility is close to 100%, while imported versions may require manual flashing or region changes.

⚠️ Note: On some custom Android firmware versions, this feature may not work reliably or may not work at all. For guaranteed results, we recommend using the stock firmware version.

Furthermore, the router through which the connection is established must correctly handle SIP protocols and not block the ports required for voice traffic. In most cases, home routers are configured correctly by default, but in corporate networks or public access points, administrators may limit VoIP traffic to save bandwidth.

• 📱 The smartphone must support the 4G/LTE standard and have an unlocked SIM card slot.
• 📶 The Wi-Fi Calling service must be technically available in your region.
• 🔐 The device must have a valid operator security certificate installed (usually downloaded automatically).
• 🔄 The phone firmware must be updated to the latest available version from the manufacturer.

Activation of the service in your personal account and via USSD

Before setting up your phone, you need to make sure the service is already activated for your number with your carrier. MTS offers several convenient subscription management options, allowing you to activate the service in just a few clicks without visiting a mobile phone store. The fastest method is using a USSD command, which works even without internet access but requires a cellular signal to process the request.

To activate via the phone menu, dial the command *111*1966# and press the call button, after which a confirmation SMS message will appear on the screen. Alternatively, you can use the My MTS mobile app. In the "Services" section, you can find the "Wi-Fi Calling" option and activate it using the slider. This is especially convenient if you're in an area with poor cellular coverage but are already connected to Wi-Fi, as the app works over the internet.

If you use a computer, log in to your personal account on the operator's official website, go to the service management section, and find the communications section. You can also review the tariff terms in detail there, as this option may be unavailable in some archived tariffs or may require upgrading to a new service plan. After activation on the operator's side, the system may request confirmation via a code sent via SMS to your number.

• 📲 In the "My MTS" app, go to the "Services" section and select a communication category.
• 🔍 Find the "Calls and SMS via Wi-Fi" option and click the "Connect" button.
• ✅ Wait for an SMS notification about successful service activation.
• 📞 Check the service status by dialing the combination *111*1966*1# to obtain information.

Setting up an Android smartphone

After activating the service with your carrier, you need to properly configure your smartphone to use the wireless network for voice and messaging. On Android devices, the path to settings may vary slightly depending on the operating system version and the manufacturer's custom user interface (Samsung, Xiaomi, Huawei, etc.). The basic procedure involves finding the mobile networks section and turning on the corresponding toggle switch.

Open the "Settings" menu, go to "Connections" or "Mobile Network," and find "Wi-Fi Calling." Turn on the switch, and the system may prompt you to select a network priority: we recommend setting it to "Prefer Wi-Fi" or "Wi-Fi Only" if you're in an area with a very weak cellular signal. Some phone models, such as Xiaomi or Redmi, may require you to additionally enable data transfer for the MTS SIM card, even if you're using Wi-Fi.

If the standard method doesn't work, try searching your phone's settings by searching for "Wi-Fi" or "VoWiFi." On stock Android devices (such as Pixel and Motorola), the settings are often hidden in the phone menu: open the Phone app, tap the three dots in the corner, select "Settings," and find the appropriate section. Once enabled, a handset icon with a Wi-Fi symbol or the text "MTS Wi-Fi" should appear in the status bar.

⚠️ Note: Settings interfaces may change with operating system updates, so if you don't find the item right away, check the "About phone" section for software updates.

For subscribers using dual SIM devices, it's important to check the settings for each SIM card separately, as parameters may be reset when switching. In rare cases, manual APN settings may be required, although modern smartphones load them automatically when first connecting to the carrier's network.

• 🛠 Go to “Settings” → “SIM cards and mobile networks”.
• 📡 Select your MTS SIM card and find the "Wi-Fi Calling" option.
• 🔌 Turn on the feature and select the "Always prefer Wi-Fi" mode.
• 📱 Make sure the corresponding indicator appears in the notification shade.

Instructions for iPhone (iOS) owners

Apple smartphone owners are fortunate to have a more unified interface, where setting up the feature takes just a few seconds and doesn't require diving deep into technical menus. For VoWiFi to work on an iPhone, the device must be unlocked for its carrier or support Russian SIM cards without restrictions. The activation process is as automated as possible: after enabling the service on MTS, simply toggle the switch in the settings.

