How to turn VoLTE on Xiaomi Mi 9 Lite: a complete guide with pictures and tips

VoLTE Technology (Voice over) LTE) allows you to call online 4G, Providing a clearer voice and faster communication on the Xiaomi Mi 9 Lite (also known as the Mi 9 Lite). CC9 In China, it's supported, but it's often disabled by default. Why? Manufacturers don't always activate it for all regions because of the differences in operator support. But you can turn on VoLTE yourself, and it won't take more than 5 minutes.

Many users mistakenly think that VoLTE needs a special tariff or a new one. SIM-In fact, it is enough to set up your smartphone correctly and make sure that your operator supports the technology. This article provides a step-by-step instruction with pictures, a compatibility table with Russian operators, and solving typical problems (for example, when VoLTE is turned on but does not work).

If you have never used VoLTE, you will notice:

• ✅ Instant connection - without delay when dialing.
• ✅ Clean sound without noise (as in messengers).
• ✅ No switching over. 3G When you call, the internet continues to work at speed. 4G.

But there are nuances: For example, on the Mi 9 Lite with custom firmware (like LineageOS), VoLTE may not work due to lack of certificates. IMS. About it in the section on problems.

1. Verify your operator’s support for VoLTE

Before setting up your phone, make sure your mobile operator supports VoLTE in your region.

• 📡 MTS - VoLTE coverage at 80+ Regions (full list on MTS website).
• 📡 Beeline – works in all major cities, but requires SIM-nano-SIM map (USIM).
• 📡 MegaFon supports VoLTE at all rates, except archival ones.
• 📡 Tele2 – limited coverage (mainly Moscow, St. Petersburg, millionaires).
• 📡 Yota – VoLTE is available only on unlimited minutes.

To check for support:

1. Open your operator’s website and search for the “Coverage” or “Technology” section.
2. Use the VoLTE verification service – enter your phone number and get a report.
3. Call the operator support and check if the service is activated for your number.

Even if the carrier supports VoLTE, the Mi 9 Lite may need to be updated. MIUI 10 Functions are often absent from the menu.

2.Preparation of the telephone: update and SIM-map

Before turning on VoLTE, follow two mandatory steps:

1. Update the firmware to the latest version MIUI: Go to Settings. → The phone. → Update system. Click "Check Updates" and install all available patches. For Mi 9 Lite, the current version is available — MIUI 12.5 or later (at 2026).
2. Check it out. SIM-Map: VoLTE only works with USIM-Nano-format maps. Old ones. SIM logoless 4G If the card is issued before 2018, contact the operator's cabin for a replacement (free of charge).

Update to MIUI 12.5+

Check the format SIM-maps (should be) USIM)

Check the VoLTE coverage from the operator

Restart the phone after the update-->

If there is no "VoLTE" option in the settings after the update, perhaps your version MIUI — "Global (Global) and not European" (EEA). In this case:

⚠️ Note: Some Mi 9 Lite firmware (e.g, MIUI 11 Global) VoLTE option hidden. Solution - install EEA-version via Fastboot or use custom firmware.

3. Step-by-step instruction: how to turn on VoLTE

Here are 3 official ways to activate VoLTE on the Xiaomi Mi 9 Lite:

Method 1: Through phone settings (recommended)

1. Open the Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-card (if two of them).
3. Tapping on "Call on" LTE" (VoLTE).
4. Activate the switch in the "On" position.
5. Reboot your phone (required!).

Method 2: Through code USSD (for certain operators)

Some operators (e.g. MegaFon) allow you to enable VoLTE via USSD-team:

##4636##

After entering:

1. Select Phone Information.
2. Scroll down to Set preferred network type.
3. Choose. LTE/UMTS auto (PRL) or LTE only.
4. Go back and find the VoLTE provisioned item – there should be Yes.

Method 3: Through the Engineering Menu (for the experienced)

If the first two methods didn’t work, try the engineering menu:

##36446337##

Next:

1. Go to BandMode.
2. Choose yours. SIM-map.
3. Install. LTE Band in Auto mode.
4. Enable the VoLTE Switch option.

💡

If VoLTE calls fail after activation, try disabling Wi-Fi Calling (if it's on), the two features that sometimes conflict with Xiaomi.

