Modern smartphones Huawei have powerful functionality that allows you to stay connected even in areas with poor cellular network coverage. Technology Voice over Wi-Fi (VoWiFi) is a real lifesaver for those who frequently experience connection drops in basements, thick-walled offices, or country houses. Instead of relying on a shaky base station signal, your phone uses a stable internet connection to transmit high-quality voice.
Many users mistakenly believe that internet calls require third-party apps like WhatsApp or Telegram. This is not true: the native feature allows you to make regular voice calls through a standard dialer, using a Wi-Fi router as a gateway. In this case, your carrier sees you as if you're within the coverage area of their tower, which is especially important for plans with unlimited minutes.
In this article, we will examine in detail the process of activating this option on devices with the shell EMUI And HarmonyOSWe'll cover not only the standard activation methods but also hidden settings, and answer questions about compatibility with various carriers. Having your equipment and SIM card ready is the first step to a stable connection without static or echo.
Checking the compatibility of equipment and operator
Before you delve into the menu settings, you need to make sure that your smartphone Technically capable of supporting VoWiFi technology. Not all models, even those released in recent years, have unlocked functionality for all regions. Furthermore, it's critical that your carrier supports this service, as activation will be impossible without their permission on the network side.
Usually flagship series Huawei P And Huawei Mate, as well as many models in the line Nova, fully support modern communication standards. However, if you purchased a device intended for the Chinese market, or a more budget-friendly model of the series Y, functionality may be limited by software. Checking the specifications on the official website or in the device documentation is a must.
⚠️ Note: Even if the option appears in the phone menu but isn't activated, the issue may be due to a lack of service on your carrier's end. Contact support or check your account to ensure your plan allows VoWiFi.
It's also worth keeping in mind that for this feature to work correctly, your SIM card must be registered to a 4G (LTE) network. If you're using a very old SIM card, issued during the 2G/3G era, replacing it at a mobile phone store may be mandatory. Modern voice traffic encryption standards require up-to-date security profiles, which only newer cards have.
Basic activation of the feature in Android settings
The standard way to enable wireless calling on the shell EMUI It's fairly simple, but requires attention to interface details. Users often look for this option in the Wi-Fi section, whereas logically it belongs under mobile network settings. The system integrates these protocols to ensure seamless switching between networks.
To get started, open the main settings menu and find the section Mobile networkThis is where the main SIM card settings are located. If you have two SIM cards installed in your device, you must select the one for which you want to activate the feature, as the settings are applied individually to each slot.
- 📱 Go to the menu
Settingsand select the itemMobile network. - 📞 Click on the name of your operator or
SIM card 1(or 2). - 🌐 Find the switch Wi-Fi calling and activate it.
- ✅ Accept the user agreement if the system asks for confirmation.
Once enabled, a special icon indicating VoWiFi mode may appear in the status bar next to the signal strength indicator. Its appearance depends on the phone model and operating system version: it may be a handset with a Wi-Fi symbol or simply the word "VoWiFi." Wi-Fi CallIf the icon appears, the connection has been established successfully.
☑️ Pre-activation check
Using the engineering menu for hidden options
In some cases, the standard switch may be missing from the menu, despite the phone supporting the technology. This often happens on devices imported from other regions or when using custom firmware. In such situations, the engineering menu—a hidden diagnostic section accessed via a special code—comes to the rescue.
To access this section, open the Phone app (dialer) and enter the combination ##2846579##After entering the last digit, the menu should open automatically. Navigation is via the touchscreen, but be extremely careful: changing unfamiliar settings may disrupt the radio module.
In the menu that opens, follow the path: ProjectMenu → Network Setting → VowifiHere you will see settings related to Voice over Wi-Fi. If you see the item Vowifi Switch or similar, try to put it into a state EnableAfter this, reboot your device and check if the standard switch appears in the main settings.
What to do if the code doesn't work?
Some carriers or firmware versions block access to the engineering menu via the standard dialer. In this case, you can try installing the Google dialer app (Google Phone) from a third-party source and entering the code through it, or use ADB commands to emulate the input.
It's important to understand that the engineering menu is a developer tool. If your phone starts losing network connection or battery life after changing settings, reset all settings to their default values. Inexperienced tinkering with the radio system can lead to connection instability.
