Modern smartphones, such as the popular Xiaomi Redmi Note series, often fall victim to poor cellular coverage inside buildings. Concrete walls, remoteness from towers, or terrain features can make communication intermittent and annoying. In such situations, VoWiFi (Voice over Wi-Fi) technology, which allows voice calls and SMS over the Internet connection, ignores the weak signal of the base station, comes to the rescue.
Activating this feature on devices with a MIUI shell or the new HyperOS can significantly improve the quality of communication in offices, basements and country houses. However, despite the availability of technical capabilities in most modern devices, operators and manufacturers often hide this option by default.
In this detailed guide, we’ll look at all the known ways to enable Wi-Fi calls on Xiaomi smartphones.We’ll break down standard settings, hidden engineering menus, and specific codes that work for different regions and firmware versions. Follow the instructions carefully so that your Redmi Note stays connected at all times.
What is VoWiFi Technology and Why is it Needed?
Voice over Wi-Fi is a standard for voice traffic over the Internet protocol. Unlike traditional applications like WhatsApp or Telegram, which use their own servers, VoWiFi is integrated directly into the phone's system call, which means that the call goes to a regular phone number, is displayed in a standard call history and is charged according to your main carrier plan, rather than consuming Internet packet traffic.
The main advantage of this feature is the stability of the connection where the cellular network can not cope. If you have a single network division at home, but you have stable home Wi-Fi, the sound quality will be crystal clear, this is especially true for owners of Xiaomi smartphones, which are often used as a main working tool.
Also, using Wi-Fi to make calls saves battery life. Finding a lost cellular signal is one of the most energy-intensive processes for any mobile device. By switching to stable Wi-Fi, you reduce the model load and extend the battery life of your Redmi Note.
⚠️ Note: To work with this feature, your mobile operator must support VoWiFi technology, and your mobile operator must support VoWiFi. SIM-The card must be registered in the home region, and when roaming abroad, the conditions may differ.
It is important to understand that the quality of the connection depends on the speed and stability of your Internet connection. If the router is overloaded or the Wi-Fi signal is weak, the quality of the call may deteriorate, despite the absence of problems with the operator.
Checking the compatibility of the operator and the tariff
Before you start complex manipulations in the settings of the smartphone, you need to make sure that your mobile operator provides a call service over Wi-Fi. In Russia and CIS countries, this feature is supported by the largest players in the market, but it may not be activated by default on old tariff plans.
The most common operators, such as MTS, MegaFon, Beeline and Tele2, VoWiFi support has already been introduced for most modern smartphones, including Xiaomi, but even with carrier support, the service may require separate activation in the personal account or via the phone. USSD-team.
- 📱 Go to your operator’s application and find the section with communication services.
- 🔍 When searching for services, type "VoWiFi" or "Wi-Fi calls".
- ✅ If a service is found, make sure the switch is activated.
- 💬 If you can not find it yourself, contact the support chat with a question about the compatibility of your SIM-map.
It is also important to note that some virtual operators (MVNO) This feature may not be supported because it uses the infrastructure of other networks. SIM-Cards may need to be replaced by a new card or change the tariff.
Once the operator has confirmed support, restart the smartphone. Often after updating the server-side information on the network, the phone automatically receives the necessary profiles to activate the function.
Basic activation via Xiaomi’s settings menu
The easiest and safest way to enable Wi-Fi calls is to use the Android Settings menu, which the latest versions of MIUI 13, 14 and HyperOS have made this option prominent if the operator automatically pushed the settings profile.
To start, open the standard Phone app or go to the general system settings. You need to find the section for SIM cards and mobile networks. The interface may vary slightly depending on the firmware version, but the logic remains the same.
☑️ Pre-insertion check
Walk along the way: Settings → SIM-maps and mobile networks. Select the SIM card you want to enable the feature for (usually this is the SIM card). SIM 1 if it is the main one. Inside the menu, find a switch called "Wi-Fi Calling" or "Wi-Fi Calling".
If the switch is active and working, you are lucky to be able to turn on immediately. However, on many Redmi Note devices, especially global versions with Russian SIM cards, this item may be missing or inactive, in which case you need to move to more advanced activation methods.
⚠️ Note: If the Wi-Fi Calls switch is grey and not pressed, it means that the phone has not received confirmation from the operator or firmware has blocked this feature for your region.
