How to Enable Wi-Fi Calling on Xiaomi: A Step-by-Step Guide

Many smartphone owners face situations where the mobile network indoors is unstable, dropping out at the signal's threshold. In such cases, technology becomes a lifesaver. Wi-Fi Calling, allowing you to make voice calls and send SMS messages over an internet connection. This is especially relevant for users Xiaomi, whose devices often come with global or European firmware, where functionality may be hidden or require additional activation.

Activating this option doesn't require installing third-party apps like Skype or Viber, as it uses a standard phone number and the system's native dialer. Call quality often surpasses standard GSM, especially in densely populated areas or behind thick walls where the operator's radio waves simply can't penetrate. However, the activation process isn't always intuitive and depends on the specific device model and operating system version.

In this article, we'll detail the steps for different versions of MIUI and HyperOS, as well as explore the nuances of setting up different mobile operators. You'll learn how to bypass provider restrictions if automatic activation doesn't work, and what hidden codes you might need to access the engineering menu. Proper setup will ensure a stable connection where your phone previously showed "No Network."

What is VoWiFi and why do Xiaomi owners need it?

Technology Voice over Wi-Fi (VoWiFi) is the transmission of voice traffic over IP protocols, similar to how data is transmitted when browsing websites. For the user, this means the smartphone uses the router's Wi-Fi access point instead of the cellular operator's base station to establish a connection. This is critical in basements, offices with shielded walls, or remote country houses where the LTE/4G signal strength is insufficient for a stable conversation.

Usage Xiaomi When used in conjunction with this technology, it offers a number of advantages, the most important of which is battery conservation. Searching for a network in weak signal conditions forces the phone's modem to work at its maximum capacity, which quickly drains the battery. Switching to Wi-Fi reduces the load on the radio module, allowing the device to operate longer. Furthermore, these calls are billed according to your primary data plan, not as data traffic, unless your carrier sets other rules.

It's worth noting that this feature requires carrier support. Even if your phone is technically ready, you won't be able to activate it without the appropriate service on your SIM card. Modern models Redmi And Poco support this function out of the box, but in the budget segment or older models, additional manipulation of system files or hidden menus may be required.

⚠️ Note: When using VoWiFi, your location may be less accurate for emergency services, as it is based on the registered Wi-Fi address of the router, not the geolocation of the cell tower. Make sure the address is up-to-date in the settings.

It's important to understand the difference between regular calls via messaging apps and native Wi-Fi Calling. In the former, the other person sees your internet account, while in the latter, they see your real phone number, and the connection is established instantly, just like a regular call. The system automatically switches you between Wi-Fi and mobile networks without interrupting the connection, ensuring seamless communication.

Checking carrier and phone model compatibility

The first step before setting up the service is to verify that your mobile operator supports it. Major Russian providers have already implemented this technology, but the terms and conditions may vary. For example, one operator may offer the service free and automatically, while another may require an application or a specific plan.

You also need to make sure that your model Xiaomi Certified for use on a specific operator's network. It often happens that devices imported through parallel channels or intended for the Chinese market (CN Version) have a limited list of supported operators in the firmware. In such cases, the standard switch may be missing from the menu, requiring the use of special codes or third-party utilities to activate it.

Below is a table showing the technology's support status with major operators and the steps required for activation. This information is subject to change, so it's always a good idea to check with official sources.

If your carrier claims support, but your phone doesn't see the service, the problem may be in the firmware version. Global versions (Global ROM) usually have a wider list of operator profiles than Chinese (China ROMIn some cases, flashing the device to the region corresponding to your country of residence helps, but this is a complex procedure that requires unlocking the bootloader.

Standard activation via MIUI and HyperOS settings

In most current versions of the shell from Xiaomi The feature is integrated directly into the phone's settings menu. The activation process is fairly simple, but the path to the required switch may vary depending on the Android version and interface. Typically, all the necessary settings are located in the section responsible for SIM cards and mobile networks.

To get started, open the default Settings app and find "SIM cards & mobile networks." Here, you'll need to select the specific SIM card if you have two installed, as the settings apply individually to each slot. Look for a section labeled "Wi-Fi Calling." If this option is present, simply toggle the switch to the on position.

In some cases, the system may ask for confirmation or prompt you to download your operator profile. Agree to the terms and conditions and wait for the network registration process to complete. Upon successful activation, a corresponding icon, often labeled as Wi-Fi with a telephone receiver or abbreviation VoWiFi.

If the standard search doesn't work, try using the settings search. Enter "Wi-Fi" or "VoWiFi" in the search bar. The system will automatically highlight the desired menu item, even if it's hidden deep within a submenu. This is especially true for newer versions. HyperOS, where the structure of the settings has been significantly reworked.

Sometimes it can be useful to reset network settings if the switch is present but not working. Go to Settings → Connection and sharing → Reset Wi-Fi, mobile networks, and BluetoothPlease note that this action will delete saved Wi-Fi network passwords and Bluetooth device pairings, but may fix a software glitch that is blocking voice calls.