Setting priorities and operating modes
After successfully activating the feature, the user is faced with the question of priorities. The smartphone must know which network to use first when both cellular and wireless are available. Incorrect settings can result in the phone either "clinging" to a weak Wi-Fi connection, degrading connection quality, or, conversely, ignoring it.
VoWiFi settings typically offer two main modes: "Prefer Wi-Fi" and "Prefer Mobile Network." The first option is ideal for areas with poor cellular signal but stable internet. The second option is useful if you want to save roaming data or if your Wi-Fi router is overloaded with other devices.
| Parameter | Prefer Wi-Fi mode | Prefer Mobile mode | Wi-Fi Only Mode |
|---|---|---|---|
| Behavior in the coverage area | Uses Wi-Fi for calls | Uses LTE/3G for calls | Works only via Wi-Fi |
| Mobile traffic consumption | Minimum | Standard | Absent |
| Quality in the basement | High (if there is Wi-Fi) | Low (if no LTE) | High (if there is Wi-Fi) |
| Battery | More economical with weak LTE | Standard consumption | Maximum savings |
There's also a "Wi-Fi Only" option, which completely disables voice calls over the cellular network. This is useful when you're abroad and want to avoid accidentally connecting to local carriers by using only the internet for calls. However, keep in mind that in this case, leaving a Wi-Fi zone will make you unavailable for regular calls.
Troubleshooting call quality and echo issues
Even with proper setup, users may experience audio artifacts, such as echo, metallic voice quality, or delays. Most often, the cause lies not with the phone itself, but with the home router configuration or channel congestion. QoS (Quality of Service) in the router plays a key role here.
Go to your router settings (usually at 192.168.0.1 or 192.168.1.1) and find the QoS section. Make sure voice call traffic is prioritized. If your router supports traffic type prioritization (VoIP), enable this feature. This will reserve some bandwidth for voice calls, even if other devices are downloading movies.
⚠️ Note: Router and mobile operator interfaces are constantly being updated. The location of QoS or VoWiFi menu items may differ from those described. Always consult the official documentation for your specific equipment.
Another possible cause of problems may be the use of VPN services. Since VoWiFi requires a direct connection to the operator's gateways, tunneling traffic through third-party servers often blocks call establishment. When making calls over Wi-Fi, it's recommended to temporarily disable the VPN or add exceptions for operator domains.
The Impact of Power Saving on VoWiFi Performance
Battery optimization systems in Huawei are known for their aggressiveness. They can forcibly close background processes necessary for maintaining a VoWiFi network connection, especially when the phone's screen is off. This can result in incoming calls not being connected or being significantly delayed.
To avoid this, you need to add the Phone app and system services to the power saving exceptions list. Go to Settings → Battery → Launching applicationsFind the system app responsible for calls in the list and manually allow it to auto-start, run in the background, and launch again.
- 🔋 Turn off Ultra Saving mode when you're waiting for important calls.
- 📱 Allow background activity for system communication services.
- 🚫 Avoid using third-party memory cleaners, which can disrupt the network registration process.
If the dropped calls issue persists even after setting exceptions, try resetting your network settings. This will reset all mobile and Wi-Fi settings to factory defaults, clearing any software conflicts that may have accumulated over time.
Why does the VoWiFi icon disappear when there is an incoming call?
This may be due to a temporary switch to LTE to ensure connection stability if the Wi-Fi signal momentarily weakens. It may also be due to data roaming settings: some carriers require mobile data to be enabled even for Wi-Fi calls to complete authentication.
Will VoWiFi work if there is no mobile network coverage at all (0 bars)?
Yes, this is the primary use case for this technology. If the phone is registered with the carrier's network (even if the signal is too weak for a voice call but sufficient for SMS registration) and is connected to Wi-Fi, the call will go through. In some cases, the phone may display "Emergency Calls Only," but VoWiFi will still work.
Do carriers charge extra for Wi-Fi calls?
In most cases, this service is free and is charged according to your basic plan (package minutes). However, if you're roaming internationally, the rules may differ: a Wi-Fi call may be counted as an incoming/outgoing call from your home network, which is a significant advantage over roaming rates. Always check with your carrier for details.