Activation through engineering menu and codes
If the standard method didn’t work, you can try activating the feature through a hidden engineering menu, which is the deeper level of Android customization available on Xiaomi smartphones. Be careful when changing the settings in this menu, as incorrect actions can affect the operation of the radio module.
To enter the diagnostic menu, open the Phone app and type a special code. The most common code for checking the status of VoWiFi and LTE is # # #86583#. Once the last digit is entered, the message "VoLTE carrier check was DISABLED" (or ENABLED) should appear on the screen, which confirms that the operator check has been forcibly disabled, which often helps unlock hidden menus.
After entering the code, return to the settings SIM-Sometimes after this manipulation, a previously hidden switch appears there. If that doesn't happen, try another code specific to activating the menu: ##4636##.
In the Test menu that opens, select Phone Information. Scroll down to "Configure preferred network type." You can try changing the mode of the radio module, but for VoWiFi, the more important thing is that you have "Turn off VoLTE provisioning."
The following steps are taken in menu 4636:
1 Enter ##4636##
2. Select "Phone Information"
3.Look for "Turn off VoLTE provisioning"
4. Switch the switch (if available)
5. Reset the deviceThis method doesn’t work on all Redmi Note models, as manufacturers often block access to these settings in global firmware.If the menus are empty or items are inactive, move to the next section.
Use of Xiaomi EuCallee app and regional settings
One of the most effective ways to get VoWiFi to work on stubborn smartphones is to change the region of the device, and the logic is simple: in some countries (for example, India, Ukraine, Kazakhstan), Wi-Fi Calling support is built into the firmware more aggressively, and changing the region can “wake up” hidden functions.
To implement this method, go to Settings → Additionally. → Region. Change the current region to India or Ukraine. After the region changes, the phone may suggest a reboot or update the network settings. SIM-card.
If the region change didn’t help, you can use specialized activator applications such as Xiaomi EuCallee or Carrier Config Enabler. These utilities allow you to force upload configuration files of operators.
- 📥 Download. APK-Activator application file from a reliable source.
- 🔓 Allow installation from unknown sources in security settings.
- 🚀 Launch the application and follow the instructions on the screen to apply the patch.
- 🔄 Reboot your smartphone and check for the phone icon with Wi-Fi handset.
Keep in mind that installing third-party software requires care, and make sure you download files from official forums or trusted repositories to avoid infecting your device with malicious code.
Table of activation codes and statuses
For ease of navigation through hidden features and troubleshooting, we have compiled a table of core codes and their destinations. Use them to check the status of various services on your Xiaomi Redmi Note.
| Code/Command | Function | Outcome of implementation |
|---|---|---|
| ##86583## | Verification of the VoLTE operator | Disables operator check, opens hidden settings |
| ##4636## | Test menu | Opens access to information about the phone and batteries |
| ##869434## | VoLTE debugging mode | Includes logging and debugging (for advanced) |
| ##726633## | VoWiFi status | Shows a message about the on/off check |
It's safe to use these codes if you just switch the switches that are in the instructions. Don't change the values in fields that you don't know what they're going to do.
⚠️ Note: On some new versions MIUI The codes can be blocked, and then the system will simply ignore the input or write, "Code is invalid".
Possible problems and solutions
Even after successful activation, you may encounter a number of challenges, such as the icon of a Wi-Fi handset that can appear and disappear, often indicating an unstable connection between the router and the phone, or that the phone prefers a weak 4G signal over Wi-Fi.
In the settings SIM-The card often has a "Network Preference" option, and make sure it selects "Prefer Wi-Fi" or similar. If you don't have one, try temporarily disabling your mobile data or switching your phone to Wi-Fi Only mode (via air mode with Wi-Fi enabled) to check the function.
What to do if the badge does not appear?
Another common problem is that you can't make outgoing calls when you're in active Wi-Fi, and this may be due to router settings, and some providers block ports that are necessary for you to use. SIP-Try restarting your router or temporarily giving away Wi-Fi from another phone to check.
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If you frequently move between Wi-Fi and cellular areas, turn on the Handover feature (if available) so that the call does not interrupt when switching between networks.
In rare cases, the problem lies in the operator's profile. SIM-New card with modern security standards, especially if your card is more than 5 years old.
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The main key to success is an integrated approach: operator support + the correct settings of the phone + a stable router.