4.How to check that VoLTE works

Once turned on, you need to make sure that the technology is actually active. Here are 4 ways to check:

• 📞 Status bar indicator: during the call, an inscription should appear next to the operator HD, VoLTE or icon 4G.
• 🔍 USSD-code: dial ##4636## → Phone information → See the status of VoLTE provisioned.
• 📊 Internet speed during a call: run a speed test (for example, in Speedtest) and call someone. 3G — VoLTE is working.
• 🎧 Sound quality: ask the person to rate the clarity of your voice. In VoLTE, it should sound like WhatsApp".

If the indicator HD/VoLTE No, but the calls are in 4G, The operator may be using ViLTE (video calls) LTE) Instead of classic VoLTE. Please clarify that in support.

💡

On Xiaomi Mi 9 Lite, with active VoLTE, the icon is displayed in the status bar 4G+, not 3G, even during the conversation.

Table: Compatibility of VoLTE with Mi 9 Lite operators

Below are the data on VoLTE support on Xiaomi Mi 9 Lite for the main Russian operators (currently for 2026):

If your carrier is not on the list or VoLTE is not working, try:

• 🔄 Reset network settings: Settings → SIM-map → Resetting mobile network settings.
• 📱 Install EEA-Firmware (if you have a Global Firmware).
• 📞 Call for support from the operator to link IMS-profile.

6. Solving VoLTE problems on Mi 9 Lite

VoLTE may not work even after setting it up properly.-5 causes and solutions:

Problem 1: No VoLTE item in the settings

Reasons:

• Outdated firmware (MIUI 10/11).
• Absent. IMS-certificate for your region.
• Installed custom firmware without support for VoLTE.

Decision:

1. Update to MIUI 12.5+.
2. If there are no updates, install them. EEA-version via Fastboot.
3. Custom firmware (e.g. Pixel Experience) requires a patch IMS.

Problem 2: VoLTE is turned on, but calls don't go through

Reasons:

• Conflict with Wi-Fi Calling.
• Wrong settings APN.
• Lockdown IMS the operator (for example, due to debts).

Decision:

1. Turn off Wi-Fi Calling in the SIM- card settings.


2. Reset APN: Settings → SIM- of the → Card Access Point (APN) → Reset.




3. Call the operator and ask to check the status of the IMS.

Problem 3: The Internet goes missing during the call

This means that the phone is switching to 3G. Possible causes:

• VoLTE is not activated on the operator side.
• Weak signal. 4G (phone drops on 3G).
• In the network settings selected mode 3G/4G (auto 4G only.

Problem 4: VoLTE is missing after the update

Sometimes after the update. MIUI The settings are reset:

1. Check if the VoLTE switch has turned off in the settings.
2. Reset network settings (Settings) → SIM-map → Reset).
3. If it doesn’t work, it will go back to the previous version.

Problem 5: Low sound quality in VoLTE

If the voice of the interlocutor sounds robotically or with delays:

• Check if the codecs are activated. EVS (On the Mi 9 Lite, it can run unstablely.
• Turn it off. EVS via the engineering menu (#36446337## → Audio → VoLTE Codec → choose AMR-WB).

⚠️ Warning: Some Mi 9 Lite firmwares have VoLTE activation causing a quick battery drain. If you notice an increased consumption, turn off the function and use standard calls over the phone. 3G.

7.VoLTE alternatives: Wi-Fi Calling and ViLTE

If VoLTE is not working or your carrier does not support it, consider alternatives:

Wi-Fi Calling

The technology allows you to call over Wi-Fi, which is useful in areas with poor coverage 4G. How to turn it on:

1. Settings → SIM-map → Wi-Fi Calling.
2. Activate the switch and follow the instructions (confirmation may be required via the SMS).

Limitations:

• It works only with supported operators (MTS, MegaFon, Beeline).
• It requires a stable connection to Wi-Fi.

ViLTE (Video calls by 4G)

Some operators (for example, MTS) offer video calls to the Internet. LTE. For that:

1. Install the official operator application (for example, MTS Connect).
2. Enable the ViLTE option in the application settings.

Messengers with voice calls

If VoLTE is not available, use:

• 📱 WhatsApp – calls over the Internet (requires little traffic).
• 📱 Telegram supports VoIP-calls with encryption.
• 📱 Viber – Optimized for a weak Internet.

However, please note: calls via messengers do not replace standard calls – they are not displayed in the log and can be blocked by a firewall on corporate networks.

8. Frequently Asked Questions (FAQ)

If your question isn’t on the list, check the issue section or check with the operator for details – sometimes a VoLTE lock is related to the tariff or subscriber status.