What is WiFi calling on a Samsung Galaxy and how to set it up?

Modern smartphones Samsung Galaxy While mobile phones have become universal communication hubs, voice quality still depends directly on cellular network coverage. Often, in offices with thick walls or country houses, the 4G/LTE signal is unstable, leading to dropped calls at the most crucial moment. Technology is the solution to this problem. VoWiFi, which allows you to make calls over a wireless network.

This feature has been available in the Korean giant's flagship and budget models for several years, but many users still aren't aware of its existence or don't know how to activate it correctly. The principle is simple: the phone reroutes voice traffic over the internet, bypassing standard cell towers. This not only improves audio quality but also often saves battery life, as the device doesn't have to constantly search for a lost base station signal.

In this detailed guide, we will cover all aspects of how the technology works on devices. One UIYou'll learn how to check if your carrier supports this feature, where to find hidden settings in the menu, and what to do if the activation option disappears after a system update. Understanding these nuances will ensure you never run out of service in areas with poor reception.

VoWiFi Technology: How It Works in Practice

Technology Voice over Wi-Fi (VoWiFi) is a standard for transmitting voice traffic over IP. Unlike popular messaging apps, which use their own servers and require the other person to install the app, Wi-Fi calls operate at the carrier level. This means you dial a regular number in the standard Phone app, and the system automatically decides whether to route the call over the cellular network or the internet.

The key advantage is the transparency of the process for the user. You don't need to notify the other person that you're calling over the internet or ask them to connect to Wi-Fi. To them, it will appear like a regular incoming call. The main difference from VoIP applications is that you can even call landline numbers and phones of people who do not have internet access.

Sound quality in mode HD Voice WiFi often outperforms standard cellular service, especially if your router supports modern standards. 802.11ac or axHowever, connection stability depends entirely on the speed of your home provider and the load on your local network.

It is worth noting that when switching between networks (for example, you leave the house), modern smartphones Samsung can transfer calls from WiFi to LTE without interrupting the connection if the operator supports the function eSRVCCThis makes the technology a truly reliable alternative to traditional communications.

Checking operator and tariff compatibility

Before you look for settings on your phone, you need to make sure that your mobile operator provides the service. VoWiFiIn Russia and the CIS, this feature is supported by most major market players, but it must be activated on your SIM card. The service is often enabled by default, but in some cases, you may need to send a USSD request or change settings in your personal account.

It's important to understand that support for this technology depends not only on the operator but also on the specific tariff plan. Some archived tariffs may not have access to the IP traffic packages required for voice calls. The service may also be unavailable if you're roaming, although many operators recommend using Wi-Fi abroad to save money.

⚠️ Attention: Service terms are subject to change. Operators reserve the right to change the list of supported devices or plans. Always check the latest information in your operator's official app or on the website's support section.

Activating the service often requires sending a short command or using a mobile operator app. Below is a table of the main operators and verification methods.

After activating the service on the operator's side, it is recommended to reboot the smartphone. Samsung GalaxyThis is necessary for the device to re-register with the network and receive the updated settings profile. Without a reboot, the menu item may not appear.

Step-by-step instructions: enabling the feature on a Samsung Galaxy

On smartphones Samsung with shell One UI Wi-Fi call management is now located in a separate menu, but the path to it may vary slightly depending on your Android version. Most often, the setting is located in the Cellular Connections section. If you can't find it, search for it in Settings.

Here is the standard algorithm of actions for activation:

• 📱 Open Settings your device and go to the section Connections.
• 📶 Find the item Wi-Fi calling (sometimes it is hidden inside the menu Mobile network or SIM manager).
• 🔘 Toggle the switch to the on position. The system may ask you to confirm your emergency number.
• ✅ Make sure that the corresponding icon (usually a telephone handset with a WiFi symbol) appears in the status bar.

On some models, especially in versions for certain regions, the path may look different: Settings → Apps → Phone → Three dots (menu) → Settings → Wi-Fi CallingIf you use two SIM cards, you will need to configure the settings for each one separately by selecting the desired SIM card in the menu. SIM Card Manager.

After turning it on, it is recommended to make a test call. Pay attention to the icon at the top of the screen: if it appears there Wi-Fi Call or a similar indicator next to the signal level, which means the technology is working correctly.

Hidden menus and engineering codes for diagnostics

If you can't enable the function using standard methods, you can try using the engineering menu SamsungThis is a hidden section designed for hardware testing and network diagnostics. Be careful when changing settings in this menu, as incorrect actions may result in unstable modem operation.

To enter the diagnostics menu, enter the code in the Phone application #0011# or #2263#In the ServiceMode menu that opens, you need to find the section related to Band Selection or IMS StatusHere you can see whether the device is registered with the IMS (IP Multimedia Subsystem) network, which is required for VoWiFi to work.

