Modern Samsung Galaxy smartphones offer a wide range of features that allow users to stay connected even in poor cellular coverage. One of the key technologies that ensures stable voice communication in such situations is VoWiFi (Voice over Wi-Fi). This feature allows you to make and receive calls using a wireless internet connection instead of a base station's radio signal.
Activating this option is especially important for residents of apartment buildings with thick walls, basements, or remote suburban areas where GSM signal strength is minimal. However, the activation process may vary depending on the operating system version. Android and shells One UIIn this article, we'll walk you through every setup step in detail so you can communicate seamlessly from anywhere in the world.
It's worth noting that for the technology to work correctly, several conditions must be met by your mobile operator and internet service provider. Without support at the tariff level, activating the feature in the phone menu will not produce the desired result. Therefore, the first step should always be to check the service availability with your service provider.
Preparing your smartphone and SIM card for use
Before diving into the interface settings, you need to ensure your device is technically ready to work with advanced voice protocols. Most modern Samsung models, starting with the Galaxy S7 series and newer, as well as the current A and M series, support this feature out of the box. However, the software must be updated to the latest available version.
The second critical component is the SIM card itself. If you're using a SIM card manufactured more than 5-7 years ago, it may not support the necessary encryption and data transfer standards for VoWiFi. In this case, you'll need to replace the SIM card at a carrier store, which is usually free and takes minimal time.
Also, make sure your phone has 4G (LTE) enabled. Even if you plan to make calls via Wi-Fi, the protocol often requires registering with an LTE network for initial authentication and signal transmission. Check the connection status in the top status bar: the icon should be displayed there. 4G or LTE.
⚠️ Important: Make sure your tariff plan doesn't block voice traffic over the internet. Some archived tariffs may require additional service from your carrier.
Finally, check for a stable internet connection. It's best to test on your home Wi-Fi network, where you're confident it's fast and free of restrictions. If your router is configured to filter MAC addresses or has strict firewall rules, calls may not be able to connect.
Activating the function in the standard settings menu
The most common and easiest way to enable VoWiFi technology on Samsung smartphones is through the standard settings menu. The shell interface One UI It's quite logical, but the switch layout may vary slightly on different Android versions. Let's look at a universal sequence of actions that works for most current models.
To start, open the Phone app, which is where you usually make calls. We need to access the advanced call management menu. Tap the three vertical dots in the upper right corner of the screen to open the drop-down menu and select "Settings." This is where you'll find the key voice communication settings.
In the list that opens, look for a section that may be called "Wi-Fi Calling" or "Wi-Fi Calling." If you don't see this option right away, go to the general device settings via the gear icon in the notification shade. In the settings search (at the top of the screen), type "Wi-Fi Calling"—the system will automatically redirect you to the correct section.
Once you've found the switch, turn it on. The system may ask you to confirm your action, warning you that data transfer charges may apply according to your provider's rates. If you're connected to your home internet, this typically doesn't incur any additional charges.
☑️ Activation checklist
Once turned on, a special icon should appear at the top of the screen, next to the signal strength indicator. This is usually an image of a handset with Wi-Fi symbols or the text VoWiFiThis signals that the phone is ready to route voice traffic over the wireless network.
Configuration via the engineering menu and hidden codes
In some cases, especially on devices purchased from foreign suppliers or with custom firmware, the standard switch may be missing. Hidden service codes, which allow access to the engineering menu, come to the rescue. Using this method requires greater caution, as changing incorrect parameters can affect the operation of the communication module.
To enter the Samsung service menu, use the code ##4636## or region-specific code #27663368378#Enter the combination in the Phone app as you would a regular number. If the code is compatible with your software version, a testing menu will open.
In the interface that opens, select "Phone Information." Scroll down until you find the checkbox labeled "VoWiFi Call Provisioned" or "IMS Voice over Wi-Fi." Check this box. The changes are applied instantly, without requiring a reboot.
#27663368378#
(Enter in phone app)
There's also an activation method via the CSC (Country Specific Code) menu, which changes the device's regional settings. This allows you to "trick" the phone into thinking it's in a country where carriers support VoWiFi by default. However, this method is complex and requires specialized software like SamFw Tool on PC.
⚠️ Warning: Changing settings in the engineering menu or changing the region (CSC) may void your warranty or disable Samsung Pay and Health features. Only proceed if you are confident in your skills.
What to do if the code doesn't work?
If nothing happens when you enter the code or an error message appears, it means your firmware version or processor model doesn't support direct access to this menu. In this case, try using third-party apps to activate hidden features or contact an authorized dealer to update your firmware to the regional version.
