How to Enable Wi-Fi Calling on the Xiaomi Redmi Note 8 Pro: A Complete Guide

Wi-Fi Calling (VoWiFi) on Xiaomi Redmi Note 8 Pro VoWiFi is a technology that allows you to make voice calls over the internet instead of a cellular network. This feature is especially useful in areas with poor mobile coverage but stable Wi-Fi, such as a basement, an office with thick walls, or a country house. Unlike messaging apps like WhatsApp, VoWiFi is integrated into the standard Phone app and uses your regular phone number—your caller doesn't even need to install any additional apps.

However, not all operators support this technology, and on some firmware versions MIUI The option may be hidden. In this article, we'll look at how to check your device's compatibility. Redmi Note 8 Pro With VoWiFi, activate the feature in the settings, and troubleshoot common issues. We'll also find out why calls may be dropped and how to avoid it.

What is VoWiFi and why is it needed on the Redmi Note 8 Pro?

Technology Voice over Wi-Fi (VoWiFi) Transmits voice traffic over an internet connection instead of traditional cell towers. This offers several key advantages:

• 📶 The best coverage: calls work in places where the cellular network is weak but there is Wi-Fi (for example, in the subway or deep in a building).
• 🔋 Battery saving: The phone does not waste energy searching for a network if it is connected to Wi-Fi.
• 💰 Free callsIf your plan includes unlimited calls, VoWiFi doesn't burn them up—the traffic goes over the Internet.
• 🔒 Smooth transition: When leaving the Wi-Fi zone, the call automatically switches to the cellular network (if the operator supports it) eSIM or IMS).

On Redmi Note 8 Pro VoWiFi works via the protocol IMS (IP Multimedia Subsystem), which must be supported by both the phone and the carrier. Important: This feature is only available on official firmware. MIUI (global or Chinese version) and requires activation in the SIM card.

Checking if your carrier supports VoWiFi

Before setting up your phone, make sure your mobile operator supports Wi-Fi calling. In Russia, as of early 2026, the technology is officially available:

If your operator is not on the list or you are using a virtual provider (for example, Tinkoff Mobile), VoWiFi is likely unavailable. You can find out the latest information:

• 📞 By calling the operator's support (tell them that you need VoWiFi or IMS calls).
• 🌐 On the official website in the "Services" or "Technologies" section.
• 📱 In your personal account in the operator's mobile app (look for the "SIM card settings" tab).

⚠️ AttentionSome carriers only enable VoWiFi for new SIM cards (issued after 2022). If your card is older, you may need a replacement.

Preparing the Redmi Note 8 Pro for VoWiFi activation

Before setting up, make sure that your Redmi Note 8 Pro meets the following requirements:

Update MIUI to the latest version (minimum MIUI 12)

Install the SIM card into the slot SIM 1 (VoWiFi may not work in slot 2)

Connect to a stable Wi-Fi network (2.4 GHz or 5 GHz)

Disable VPN and proxy servers in settings

Check that the function Mobile data transfer included-->

If you use two SIM cards, VoWiFi will only work on the one that is installed in Slot 1. Also make sure that:

• 🔄 It's turned on on the phone airplane mode with manual Wi-Fi activation (for testing).
• 📱 The option is activated in the SIM card settings Use for calls.
• 🔒 There are no restrictions on outgoing calls (e.g. parental controls).

If your Redmi Note 8 Pro purchased abroad (for example, the Chinese version) MTK Helio G90T), you may need to flash the global version MIUIOtherwise, the VoWiFi option may not be available in the menu.

Step-by-step instructions: how to enable Wi-Fi calling

If all the conditions are met, we proceed to activating VoWiFi. The instructions are relevant for MIUI 12–14:

1. Open the app Settings (gear icon on the main screen).

2. Go to the section SIM cards and mobile networks.

3. Select your SIM card (eg. SIM 1: MTS).

4. Tap on the item Wi-Fi calling (or Wi-Fi Calling (on English firmware).

5. Activate the switch Wi-Fi calling and confirm your choice in the pop-up window.

6. Wait for the message Activated (You may need to restart your phone).

Once enabled, an icon will appear in the status bar (upper right corner of the screen) VoWiFi or Wi-Fi CallingIf there is no icon, check:

• 🔄 Restart your phone.
• 📶 Reconnect to Wi-Fi.
• 📞 Try making a test call (for example, to 112—it's free and works without a SIM card).

