Modern smartphones Samsung Mobile phones offer numerous hidden features that significantly improve call quality but often remain misunderstood by users. One such feature is VoWiFi, or "Wi-Fi Calling," which allows calls to be made over a wireless network, bypassing cellular coverage restrictions. MTS subscribers may notice a corresponding icon appearing in the status bar or see the option in the settings menu, raising many questions about its purpose and cost.
The technology essentially transmits voice traffic over an internet protocol, similar to how messaging apps work, but using a standard phone book and dialing system. This solution is ideal for areas with poor cellular signal but stable internet access, such as basements, offices with thick walls, or country houses. Understanding how this feature works will not only help you conserve battery life but also stay connected in situations where regular calls are impossible.
In this article, we'll take a detailed look at what Wi-Fi call notifications mean on Samsung devices, how to properly activate the service for MTS SIM cards, and the specifics of billing. We'll also cover common connection issues and troubleshooting methods to ensure you get the most out of your smartphone. A deep dive into network settings will allow you to manage your costs and connection quality.
VoWiFi Technology: How It Works on Samsung Smartphones
Technology Voice over Wi-Fi (VoWiFi) is a standard for transmitting voice traffic over wireless networks. Unlike popular apps like WhatsApp or Telegram, it doesn't require any separate software or an account on the other end. For the user, the call process is identical to a regular call: you open a standard Telephone, dial the number, and wait for a response. The only difference is that the signal goes through your router, not the cellular operator's base station.
Smartphones Samsung have deeply integrated support for this feature at the operating system and modem levels. This ensures seamless switching between networks. If you're talking while within Wi-Fi range and then go outside where the wireless signal disappears but a strong 4G/LTE connection appears, the conversation won't be interrupted. The system will automatically switch the data stream to the cellular network using VoLTE technology, if it's also activated.
Particular attention should be paid to connection security. Voice transmission is encrypted by the operator, making conversation interception extremely difficult, unlike some third-party apps. However, for this feature to work, the router itself must support certain protocols and not block specific ports necessary for prioritizing voice traffic.
It's important to understand that enabling this feature doesn't mean your phone will always make calls over Wi-Fi. Priority is given to the cellular network if its signal is stable and sufficient for making a call. Switching to Wi-Fi only occurs automatically if the cellular signal becomes critically weak or disappears completely, but the device is connected to a known Wi-Fi network.
Benefits of using Wi-Fi Calling for MTS subscribers
For MTS mobile operator customers, using Wi-Fi calling offers a number of significant advantages, especially in dense urban areas or remote locations. The main advantage is the ability to stay connected in "dead zones" where the cellular signal doesn't penetrate floors. This is especially true for owners of apartments on the ground floors, residents of gated communities, and employees of offices located deep within buildings.
Another important aspect is battery conservation. When a smartphone is in an area with extremely weak cellular signal, it works harder, constantly trying to find a base station. This leads to rapid battery drain and overheating. Switching to a stable Wi-Fi connection reduces the load on the phone's radio module, allowing the device to last longer.
- 📶 Improving sound quality: Wi-Fi networks often offer higher quality audio encoding (HD Voice), making conversations clearer and more natural than standard GSM calls.
- 🌍 Unlimited roaming: While abroad, you can make and receive calls to your Russian number via Wi-Fi in a hotel or café at the rates of your home region, avoiding international roaming costs.
- 🔋 Reducing the load on the device: A stable connection via a router prevents constant surges in the smartphone's transmitter power, which extends battery life.
It's worth noting that MTS charges for Wi-Fi calls exactly as per your basic plan. Minutes are consumed from the bundle included in your plan, just as if you were calling over a regular cellular network. The operator doesn't charge a separate fee for using VoWiFi technology.
How to enable and set up Wi-Fi calling on Samsung
Activating the function on smartphones Samsung This usually happens automatically after the carrier sends the necessary configuration profiles. However, in some cases, manual configuration or parameter verification is required. Before beginning the procedure, make sure your MTS SIM card supports the service and that your phone has the latest software update.
To enable this feature, go to your device's main settings. The path may vary slightly depending on your shell version. One UI, but most often it looks like this: Settings → Connections → Wi-Fi CallingIf you don't find this option right away, use the settings search by entering "Wi-Fi" or "VoWiFi."
In the menu that opens, toggle the switch to the on position. You can also select your preferred network type for making calls. Options include "Mobile network preferred," "Wi-Fi preferred," or "Wi-Fi only." For most users, the first option is the best choice, as it balances connection quality and battery life.
