Modern mobile communications are no longer limited to just cell tower coverage, and owners of flagship devices often notice a handset icon with a wireless network symbol in the status bar. Calling via Wi-Fi On Samsung, this is a technology that allows you to make voice calls and send SMS messages using an internet connection rather than a standard GSM or LTE cellular network. This is especially relevant for those who live in areas with unstable signal or are often in rooms with thick walls, where regular calls are often dropped.
The technology is known as Voice over Wi-Fi or in short VoWiFi, and it is integrated directly into the standard dialing interface, without requiring the installation of third-party applications such as instant messengers. Samsung Electronics Samsung is actively implementing support for this protocol in its devices, starting with the Galaxy S and Galaxy A series, ensuring seamless transition between Wi-Fi and mobile networks without interrupting the connection. Understanding how this feature works will help you stay connected even in the most remote corners of the building.
Device owners Samsung may notice that the sound quality when using HD Voice codecs Internet connection often outperforms regular cellular service, as a home router's throughput is typically higher than that of an overloaded base station. However, proper operation requires not only a compatible smartphone but also support from your mobile operator, which is critical.
How VoWiFi technology works on Samsung devices
Fundamental difference of technology VoWiFi from the usual calls through Viber or WhatsApp lies in the level of integration with the operating system. When you activate the Wi-Fi calling feature on Samsung Galaxy, the phone redirects voice traffic through a secure tunnel to the operator's network, bypassing standard radio channels. For the user, this process is transparent: you simply dial the number, and the call is connected, even if the screen displays a Wi-Fi icon instead of the antenna bars.
The key element here is IMS (IP Multimedia Subsystem) — a subsystem that manages multimedia services in IP networks. It is this that allows a smartphone Samsung Authenticate with the operator's network via the internet. It's important to understand that the call is still charged according to your basic plan, like a regular voice call, and not as internet traffic, making this technology cost-effective.
⚠️ Please note: Even though the call is made over the internet, it still uses data. Make sure you have an unlimited data plan or are connected to your home network to avoid unexpected charges, especially when roaming.
Modern processors Exynos And Snapdragon, used in smartphones Samsung, have hardware support for high-resolution codecs, which provides crystal clear sound. Security protocol In this case, it is also enhanced, as data is encrypted during transmission from the device to the operator's gateway, protecting your privacy from interception on open networks.
- 📡 Seamless switching: The technology allows you to switch from Wi-Fi to LTE and back during a single conversation without interrupting it if the signal of one of the networks becomes weaker.
- 🔊 High quality: Wideband audio support provides a more natural sounding voice compared to the narrowband GSM codec.
- 🌍 Global availability: The feature works while roaming in many countries, allowing you to receive calls just like you would at home, eliminating the need to look for a local SIM card.
Compatibility of operators and smartphone models
Not all models Samsung and not all mobile operators support the function VoWiFi"out of the box." Typically, this technology is installed on devices released after 2016 that run the operating system Android version 6.0 and higher, but the software shell One UI must contain the appropriate settings. Carriers must implement IMS profile support for specific device models, so the list of compatible phones may be updated.
In Russia and the CIS, the major operators (the "Big Four") have supported this feature for several years, but activation may require specific steps. For example, for some plans or regions, the service may be hidden by default. For owners Samsung Galaxy S20, S21, S22, S23 and newer series, as a rule, you don't need to do anything except turn on the switch in the settings if the operator automatically pushes the profile.
There's also a nuance with device branding. If you bought a phone Samsung, intended for the market of another country (for example, the USA or Korea), the settings menu may differ, and support for local operators may not be available without reflashing. Regional features Firmware often detects the presence of the "Wi-Fi Calling" item in the menu.
| Operator | VoWiFi support | Necessary actions | Service status |
|---|---|---|---|
| MTS | Full | Enable in phone settings | Active by default |
| Beeline | Full | Activation via app or USSD | Activation required |
| Megaphone | Full | Enable in the smartphone menu | Active by default |
| Tele2 | Full | Check model compatibility | Depends on the region |
For corporate clients and users of older tariff plans, connection conditions may differ. We recommend checking your personal account or contacting your operator's technical support to confirm that the service has been activated. VoWiFi on your number. Sometimes you need to send a special USSD request or update the network profile through the SIM card settings.
List of popular Samsung models with full VoWiFi support
Galaxy S10 and later, Galaxy Note 10 and later, Galaxy A50 and later (depending on region), Galaxy Z Fold/Flip all models.
Step-by-step instructions for activating the function
The process of enabling Wi-Fi calling on smartphones Samsung standardized, but the menu layout may vary slightly depending on the version One UIFirst, make sure your smartphone is connected to a wireless network and the SIM card is active. Then, go to the device's main settings menu.
Find the section Connections (Connections) and select the item Wi-Fi calling (Wi-Fi Calling). If this option isn't in the main menu, try searching for "Wi-Fi Calling" in the settings search. In the window that opens, move the slider to the "On" position.