On some firmware versions MIUI The VoWiFi option is hidden. To unlock it, enter the code in the Phone app. ##869434## (for models with a processor Mediatek).

What should I do if there is no "Wi-Fi Calling" option?

If the VoWiFi option is missing from the settings, this may mean:

1. Your operator does not support the technology (even if the phone is compatible).

2. Custom firmware is installed (for example, LineageOS), in which the function is disabled.

3. The SIM card is not activated for IMS services (replacement or call to support required).

In this case, try updating the firmware via Settings → About phone → System update or contact your operator to check SIM card compatibility.

Solving Common VoWiFi Problems

If Wi-Fi calling isn't working or keeps dropping, try these troubleshooting steps:

If the problem persists, reset your network settings:

1. Go to Settings → SIM cards & mobile networks → Reset network settings.
2. Confirm the action and restart your phone.
3. Reactivate VoWiFi and check the connection.

⚠️ AttentionResetting your network will delete all saved Wi-Fi passwords and Bluetooth settings. Make sure to write down your connection information beforehand.

How to improve Wi-Fi call quality

To avoid interruptions and interference during a call, follow these tips:

• 📶 Use 5 GHz: This frequency is less crowded and provides a more stable connection than 2.4 GHz.
• 🔌 Turn off battery saving: In the settings Battery → Battery Saver Add the Phone app to exceptions.
• 🔒 Update your router: Outdated router firmware may block VoIP traffic. Check for updates in the router's web interface (usually 192.168.1.1).
• 📱 Activate HD voice: In the SIM card settings, enable the option Enhanced call quality (HD), if available.

If you frequently make calls over Wi-Fi, consider purchasing Mesh systems (For example, Xiaomi Mi Wi-Fi Mesh) to boost the signal throughout the house. It's also helpful to disable the "Speed" function on your router. Band Steering (automatic switching between frequencies), as it can cause short-term connection interruptions.

VoWiFi Alternatives: What to Do If It's Not Working

If your operator does not support VoWiFi or Redmi Note 8 Pro is not compatible with the technology, please use alternative methods of making calls via the Internet:

• 📲 Google Duel (Duo): An application from Google with high connection quality, works even on slow internet.
• 💬 WhatsApp/Telegram: Calls via instant messengers are free, but require installation by both parties.
• 📞 Skype: Supports calls to regular numbers (paid) and between Skype users (free).
• 🔄 SIM card with eSIM: Some operators (eg. MTS) offer virtual SIM cards with VoWiFi support.

The main drawback of alternatives is that the person you're calling must also use the same app. If you need a standard call to any number, consider purchasing Wi-Fi router with 3G/4G support (For example, Huawei B535). It creates a local cellular network to which the phone connects, and calls are made over the Internet, but as if through a regular mobile connection.

FAQ: Answers to frequently asked questions about VoWiFi on the Redmi Note 8 Pro

Is it possible to use VoWiFi without a SIM card?

No, VoWiFi technology is tied to your SIM card and your phone number. Without a physical or virtual SIM card, Wi-Fi calling is impossible. However, you can make SIM-free calls via messaging apps (WhatsApp, Telegram), but only to other accounts within those apps.

Why does VoWiFi only work on some Wi-Fi networks?

Some public networks (such as those in cafes or airports) block VoIP traffic. The problem could also be in your router settings: check if the protocol is enabled. UDP and are the ports open? 500, 4500, 5060–5061At home, try disabling the firewall on your router.

Will VoWiFi work abroad?

Yes, but with some caveats: the call will go through the internet, but will be charged as an international call (if you're calling a Russian number). Some operators (for example, Megaphone) offer a "Wi-Fi Calling Abroad" option with discounted rates. Check with your provider for details.

Is it possible to enable VoWiFi on two SIM cards at the same time?

No, on Redmi Note 8 Pro The function works only for one SIM card (usually for Slot 1). If you need to make calls over Wi-Fi from a different number, temporarily move the SIM card to the first slot.

How to disable VoWiFi if it interferes?

To deactivate Wi-Fi calling, go to Settings → SIM cards & mobile networks → Wi-Fi calling and turn off the switch. You can also temporarily put the phone into sleep mode. LTE only (in mobile network settings) to force the use of cellular communication.