Modern Xiaomi smartphones running MIUI or HyperOS offer a wide range of features that aren't always immediately obvious. Users often notice a phone icon with the word "Wi-Fi" in the status bar or see notifications that calls are being made over a Wi-Fi network. This comes as a surprise to many, as traditional cellular communications are becoming increasingly important, giving way to voice transmission over internet protocols.
The appearance of such a status means the activation of the technology VoWiFi (Voice over Wi-Fi), which allows you to make and receive regular voice calls using a wireless network instead of your cellular carrier's radio channel. This isn't like messaging apps like WhatsApp or Telegram, where both parties must be online; here, you call a regular number, but the signal goes through the router. Xiaomi device owners often encounter this phenomenon, even without manually changing the settings, as some carriers and firmware versions activate the feature by default to improve connection quality.
Understanding that, Xiaomi WiFi calling What it is and why it's needed will help you better manage your expenses and connection quality. In some situations, it's a lifesaver when there's no cellular network coverage, but in others, it's a source of confusion or unnecessary roaming charges. Below, we'll dive into the technical details of the process, how to manage this feature, and answer frequently asked questions from users.
VoWiFi Technology: How It Works on Xiaomi Devices
Technology Voice over Wi-Fi VoWiFi is a standard for transmitting voice traffic over IP networks. Unlike VoIP apps, which use their own servers, VoWiFi is integrated directly into the standard "Phone" module of your Android system. In this case, your Xiaomi smartphone acts as a mini base station, transmitting your encrypted voice to the telecom operator's server over any available internet connection.
The key advantage is that for both the caller and the recipient, the process appears absolutely identical to a regular call. You dial a number from your contact book, and if the icon lights up on the screen WiFi Call or a handset with a wireless network symbol, which means the connection is established through a router. This is especially true for devices Xiaomi Redmi And Poco, which are often used in areas with poor cellular coverage, such as basements or country houses with thick walls.
⚠️ Attention: Call quality directly depends on the stability of your internet connection. If the router is overloaded or the signal is weak, your voice may be interrupted, even if the network indicators show full strength.
It's important to note that this technology requires support from your mobile operator. Your operator must have gateways to receive VoWiFi traffic and enable this service for your SIM card. In Russia and the CIS, major providers have already implemented this feature, but it may not be available on older tariff plans or when using corporate SIM cards with limited functionality.
Advantages and disadvantages of the network calling feature
Transition to use Wi-Fi Calling It has its obvious advantages, which have been appreciated by Xiaomi smartphone owners living in cellular dead zones. However, there are also nuances that are worth knowing in advance to avoid unpleasant surprises, especially those related to pricing.
The main advantage is the ability to stay connected in places where conventional GSM, 3G, or 4G networks simply don't work. If you're in a building with shielding materials or in a remote location but have access to wireless internet, you'll be able to take an important call. Furthermore, HD audio quality over Wi-Fi often outperforms compressed voice quality over traditional networks.
However, there are also disadvantages. The main one is dependence on third-party infrastructure. If the internet provider is performing maintenance or there's a cable break, the connection will be completely lost, even if the cellular network is technically working, but it won't allow calls. Also, be careful with public networks that require web login, as VoWiFi may not work until you log in.
- 📶 Coating: The ability to call from basements, bunkers, and deep rooms where the tower signal doesn't reach.
- 💰 Pricing: Minutes are used from your main operator package, as with a regular call, but there may be nuances in roaming.
- 🔋 Power consumption: Smartphone Xiaomi may consume more power by constantly scanning networks and maintaining an active connection for instant login.
- 🔒 Safety: Traffic is encrypted by the operator, which is more secure than using open networks for instant messaging, but requires trust in the provider.
How to enable or disable WiFi calling on Xiaomi
Wireless voice calling on Xiaomi smartphones is controlled through system settings. The menu path may vary slightly depending on the OS version. MIUI or new HyperOS, as well as from regional firmware (Global, China, Russia).
To activate or deactivate the service, you need to go to the phone's settings menu. Typically, the path looks like this: Settings → SIM cards & mobile networks → Select your SIM card → Wi-Fi callingHere you'll see a toggle. If enabled, the phone will prioritize wireless network for voice calls when there's a good signal.
⚠️ Attention: The settings interface may change with software updates. If you don't see the "Wi-Fi Calling" option, try searching for "Wi-Fi" or "VoWiFi" in your settings.
