Modern smartphones Xiaomi are equipped with a powerful set of features that allow you to optimize your mobile communications. One of these technologies is Voice over Wi-Fi, or, more simply, wireless calling. This option is a lifesaver in areas with poor cellular signal but stable internet access. If you frequently experience interrupted calls in basements, summer cottages, or office buildings with thick walls, activating this mode will be a priority.
Turning on VoWiFi on devices Redmi And Poco This often happens automatically if your carrier and tariff plan support this technology. However, in some cases, manual activation is required via the engineering menu or special codes. It's important to understand that the quality of voice communication in this mode directly depends on the speed and stability of your home router or access point.
In this article, we'll cover all the ways to activate the feature, potential icon display issues, and the nuances of working with different carriers. You'll learn how to check your device's compatibility and what to do if standard methods don't work. The VoWiFi function on Xiaomi is often hidden depending on the firmware region (Global, China, EEA), so there is no universal solution for all models. We will consider solutions for different versions of the MIUI and HyperOS shell.
What is VoWiFi and why does a Xiaomi owner need it?
Technology VoWiFi Voice over Wi-Fi (Voice over Wi-Fi) allows voice calls to be made over the internet protocol, using a wireless network instead of cell towers. For the user, this means the phone behaves like a regular calling device, but the signal is routed through the router. Unlike messaging apps, it uses your regular phone number, and charges according to your mobile operator's terms and conditions, rather than using data from your internet package (although technically, it does consume data).
The main advantage is the quality of connection in "dead signal" areas. If the cellular network in your apartment shows one bar or constantly switches between 3G and 4G, the sound will be intermittent. Switching to Wi-Fi Calling This solves this problem by delivering clear HD sound. It also saves battery life, as the smartphone doesn't need to constantly strengthen its signal while searching for a cell tower.
Not all operators and not all plans support this feature by default. Before diving into your phone's settings, make sure the service is enabled with your provider. Activation often requires sending a USSD code or using your operator's account. Without this step, your phone may simply ignore attempts to switch modes.
Checking if the function is supported by your operator and tariff plan
The first step before any technical manipulation should be to check the terms of your tariff plan. The largest operators (the "big four") have already implemented support VoWiFi, but conditions may vary depending on the region where the SIM card is registered. For example, in Moscow, the function may work automatically, but in remote regions, manual activation is required.
There are several ways to check the status. The most reliable is to call customer support or check your personal account. You can also try making a test call, first turning on airplane mode and leaving only Wi-Fi. If the call goes through, the service is active. Otherwise, even enabling the setting on your phone won't work.
Please pay attention to the following nuances:
- 📱 The service must be activated specifically for your SIM card, and not just available on the network.
- 🌍 Roaming: When abroad, Wi-Fi calls may be charged as local calls, which is beneficial, but you should check the terms.
- 🔄 Profile update: Sometimes you need to update your network settings via SMS or your operator's app.
Basic setup via the standard MIUI menu
In most cases, if the operator supports the technology, the settings on the smartphone Xiaomi happens automatically. You may not even need to delve into deep settings. The standard activation path is in the MIUI shell or HyperOS It looks like this: you need to go to the SIM card settings section. Here, if supported, a "Wi-Fi Calling" toggle will appear.
If the switch is present but inactive (gray), this indicates that either the SIM card isn't recognized as supporting the feature, or the current network doesn't have coverage for registering the service. Try rebooting the device with Wi-Fi enabled. Often, after rebooting, the phone re-registers with the IMS (IP Multimedia Subsystem) network, and the icon VoWiFi appears in the status bar.
The path to the settings usually looks like this:
- Open
Settings. - Go to the section
Connections and Sharing(orSIM cards and mobile networks). - Select the required SIM card.
- Find the item
Wi-Fi callingand activate it.
In some firmware versions, this option may be called "Wi-Fi Calling." If you don't see this option in the specified location, try searching for "Wi-Fi" in the settings. If this option is missing from the menu, it means the firmware for your region isn't certified for your carrier, and more complex activation methods will be required.
☑️ Checking the basic settings
Activation via the engineering menu and codes
When the standard interface doesn't offer a power-on option, the engineering menu comes to the rescue. This is a hidden section of the system designed for hardware testing by developers. On smartphones Xiaomi You can access it using a special code in the dialer. Enter ##869434## (which corresponds to the letters ##VOWIFI##). If the code works, you will see a notification saying "VoWiFi Carrier check was disabled" or "enabled," which means the software blocking of the carrier check has been removed.
The second way is to enter the full engineering menu via code ##4636##Here you need to select a section Phone Information (Phone Information) Scroll down to the item Set Preferred Network TypeIn some cases, changing the network type (for example, to LTE only) and then back again can trigger re-registration with the network and the appearance of the VoWiFi icon. There may also be a hidden switch here. VoWiFi, which forces the function to be enabled.
