How to enable VoLTE on Xiaomi Redmi 9: detailed instructions with solutions to problems

VoLTE Technology (Voice over) LTE) allows you to call online 4G, Xiaomi Redmi 9 owners often face a problem: the feature is either missing from the menu or not activated despite operator support, SIM-map or regional restrictions.

In this article, you will find 3 working ways to enable VoLTE on Redmi 9 (including Redmi 9A/9C/9T models), as well as solutions to typical errors: no item in the menu, reset settings after updating or "unsupported SIM". All instructions are tested on current versions of MIUI 12-14 and adapted for Russian operators (MTS, Beeline, MegaFon, Tele2).

Before you start, check two key points: your carrier should support VoLTE in your region (check on the official website), and SIM-map USIM (obsolete SIM). If these conditions are met, go to the settings.

1. Method. №1: Enabling VoLTE through standard settings MIUI

The easiest method is activation via the phone menu. On Redmi 9, the path to VoLTE settings may vary depending on the firmware version, but the overall scheme is as follows:

Open the Settings. → SIM-maps and mobile networks. SIM-Select the card you want to activate VoLTE for (usually the main card in slot 1). 4G (VoLTE) and move the slider to the "On" position.".

⚠️ Note: Some firmware may refer to the item as Improved Calls or HD-If it's not, it's hidden (solution in the next section).

Once activated, an HD or VoLTE icon will appear next to the network indicator (depending on the operator). To check the performance, make a test call: the connection should be established instantly, without the delay of 1-2 seconds typical for 3G.

Make sure that SIM-card USIM|

Check 4G coverage in your area |

Update the firmware to the latest version of MIUI|

Reboot your phone before settings-->

2. Method. №2: Activation via the Engineering Menu (if VoLTE is hidden)

If you don't have VoLTE in your settings, you can turn it on through the engineering menu (hidden service section), which works on Redmi 9 with MIUI 12-14 firmware, but you need to be careful that incorrect changes can disrupt the network.

Instructions:

1. Open the phone app and enter the combination: ##4636##
2. In the menu that opens, select Phone Information (or Phone Information).
3. Scroll down to the Set preferred network type block.
4. Choose LTE/UMTS auto (PRL) or LTE only (if available).
5. Go back to the main menu and find the VoLTE provisioned item – if it is disabled, tap it to activate it.

⚠️ Attention: Some firmware may lose mobile Internet after this manipulation, in which case restart the phone or return the network settings to factory (Settings) → System system → Reset → Resetting network settings).

If the engineering menu doesn't open, your firmware is blocking access. MIUI or №3 (through) SIM-map).

3. Method. №3: Replacement SIM-maps or reset operator settings

The most common reason for the lack of VoLTE is outdated SIM-card or operator settings, even if your card looks like USIM, It can be released before the introduction of VoLTE (until 2018), the solution is to contact the communication salon for a replacement.

If SIM-The card is new, but VoLTE is not working:

1. Go to Settings. → SIM-maps and mobile networks.
2. Choose yours. SIM-map and tap Network reset (or Reset) APN).
3. After the reboot, the phone will automatically receive new parameters from the operator.

For manually configuring the APN (if automatic reset didn't help):

1. In the same menu, select Access Points (APN).
2. Create a new profile with your operator’s parameters (you can find them on the official website).
3. In the APN type field, add the ims value (example: default,supl,ims).

Critical detail: if after the reset VoLTE appeared, but after a day disappeared - the problem is on the operator's side. IMS-profile.

Table: Compatibility of VoLTE on Redmi 9 with Russian operators

Not all operators support VoLTE on Xiaomi Redmi 9 in the same way. In the table below, you can see the latest coverage and customization data:

If your operator is not specified or VoLTE does not work despite promises of support, contact the technical service (USSD-request *#004#).

5. Problem Solving: VoLTE is not turned on or is lost

Let’s look at common mistakes and ways to eliminate them:

• 🔄 The VoLTE item disappeared after the update MIUI: Resetting network settings (Settings) → System system → Reset → Reset network settings) or rollback to a previous firmware version.
• 📵 VoLTE icon flashes and goes missing: Network sign-up problem IMS. Try to manually select a network 4G In Settings → SIM-map → Preferred type of network → Only LTE.
• 🔕 Calls are broken when switching to 3G: Turn off the switch to switch option 3G to save charge in battery settings.
• 🚫 "Unsupported SIM" When VoLTE is enabled: Replace SIM-map USIM Or contact the operator for binding. IMS-profile.

If neither method worked, check to see if VoLTE is blocking regional firmware, like Redmi 9 with firmware for India (IN) china (CN) The function can be disabled at the software level. The solution is to reflash the phone to the global (Global) or European (European (EEA) version MIUI.

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Before you run your firmware, back up your data via Settings → About Phone → Backup. Use official firmware from Xiaomi to avoid blocking IMEI.

Alternative methods: Annexes and USSD-team

If the standard methods don’t work, try activating VoLTE via the USSD-This method is suitable for advanced users and requires caution.

USSD-commands for activating VoLTE:

• For MTS: dial *111*54# and follow the instructions.
• For Beeline: Send a request *322# and select "Activate VoLTE".
• For MegaFon: use the command *105*07#.

If the USSD didn't help, install the 4G LTE Switch app from Google Play, which allows you to force VoLTE to be enabled even on unofficial firmware.

1. Launch the application and grant access rights to network settings.
2. Choose yours. SIM-Enable the Enable VoLTE option.
3. Reboot the phone.

⚠️ Attention: Apps like 4G LTE Switch may conflict with system services MIUI. If after using them, mobile Internet disappeared, delete the program and reset the network settings.

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USSD-Teams and third-party applications are a temporary solution. For stable VoLTE, upgrade your firmware to the latest version or replace it. SIM-map USIM.

7. Frequent Questions and Myths About VoLTE on Xiaomi

Let’s look at some common misconceptions and questions from Redmi 9 users:

8.Conclusion: What to do if nothing has worked?

If you’ve tried all the ways, but VoLTE on the Xiaomi Redmi 9 never worked, there are three options:

1. Contact the operator: Your number may not be tied to IMS-Ask for support to check the VoLTE status for your line.
2. Reflash the phone: Install a global firmware MIUI (for example, miui_LANCERGlobal for Redmi 9) via Fastboot or Recovery.
3. Use workarounds: Activate Wi-Fi Calling as an alternative to VoLTE. → SIM-map → Wi-Fi calls.

Last tip: if you bought Redmi 9 in the grey way (unofficial imports), check to see if VoLTE is blocked at the regional level. For example, on the Chinese versions (Redmi 9 China), the function is often disabled, the solution is unlocking the bootloader and firmware global software.

If you have any specific questions about configuration, check out your Redmi 9 model (9A, 9C, 9T or standard version), the operator, and the MIUI version.