In some cases, especially on devices not purchased from official retailers in your region, the menu may be hidden. This often occurs on Chinese firmware versions that aren't certified by local carriers. In this case, enabling the feature through the standard menu is impossible without reflashing the firmware or using the engineering menu, which is not recommended for regular users.
☑️ Checking VoWiFi settings
Pricing comparison: VoWiFi vs. regular calls
Cost is a key issue for users. Many people mistakenly believe that a Wi-Fi call is an internet call that consumes gigabytes of data. This is incorrect. VoWiFi technology transmits voice packets, but billing (time accounting) is handled by your mobile operator, not your internet provider.
Below is a table to help you understand the differences between a regular call, a Wi-Fi call, and a call via messenger.
| Parameter | Regular call (GSM/4G) | Calling via Wi-Fi (VoWiFi) | Call in Messenger |
|---|---|---|---|
| Consumption of minutes | Debited from the package | Debited from the package | They are not written off |
| Traffic consumption | Not consumed | Not consumed (or minimal) | Traffic is being consumed |
| Requirements | Cellular network signal | Internet access + operator support | Internet + Application from the interlocutor |
| Where are we calling? | To any number | To any number | Only within the app |
Roaming deserves special attention. When abroad, connecting to a local Wi-Fi network and making a VoWiFi call to a number in your home region is often charged as incoming and outgoing calls in your home region, meaning it's free (if you have unlimited minutes). However, roaming rules may change, so it's worth checking with your operator before traveling.
What happens if the router turns off while I'm talking on Wi-Fi?
Modern Xiaomi smartphones can seamlessly switch between Wi-Fi and cellular networks. If the router is turned off, the phone will attempt to transfer the call to the cellular network. If there is no cellular coverage at that location, the call will be dropped.
Troubleshooting: The icon is there, but calls don't go through.
There are situations when the icon WiFi Call The light is on, but when you try to make a call, the connection fails or the caller can't hear you. Most often, the problem lies in a DNS settings conflict or the router blocking ports required by the SIP protocol used for voice communications.
The first thing you should do is reboot your smartphone and router. This is a simple but effective step, as it resets the network settings cache. If this doesn't help, check whether "Guest Network" mode or MAC address filtering is enabled on your router, which could restrict access to the operator's servers.
The problem could also be with the SIM card itself. If the card is very old and doesn't support modern encryption standards, the operator may not authorize the device for VoWiFi. In this case, the only solution is to replace the SIM card at a mobile phone store. Also, make sure the date and time settings on your phone are correct. Xiaomi Automatic synchronization is set, since time desynchronization can lead to security certificate errors.
- 🔄 Reboot: Turn off and on your phone and router.
- 📡 Network check: Make sure other devices are working properly on this Wi-Fi network.
- 📞 SIM test: Try moving the SIM card to another phone that supports VoWiFi.
- ⚙️ Reset network settings: In the phone menu, find "Reset Wi-Fi & mobile network settings."
The Impact of Power Saving Mode on VoWiFi Operation
Battery optimization systems in Xiaomi smartphones are known for their aggressiveness. Energy saving It can forcefully disable background network activity to extend battery life. This often results in the phone "falling asleep" and being unable to accept incoming Wi-Fi calls until the screen is turned on.
To avoid missed calls, you need to add the Phone app and system services to the exceptions list. Go to Settings → Battery → Settings Make sure background activity restrictions aren't enabled for important apps. Also, in the "SIM cards & mobile networks" section, there may be a separate option called "Prefer calling over Wi-Fi" that should be enabled.
It's worth remembering that constantly searching for a network and maintaining a VoWiFi connection can increase battery consumption by 5-10% per day compared to using only cellular data. If you're at home where the cellular signal is strong, it's a good idea to disable VoWiFi to conserve battery life.
Why did the VoWiFi icon disappear after updating my phone?
After updating MIUI or HyperOS firmware, network settings may be reset to factory defaults. Furthermore, new software versions may change the list of certified operators. Please check your settings again and ensure your SIM card supports the service.
Is it possible to make calls via Wi-Fi if the cellular network is completely disabled?
Yes, you can. If you enable Airplane Mode and then activate Wi-Fi only, VoWiFi calls will work, provided your phone has registered with your carrier's network via the internet.
Does this feature work on all carriers?
No, support depends on the carrier. In Russia, major carriers (MTS, Beeline, Megafon, Tele2) support VoWiFi, but the service must be activated on the plan.