⚠️ Attention: Be extremely careful when using the engineering menu. Changing radio module parameters without understanding their purpose may result in a complete loss of network connectivity (IMEI null) or unstable operation of the communication module. Record the original values before making changes.
If the code 869434 If it doesn't work (it's often blocked on newer versions of Android), you can try using shortcut apps from the Play Market that create shortcuts to hidden Android menus. Find the app "Shortcut Master" or something similar, and find the activity in the list. com.android.phone and look for items related to Vowifi or ImsService.
Comparison of VoWiFi activation methods
There are several approaches to enabling Wi-Fi calling, each with its own unique features. The method you choose depends on your phone model, Android version, and carrier. Below is a table to help you navigate the activation methods.
| Method | Complexity | Risk to the system | Efficiency |
|---|---|---|---|
| Automatic (via settings) | Low | No | High (if supported) |
| Engineering code (##869434##) | Average | Short | Average (depending on software version) |
| Testing menu (##4636##) | High | Average | High (requires precision) |
| Shortcut applications | Average | Short | Depends on the model |
The first method is the safest and preferred. If it doesn't work, proceed to codes. Using third-party apps to activate hidden features always carries a minimal risk of system instability, but it does. Keep in mind that Mi Pilot or beta firmware versions may have cut VoWiFi functionality for certain regions.
Why might the code not work?
On new versions of Android (12, 13, 14), Google and smartphone manufacturers are blocking access to engineering codes through the default dialer. In this case, the code will simply have no effect. The solution is to install a third-party dialer (such as TruePhone) with root access or use ADB commands to enable hidden flags, but this is a more advanced level.
Solution: The icon does not appear or the call is disconnected
Even after all the manipulations the icon VoWiFi may not appear in the status bar. This does not always mean the feature is not working. On many smartphones Xiaomi The icon appears only during an active call or when there is no cellular network connection (Airplane mode + Wi-Fi). If you want to see the icon all the time, this may require superuser rights (Root) and editing system files via build.prop.
A common issue is calls being dropped when leaving a Wi-Fi zone. Your phone should be able to seamlessly switch to a cellular network (VoLTE). If this doesn't happen and the call is dropped, check your switching settings. Your SIM card should be set to "Wi-Fi Preferred" or "Wi-Fi Only" (if you're constantly in an area with poor cellular coverage).
Main reasons for failures:
- 📶 Weak Wi-Fi signal: Voice communication requires a stable ping, not just high download speeds.
- 🔒 Port blocking: Some corporate or public networks block the SIP protocols required for VoWiFi.
- 📱 Outdated firmware: Operators update their lists of compatible devices, and older versions of MIUI may be excluded from the whitelist.
⚠️ Attention: Carrier interfaces and the MIUI settings menu are updated regularly. The locations of options and service names may change. Always check the latest support information for your model on the carrier's official website or in the Mi Community app.
The impact of roaming and international travel
For travelers function VoWiFi on Xiaomi This becomes critically important. While abroad, you can connect to local Wi-Fi at your hotel and call Russian numbers at your home carrier's rates, just as if you were at home. This allows you to avoid hefty roaming charges for incoming and outgoing calls. However, data roaming must be enabled in your phone's settings, even if you don't plan to use mobile data.
It's important to note that not all operators allow VoWiFi while roaming. Some block this feature at the network level. Furthermore, when making a call over Wi-Fi while roaming, the call screen may display the operator's local office number instead of your usual one, which can sometimes raise questions from the caller, but this doesn't affect your rates.
Why is there no "Wi-Fi Calling" option on my Xiaomi?
Most likely, your carrier hasn't added your device's certificate to its compatibility list, or your phone's firmware (region) doesn't match your SIM card's region. Try changing the region in your phone's settings to your carrier's country (e.g., India or Russia) and reboot.
Does VoWiFi use up my internet data?
Technically, traffic is consumed, but it's minimal (around 1 MB per minute in high quality). Mobile operators typically don't bill this traffic as regular internet if VoWiFi is active. However, if you use paid Wi-Fi at a hotel or airport, your traffic will be billed by the Wi-Fi network provider.
Is it possible to use VoWiFi without a SIM card?
No. For this technology to work, you need an active SIM card with the service from your operator. Without a SIM card, the phone will not be able to authenticate to the operator's IMS network for voice routing.
Does VoWiFi degrade internet quality on other devices?
Voice traffic has high priority but takes up very little bandwidth. The impact on video viewing or gaming on other devices on the network will be unnoticeable unless your internet connection is extremely limited (less than 1 Mbps).