☑️ Check before switching on
If after turning on the function the icon VoWiFi or Wi-Fi Call If the error message doesn't appear in the status bar, try restarting your device. Sometimes it takes time to register with your carrier's network. Also, check that your Wi-Fi settings aren't set to "Data Saver" or that third-party VPN services are blocking your carrier's service ports.
Tariffs and cost of services from MTS operator
One of the most frequently asked questions from users is the cost of using the technology. MTS, like most major operators, positions VoWiFi as a free add-on. You are charged only for the minutes used, as defined by your tariff plan. If you have a minute bundle, those will be used first.
Particular attention should be paid to international calls. This is perhaps the most cost-effective use case. While abroad, you connect to a local Wi-Fi hotspot (hotel, cafe, home network). When you make an outgoing call to a Russian number, the system recognizes that you're using Wi-Fi Calling and charges the call per minute as a regular call within your home network, ignoring international roaming charges.
| Call type | Direction | MTS tariffs |
|---|---|---|
| Voice call | To Russian Federation numbers (while in the Russian Federation) | According to the plan tariff (package minutes) |
| Voice call | To Russian numbers (from abroad) | As a home region (with active Wi-Fi) |
| Incoming call | From anywhere in the world | Free (as usual) |
| Video call | Call designer | According to the operator's video service rates |
This is necessary for authorization in the operator's network, but traffic is not consumed, since the voice is transmitted via a Wi-Fi channel.
What happens if the minutes run out?
If your minutes are used up, Wi-Fi calls will be charged at the base rate per minute of your plan. This is still more affordable than the standard roaming rate when roaming.
Solution: The icon does not appear or the connection is interrupted
Despite the technology's robustness, users may encounter situations where the feature doesn't work correctly. If the Wi-Fi calling icon doesn't appear even though it's enabled in the settings, the phone's firmware may be incompatible with the carrier's current network settings. In this case, resetting the network settings may resolve the issue.
To do this, go to Settings → General Settings → Reset → Reset Network SettingsPlease note that this action will delete saved Wi-Fi network passwords and Bluetooth device settings, but will not affect your personal data, photos, or contacts. After rebooting, your phone will request the configuration from MTS again.
⚠️ Attention: If you have a dual-SIM phone, make sure the MTS SIM card is selected for calls. The feature may not activate if the primary voice card is from a different carrier that doesn't support VoWiFi for your model.
Another reason for connection interruptions could be low internet speed or high latency (ping). A stable connection is essential for a comfortable conversation. If the router is overloaded with downloads or 4K streaming, call quality may deteriorate. In such cases, the phone may attempt to switch to the cellular network, which, if the signal is poor, will result in the call being dropped.
Differences between VoWiFi and instant messaging calls
Many users confuse VoWiFi technology with WhatsApp, Viber, or FaceTime calls. The fundamental difference lies in the level of integration. VoWiFi works at the carrier and contact list level. You don't need the other person to have a specific app installed or to be online. You simply dial a number, and the system automatically selects the optimal route.
Additionally, Wi-Fi calling supports emergency services (112, 102, etc.), which is often not possible with third-party apps. The operator sees your number and can locate you for emergency services, even if you're on a Wi-Fi network. This is a critical safety aspect that can't be ignored.
- 📞 Versatility: You can call any number, including landlines and short number services, which is not available in messengers.
- 🔒 Identification: The person you're chatting with sees your real phone number, not a random ID or profile name.
- 📱 Work in the background: No need to open a separate application; call history is saved in the general dialer feed.
Thus, VoWiFi doesn't replace instant messaging apps entirely, but rather serves as a powerful complement, providing communication where conventional methods fail. It's a bridge between traditional telephony and modern internet technologies.
FAQ: Frequently Asked Questions
Does MTS charge an additional fee for connecting the service?
No, connecting and using Wi-Fi Calling is free. You only pay for the minutes you spend using your plan.
Does VoWiFi work if my phone is in airplane mode?
Yes, if Wi-Fi is manually enabled in airplane mode. In this case, the phone will use only the wireless network for calls, which is ideal for saving battery in cellular dead zones.
Why does the Wi-Fi Call icon appear and disappear?
This depends on the signal quality. If the phone "sees" a strong 4G/LTE signal, it prioritizes the cellular network to conserve router resources and battery life. The icon only appears when the phone decides to use Wi-Fi for voice traffic.
Is it possible to use Wi-Fi Calling abroad without roaming?
Yes, this is one of the best ways to save money. While staying in a hotel abroad, you can call Russian numbers at the rates of your home region, as long as you don't switch to a mobile network.
Does using VoWiFi affect internet speed?
The technology uses minimal traffic (about 1 MB per minute) but has high priority. This is unnoticeable on modern routers, but on weaker connections, you may experience a slight decrease in file download speed during a call.