☑️ VoWiFi Activation Checklist
Once activated, a corresponding icon should appear in the status bar at the top of the screen. If the icon doesn't appear, your current carrier may not support the technology in your location or a device reboot may be required. It's also worth checking whether your smartphone is set to "4G/LTE Only" mode, as this can block VoWiFi in some configurations.
In some cases, especially on custom firmware or devices purchased abroad, the menu may have a different name. Look for the section Telephone -> Settings (three dots in the corner) -> AdditionallyThat's where the switch is often hidden. Wi-Fi CallingIf there's nothing there either, it's likely that your region's firmware isn't certified for use with these operators.
⚠️ Note: The settings interface may change depending on software updates. If you don't see the menu item, check for system updates in the section
Software update.
Setting network priority and operating modes
In the function settings menu Wi-Fi calling on Samsung Additional settings are often available that determine the smartphone's behavior in both signal types. The user can select the preferred network type for making calls. This allows for flexible management of battery life and connection quality.
The following options are typically available: "Mobile network preferred," "Wi-Fi preferred," or "Wi-Fi only." Selecting "Wi-Fi only" is useful when you're in an area where the cellular signal is present but extremely weak and constantly drops, while Wi-Fi is stable. In this mode, the phone will ignore the cellular network for voice calls.
- 📶 Mobile network is preferred: The phone will use cellular data even if Wi-Fi is available, switching to Wi-Fi only when there is no signal from the tower at all.
- 📶 Wi-Fi network is preferred: Priority is given to the wireless network, which often provides better sound quality in the room.
- 🔒 Airplane mode with Wi-Fi: Allows you to make calls exclusively over the Internet, completely disabling the cellular radio module to save energy.
It is important to note that when choosing Wi-Fi priority, the phone may scan for networks more often, which theoretically can slightly increase power consumption, although modern chipsets Samsung They handle this task effectively. Experiment to find the mode that works best in your home or office.
Advantages and Disadvantages of Using VoWiFi
Use of technology VoWiFi on devices Samsung Wi-Fi offers a number of undeniable advantages, the most important of which is coverage. In buildings with thick concrete walls, metal frames, or in remote rural locations where cellular signal is barely detectable, Wi-Fi is often the only means of communication. This turns a smartphone into a fully functional phone, even in dead zones.
Sound quality is another important aspect. Since internet channels today have high bandwidth, high-resolution codecs are used, eliminating the "tinny" sound typical of GSM communications. Furthermore, the technology allows for simultaneous use of high-speed internet (LTE/5G) and calls, which is not always possible on older 2G/3G networks without VoLTE.
However, there are some drawbacks. The main one is the dependence on the internet connection quality. If the Wi-Fi router is overloaded (by someone downloading torrents or watching 4K video), call quality may drop sharply, and echo or lag may occur. VoWiFi requires authorization each time you connect to a new network, which can take several seconds.
Another disadvantage is the inability to use it in public places with paid or authorized Wi-Fi (cafes, airports), where you need to log in via a web page. Smartphone Samsung The app won't be able to establish a secure connection for the call until you've fully authorized your browser. Therefore, in crowded places, it's best to rely on a mobile network.
Troubleshooting and diagnostics
Despite the well-established technology, users may encounter problems when activating or using VoWiFi on SamsungOne of the most common errors is a missing menu item or an inability to enable the slider. In 90% of cases, this is due to the carrier not whitelisting your device or not updating the network profile.
If the icon appears and disappears, check your power saving settings. Aggressive power saving modes on Samsung Wi-Fi may be disabled in the background or limited, resulting in interrupted voice communications. Add your phone to the exception list or disable power saving mode during important calls.
It's also worth checking your date and time settings. A discrepancy between the time on your smartphone and the operator's servers can lead to authentication errors in the IMS network. Make sure that the settings Date and time Automatic detection is required.
adb shell settings put global ims_force_wifi_calling 1For advanced users, it's possible to force activation via USB debugging (ADB), but this requires caution. The above command can activate hidden menus, but it doesn't guarantee stable operation without operator support. Use these methods only if you understand the risks.
⚠️ Warning: Using ADB commands to change system settings may cause instability in your phone. Back up your data before attempting this.
Frequently Asked Questions (FAQ)
Do you charge for Wi-Fi calls when roaming?
Rates depend on your carrier's terms and conditions. Calls to numbers in your home country are typically charged as regular calls, even if you're abroad. However, calls to local numbers in your host country may be considered international calls. Always check roaming terms with your carrier before traveling.
Why isn't the VoWiFi icon appearing on my Samsung?
This could happen for several reasons: the service isn't connected to your carrier, your tariff plan doesn't support the technology, your phone's firmware isn't certified to work with this carrier, or you're outside the coverage area of the Wi-Fi network your profile is linked to.
Is it possible to make calls via Wi-Fi if the SIM card is blocked?
No. For work. VoWiFi An active SIM card and registration with the operator's network are required for authentication. Without a valid SIM card, the technology does not work, unlike messaging apps.
Does this feature affect internet speed?
Voice traffic takes up minimal bandwidth (approximately 64-128 kbps), so there's no noticeable decrease in page or video loading speed. However, with a very weak connection (less than 1 Mbps), issues with both speed and calls may occur.