Using the engineering menu and hidden codes

When the default settings don't offer the option to enable VoWiFi, hidden engineering diagnostics menus come to the rescue. Xiaomi They are often accessed through special codes entered in the Phone app. One of the most useful codes is ##86583##, which forces the operator verification to be enabled or disabled for the VoLTE and VoWiFi feature.

You may not see any visual confirmation on the screen when entering this code, but the system will silently grant permission to activate the feature regardless of your carrier profile. After entering the code, return to the default settings and check if the toggle appears. If it was already there but inactive, this code should unlock it.

Another powerful tool is the CIT (Customer Integration Test) menu. To access it, type ##6484##In the list of tests that opens, find the section related to telephony or the SIM card. Here you can check the network registration status and see if the modem technically detects VoWiFi service availability. This will help you determine whether the issue is software-related or the radio module-related.

What to do if the codes don't work?

If you enter the code ##86583## If this doesn't work, your firmware version may block access to these commands. In this case, install a third-party app to manage hidden settings, such as Hidden Settings for MIUI, available in the Play Market. It allows you to activate many hidden features without root access.

Use caution when using engineering menus. Changing unknown parameters may result in unstable radio module operation or complete loss of network connectivity. Code ##86583## is a safe operator permission switch and does not interfere with the system operation. Do not change values ​​in other CIT sections unless you are sure of their purpose.

Setting up the service through operator applications

Often the problem isn't with the phone, but rather that the service itself isn't activated on the carrier's side. Even if there is support XiaomiWithout permission, nothing will work on the SIM card's network. Most major providers allow you to manage this feature through their official apps or personal accounts on their website.

For example, with MegaFon, you need to open the app, go to the services section, and find "Internet Calls." With MTS, a similar option might be called "Wi-Fi Calls." After enabling it in the app, put your phone in airplane mode for 10-15 seconds, then return it to normal mode to re-register with the network.

If the app doesn't offer this option, try sending a special USSD request. The commands vary by operator, so it's best to check them on the official website or with customer support. Sometimes you need to send an SMS with a specific text to a short code to activate your profile.

⚠️ Note: After activating the service, it may take up to 24 hours for changes to take effect on your carrier's end. If the icon doesn't appear in the app immediately after activation, please wait a while or restart your device.

In some cases, carriers require the latest configuration profile to be installed on your device. Check your phone's settings for the "Carrier Profile Update" section (if available in your Android version) or simply update your system to the latest available version, as new security patches often contain up-to-date APN lists and VoWiFi settings.

Troubleshooting and missing VoWiFi icon

One of the most common issues is when all the settings are correct and the service is connected, but the icon doesn't appear in the status bar. First, make sure you're in a strong Wi-Fi area. If the router's signal is weak, your phone may automatically switch to the mobile network to ensure a strong connection, and the VoWiFi indicator will disappear.

Also, check that "Data Saver" or "Metered Connection" mode isn't enabled. The system may block voice packet transmission over Wi-Fi, considering it a data drain. Go to Wi-Fi settings, select your network, and ensure "Treat this network as unlimited" or a similar option is checked.

If you're using a dual-SIM phone, remember that VoWiFi only works for the SIM card that's selected for voice calls by default, or requires individual settings for each. Switch call priority to the desired SIM card in the menu. Settings → SIM cards and mobile networks → Calls.

In rare cases, the problem may be with your router. Some home internet providers block the ports required for SIP protocols used in VoWiFi. Try temporarily sharing the Wi-Fi connection from another device (for example, another phone) and see if the icon appears. If so, the problem lies with the settings of your main router or home internet provider.

Frequently Asked Questions (FAQ)

Does VoWiFi reduce sound quality compared to regular communication?

Typically, the sound quality when using VoWiFi is even better than with a standard GSM connection, thanks to the HD Voice codec. However, this directly depends on your internet speed and the Wi-Fi channel load. With a stable connection, the difference will be noticeable.

Will minutes be deducted if I call via Wi-Fi?

Yes, Wi-Fi calls are charged like regular voice calls according to your plan. They use up your minutes, not your data plan (although technically, data is used; carriers don't charge for it separately). If you have unlimited minutes, your Wi-Fi calls will also be unlimited.

Is it possible to use VoWiFi while roaming?

This depends on your carrier's terms and conditions. Some allow Wi-Fi calling abroad at your home network's rates, which is very advantageous. Others may block this feature while roaming or charge different rates. Be sure to check this before your trip.

Why does the function turn off by itself after some time?

This could be due to a carrier configuration update or temporary issues on the provider's end. The phone may also disable VoWiFi if it detects an unstable Wi-Fi connection. Try restarting the device and rechecking the settings.

Does Wi-Fi Calling work if there is no mobile network at all?

Yes, that's the primary purpose of the technology. If you're in a bunker or a location without a cell tower signal but have Wi-Fi, you'll be able to make and receive calls and text messages as usual, provided the service is activated.