Configuration features for different operators
Successful VoWiFi activation directly depends on your mobile operator's policies. In Russia and the CIS, major market players support this technology, but conditions may vary. For example, some operators require mandatory registration on an LTE network before switching to Wi-Fi.
For subscribers Megaphone And MTS The service is often activated automatically the first time you connect a compatible device. However, you may be required to confirm your consent to use the technology in your personal account. Check the "Services" section in your operator's app.
Operator Beeline And Tele2 VoWiFi also supports VoIP, but this feature may be administratively blocked on some tablet plans or corporate SIM cards. If you use corporate communications, please contact your company's IT department.
| Operator | Support status | Necessary conditions | Tariffs |
|---|---|---|---|
| MTS | Supported | 4G, profile update | At the rate per minute |
| Megaphone | Supported | Active Wi-Fi Calls service | At the rate per minute |
| Beeline | Supported | Setting up an APN (rare) | At the rate per minute |
| Tele2 | Supported | Software version no lower than Android 9 | At the rate per minute |
It's important to understand that even with carrier support, Wi-Fi calls may be charged as incoming and outgoing calls from your home network when roaming, allowing you to save on roaming charges. However, always check international roaming terms before traveling.
Solved connection problems and errors
Despite proper setup, users may encounter a situation where the VoWiFi icon doesn't appear or calls are dropped. One of the most common causes is a conflict between network modes. Try switching the network mode in settings (Settings → Connections → Mobile networks → Network mode) from “5G/LTE/3G/2G” to “LTE/3G/2G only” and back.
Another problem is the aggressive energy saving system. Android It may disable background phone processes to save battery life, which interrupts the connection to the IMS server. Go to Battery settings, find the "Phone" app, then "Google Play Services," and select "Do not limit" or "Optimize."
If you're using a dual-SIM smartphone, make sure VoWiFi is enabled for the SIM card you plan to use for calls. Settings may vary for each SIM card. Switch to the appropriate card in the SIM card management menu and check the status there.
In rare cases, a full network settings reset can help. This won't delete your personal data (photos, contacts), but it will return Wi-Fi, Bluetooth, and mobile network settings to factory defaults. Here's how to reset: Settings → General Settings → Reset → Reset Network Settings.
Advantages and limitations of VoWiFi technology
Using Wi-Fi calling offers a number of undeniable advantages, the most important of which is the connection quality in "dead zones." You can take important calls even in the deep basement of a shopping mall or in a metal-frame building where a regular signal doesn't reach.
Furthermore, the technology provides higher sound quality (HD Voice), as the Wi-Fi channel often has greater bandwidth than a congested base station during peak hours. Switching between Wi-Fi and the cellular network during a call is virtually seamless if LTE coverage is sufficiently dense.
However, there are limitations. Call quality directly depends on the quality of your internet connection. If someone in the next room starts downloading large files or watching 4K videos, your conversation may be interrupted or their voice may sound robotic.
It's also worth keeping in mind that emergency services (112, 102) may not locate you with the same accuracy as a cell tower, as the Wi-Fi network's IP address may be registered in a different area of the city. When calling emergency services, the system may automatically switch you to the cellular network.
Why does the VoWiFi icon disappear when there is an incoming call?
This could be due to an unstable connection or because your carrier doesn't support seamless handover in your specific location. Also, check if your phone has "Do Not Disturb" enabled, which could conflict with the IMS protocol.
Is internet traffic used during a call?
Technically, traffic is consumed, but operators typically don't bill it as part of their internet plans. A minute of VoWiFi calls uses approximately 0.5–1 MB of data, but this isn't typically deducted from your basic gigabyte package.
Is it possible to make calls via Wi-Fi while roaming abroad?
Yes, this is a great way to save money. If you're abroad and connected to a hotel's Wi-Fi, incoming and outgoing calls will be charged as in your home region (or according to your plan), rather than expensive international roaming charges. Just remember to turn on "Flight Mode" and leave Wi-Fi on only, so your phone doesn't register with a foreign network.
Does VoWiFi work if there is no cellular network at all?
Yes, this is the primary purpose of this technology. Your phone may not have any network coverage at all (the "No Service" icon appears), but if you have Wi-Fi and the feature is enabled, calls will still be received. In this case, only the Wi-Fi calling icon may be lit in the status bar.
How do I disable a feature if it's interfering?
Just go back to Settings → Connections → Wi-Fi Calling and toggle the switch to the "Off" position. You can also select "Roaming only" or "Prefer mobile network" if this setting is available in your menu.