⚠️ Attention: Changing parameters in the engineering menu (Service Mode) may result in signal loss or the need to reset network settings. Only change settings you are confident in, or simply use this mode to view the IMS registration status.

There is also a code ##4636##, which opens the Android testing menu. Go to Phone information and find the item Run a Ping test or Toggle radio checkYou can see the status here. VoWiFi provisionedIf there is a value False, which means the phone has not received a profile from the operator.

For more in-depth diagnostics, you can use the application Samsung Members. In the section Diagnostics → Mobile network The system will check the antenna status and network registration, which will help determine whether the problem lies in the hardware or software.

What to do if the engineering menu is empty?

If nothing happens when you enter the code or the menu is blank, your firmware version may be blocking access to these features. This often happens on devices not purchased from authorized dealers (versions for other countries). In this case, the only solution is to flash the firmware to the regional version (CSC) for your carrier.

Why Wi-Fi Calls Drop: Main Reasons

It's quite common for a feature to work and then disappear. This most often occurs after an operating system update. Android or operator profile updates. The system may have reset the network settings to default, disabling advanced features.

The second common cause is router issues. Some routers use specific NAT settings or block certain ports required for SIP traffic. If the phone is connected to a guest WiFi network or a public hotspot with browser authentication, calls won't work, as a direct connection is required without intermediary login pages.

It's also worth checking the power saving mode. Aggressive battery saving settings in Samsung Galaxy may disable the WiFi module or limit background activity of the Phone app, which leads to connection interruptions or the inability to make incoming calls.

• 🔋 Check if the "Maximum energy saving" mode is enabled.
• 📡 Make sure that Client Isolation is not enabled on your router.
• 🔄 Try resetting your network settings: Settings → General → Reset → Reset network settings.
• 📞 Make sure your SIM card isn't too old and supports 4G/LTE standards.

Impact of roaming and international calls

Usage VoWiFi Roaming is one of the most effective ways to save on calls abroad. When you're abroad but connected to Wi-Fi, calls to numbers in your home region are often charged as regular local calls or at your home plan, without any international roaming surcharges.

However, there are important nuances here. Some operators interpret your IP address as being in another country and may block the service or charge different rates. Furthermore, international rates may apply when calling numbers in your home country (where you're physically located).

This helps you understand which network your connection is using. Always check pricing with your carrier before traveling.

Technically, when roaming, your phone can attempt to register with your partner's local network. If the signal is weak and your Wi-Fi is strong, the phone will switch to VoWiFi. However, if you leave the Wi-Fi zone, the call may be dropped, as international roaming between different operators (handover) is unstable.

Quality Comparison: VoWiFi vs. Regular Calls

Users often debate which is better: traditional cellular service or internet calls. In terms of audio clarity, VoWiFi often wins, offering a wide frequency range (Wideband Audio). Voices sound more natural, and the metallic tones typical of compression in older 2G/3G networks are eliminated.

However, there's a downside. The cellular network prioritizes voice traffic, ensuring stability even when the tower is under load. The WiFi channel is shared: if someone on your network starts downloading a large file or watching a 4K video, call quality may drop sharply, with echo or a robotic voice appearing.

Below is a comparison of key features:

So, the ideal strategy is to use a hybrid mode. Rely on it indoors with good Wi-Fi, and trust the cellular network outdoors. Smartphones Samsung smart enough to switch between these modes automatically if configured Wi-Fi Preferred activated correctly.

Frequently Asked Questions (FAQ)

Does making calls over WiFi use up internet traffic?

Technically, data usage is used, but operators typically don't charge for it if the call is made to numbers in your region. This data usage goes through a secure tunnel and isn't counted toward your overall data plan. However, if you call a number in another country while abroad, international roaming rates may apply.

Will VoWiFi work if the router is distributing WiFi from the phone (modem mode)?

No, in most cases, this connection doesn't work. Carriers block such connections because they see you're using your mobile data to create a tunnel back to their own network. Furthermore, this creates a loop and doubles your battery life.

What should I do if the WiFi Call icon is on but calls are not going through?

The problem is most likely with DNS or ports blocked by the router. Try changing the DNS in your phone's WiFi settings to a public DNS (for example, Google's). 8.8.8.8). Also, check if your router has parental controls that could block voice traffic.

Can I use VoWiFi if my SIM card does not support 4G?

For VoWiFi to work, your SIM card must support IMS profiles. Older SIM cards (issued 10 years or more ago) may not have the necessary files. In this case, you'll need to replace your SIM card with a new one at a carrier store, keeping your phone number.

Does WiFi calling affect internet speed?

Voice traffic takes up very little bandwidth (usually up to 100 kbps). For modern connections, this is unnoticeable. However, if your internet connection is very limited (less than 1 Mbps), downloading files and talking simultaneously may result in degraded audio quality.