Go to Settings → Cellular (or Mobile Data), select your MTS SIM card. Find "Wi-Fi Calling" and toggle "On This iPhone." The system may ask you to verify your emergency address (E911), which is a standard security procedure required by carriers in many countries. Once enabled, "MTS Wi-Fi" will appear in the status bar next to the carrier's name in the upper left corner of the screen.

What should I do if the Wi-Fi Calling option is missing on my iPhone?

If you don't see this option, make sure the service has been activated by your carrier (via a command or in the app). Also, check that iOS is updated to the latest version. In rare cases, resetting network settings may help: Settings → General → Transfer or reset iPhone → Reset → Reset network settings. Note: This will delete saved Wi-Fi passwords.

A unique feature of iOS is the ability to use the "Wi-Fi on Other Devices" feature, which allows you to receive calls and text messages on your iPad or Mac if they are linked to the same Apple ID and on the same Wi-Fi network. This creates a unified communications ecosystem, ensuring you won't miss an important call, even if your phone is in another room. For this feature to work, all devices must be authorized under the same iCloud.

Using the MTS Connect app

If your smartphone doesn't support native VoWiFi technology or you want a unified communications platform on your tablet and laptop, the MTS Connect app is an excellent solution. This software allows you to make calls and send SMS directly over the internet using your mobile phone number, regardless of whether your device has a SIM card. The app is available for Windows, macOS, Android, and iOS.

To get started, download the app from the official website or app store, install it, and log in using your MTS phone number. You'll receive an SMS with a confirmation code, which you must enter in the appropriate field. After authorization, all incoming calls will be routed to your device, and outgoing calls will be identified as coming from your mobile number. This is the ideal solution for those who work on a computer and don't want to be constantly distracted by their phone.

It's important to note that the app requires a stable internet connection, but it doesn't rely on cellular signal strength, as it uses only IP. In the app settings, you can configure notifications for new SMS and missed calls, as well as sync contacts. This allows you to fully transfer your communication to the big screen, which is especially convenient for business correspondence.

• 💻 Download and install the MTS Connect app on your PC or tablet.
• 📲 Enter your phone number and confirm your login with the code sent via SMS.
• 🎧 Set up your microphone and speaker in your device's settings.
• 📩 Receive and send SMS messages directly from your computer or tablet.

Diagnosing problems and troubleshooting errors

Despite the ease of setup, users may encounter situations where the feature doesn't activate or works intermittently. Most often, the issue stems from incorrect APN settings or network profile conflicts. If the VoWiFi indicator doesn't appear, try restarting your smartphone or temporarily disabling and re-enabling AviaSoyuz mode to force re-registration with the network.

Another common cause is blocked ports on the router or home internet provider. If you're using corporate Wi-Fi or complex traffic filtering systems, the SIP protocol may be blocked by the network administrator. In this case, try switching to a mobile hotspot from a different phone or using a different provider's home network to test.

It's also worth checking that power-saving mode isn't enabled on your phone, as this can limit background network activity. In rare cases, deleting the old carrier profile and reinstalling it by resetting the network settings can help. If all else fails, contact MTS technical support, as the issue may be with the base station or your account.

Why haven't I received an SMS for activation?

SMS delays may be due to operator overload or issues on your device (message memory is full). Try sending a paid SMS to any number or restarting your phone. If the issue persists for more than 15 minutes, activate the service through the My MTS app without a confirmation code.

Does making calls over Wi-Fi use up data?

Yes, calls and text messages over Wi-Fi consume data, but this data is consumed from your basic MTS data plan. If you have an unlimited plan, there's nothing to worry about. If your data is limited, keep in mind that a minute of HD call consumes approximately 1-2 MB of data.

Does the service work abroad?

Yes, this feature works in international roaming if your phone and the foreign operator's network support VoWiFi. In this case, the call is considered incoming and outgoing as if it originated in Russia (according to your plan), allowing you to save on roaming charges. However, it's best to check the exact terms before your trip.

Is it possible to use the function without a SIM card in the phone?

The native VoWiFi feature requires a SIM card to be present in the device for authorization. However, the MTS Connect app allows you to use the number on other devices (tablets, PCs) even if the SIM card is physically located elsewhere, provided it is initially linked.