Xiaomi Redmi Note 6 Pro (codename tulip) is still a popular choice among users who value the balance of performance and price, but many owners face a problem: despite support for VoLTE (voice over 4G), the feature is disabled by default or unstable. In this article, we will discuss why this happens, how to properly activate VoLTE on the Redmi Note 6 Pro, and what to do if the operator does not support the technology.
It's important to understand that VoLTE is not just about "improved calls," it's a separate protocol that provides high-quality communication, fast connection and the ability to talk and use the mobile Internet at the same time. 3G/2G, It slows down the Internet. 6 Pro function is supported hardware, but its operation depends on three factors: firmware, SIM-operator's maps and settings.
If you've never turned on VoLTE on your device, or if you've lost the feature after the MIUI update, don't be quick to blame your smartphone. 80% of the time, the problem is with the wrong settings or the outdated version of the software. Next, we'll take a step-by-step look at all possible scenarios, from basic activation to manual editing of configuration files.
Verify VoLTE support on Redmi Note 6 Pro
Before you try to turn on VoLTE, make sure your device and SIM-The Redmi Note 6 Pro always has hardware support (the Qualcomm Snapdragon 636 chipset is compatible with VoLTE), but there may be nuances with the software part.
To verify, follow the following steps:
- 📱 Device Model: Go to Settings → About the phone and make sure that the model is Redmi Note 6 Pro (code tulip).Some clones or modifications (for example, for the Indian market) may have restrictions.
- 📶 Operator support: VoLTE should support your mobile operator. In Russia, the technology is officially provided by MegaFon, Beeline, Tele2 and MTS (but not in all regions.
- 🔄 Version. MIUI: VoLTE is stable and works on MIUI 10 and newer: If you have custom firmware (like LineageOS), support may not be available.
To know if you are supporting your SIM-VoLTE card, paste it into another smartphone with an activated function (such as an iPhone or Samsung Galaxy) and check if the icon appears HD Or VoLTE when you call, and if you don't, you're the operator.
Basic settings of VoLTE via the MIUI menu
If hardware and software support are confirmed, then we move on to customization. In most cases, VoLTE is enabled via the standard MIUI menu, but the path may vary depending on the firmware version.
Instructions for Redmi Note 6 Pro:
- Open Settings (the gear icon on the main screen).
- Go to section. SIM-maps and mobile networks.
- Choose yours. SIM-card (if two of them).
- Tap on the network type or preferred network type.
- In the options list, select 4G (preferably)/LTE or 4G/3G/2G (auto).
- Go back and find the VoLTE switch (can be called 4G Calls or Improved Calls). Activate it.
Once turned on, restart your smartphone. If everything goes well, an HD or VoLTE icon will appear in the status bar next to the network indicator. If there is no switch, read the next section.
☑️ Preparation for the inclusion of VoLTE
What to do if there is no VoLTE option in the settings
The lack of a VoLTE option on the menu is a common problem on the Redmi Note 6 Pro.
- 🔧 The firmware does not support VoLTE (obsolete or custom version). MIUI).
- 📱 The device is locked for a specific region (e.g., the Chinese version for the domestic market).
- 📡 The operator does not provide VoLTE service for your tariff or region.
Decisions of the order:
1. MIUI Update. Go to Settings → About Phone → System Update and check for updates. If there are no updates but your version is older than MIUI 11, download the latest tulip firmware from Xiaomi’s official website and install it manually through Recovery.
2. Network resetting. Sometimes APN and network resets help:
→ SIM-maps and mobile networks → [Your SIM] → Access Points (APN) → Menu (three points) → Reset to factoryAfter reset, restart the phone.
3. Manual editing of settings. If VoLTE is supported, but the option is hidden, you can try activating it through the engineering menu:
##4636##In the menu that opens, select Phone Information → Install preferred network type → LTE only or LTE/WCDMA/GSM auto. This method does not work on all versions of MIUI and can cause communication failures - use at your own risk.
How to return the standard settings after experimenting with the engineering menu?
Problems with VoLTE: Typical Errors and Solutions
Even after successful activation of VoLTE, failures can occur, and below is a table of the most common problems and ways to fix them:
| Problem. | Possible cause | Decision |
|---|---|---|
| VoLTE icon appears, but calls go through 3G | Operator does not prioritize VoLTE for your region | Call in support of the operator and request the activation of the service |
| When you call, the Internet goes missing. | VoLTE is not activated or works in CSFB (fallback on 3G) mode | Check the APN settings (IPv4/IPv6) |
| There is no VoLTE badge, but calls are made in HD-quality | The operator uses its own implementation of VoLTE without indication | Check the quality of the connection – if it has improved, the function works |
| After the MIUI update, VoLTE disappeared. | Reset network settings or conflict with the new firmware version | Reset the APN and restart the phone |
If none of the methods worked, try an alternative method: install SIM-The card to another smartphone (e.g. Redmi Note 8 Pro), activate VoLTE there, then return the card back to Redmi Note 6 Pro. SIM operator-side.
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If you have a two-sim Redmi Note 6 Pro, VoLTE will work only on the main SIM-card 1). Second second SIM Always use it. 3G/2G call-in.
VoLTE and custom firmware: features of setting
Users who have installed informal firmware (LineageOS, Pixel Experience, AOSP) often face a lack of VoLTE, which is because custom builds do not include proprietary drivers and configurations for Qualcomm responsible for the modem.
To restore VoLTE on custom firmware:
- Make sure the firmware is based on the latest version of MIUI for tulip (e.g. ported MIUI 12.5).
- Download and stream through TWRP the package firmware and vendor from the official MIUI of the same version as your firmware.
- Install the VoLTE fix module via Magisk (e.g. IMS Fix for Qualcomm).
- Check the APN settings – they should match the original one from the operator.
Example of correct APN for MegaFon (VoLTE):
Name: Megafon 4G
APN: internet
Proxy: Not specified
Port: Not specified
Username: gdata
Password: gdata
Type of authentication: PAP
Type APN: default,supl,ia
APN Protocol: IPv4/IPv6
Roaming: on⚠️ Note: Installing an inappropriate firmware or vendor may result in loss IMEI Or a brick of a device. Always backup through TWRP before experimentation.
How to Check if VoLTE Really Works
Many users mistakenly believe that if an HD or VoLTE icon appears in the status bar, the function works correctly. In fact, this is not always the case.
Method 1: Call test. Call another smartphone with VoLTE support (e.g. iPhone or Samsung) if:
- 🔊 The call is connected instantly (without delay in the 1-2 seconds) - VoLTE is active.
- 📶 During the conversation, the network indicator remains 4G/LTE (switch off 3G) — VoLTE is working.
- 🎤 Voice quality is noticeably cleaner (no noise, echo) - confirmation HD-call.
Method 2: Engineering menu. Dial ##4636## → Phone information → See Voice network type. If it says LTE or IMS, VoLTE is active. If UMTS or GSM, calls go through 3G/2G.
Method 3: Speedtest during a call. Run a test of Internet speed (for example, through the Speedtest app) and call someone at the same time. If the speed has not dropped to 3G (for example, remained at 10-50 Mbps), VoLTE works.
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If the Internet speed drops to 0 during the call or switches to 3G, VoLTE is inactive, even if the icon is displayed.
Alternatives to VoLTE: Wi-Fi Calling and ViLTE
If VoLTE never worked, consider alternative technologies:
1. Wi-Fi Calling. Allows you to call over Wi-Fi if the mobile network is weak. → SIM-maps and mobile networks → [Yours. SIM] → Wi-Fi calls. runs on Redmi Note 6 Pro with MIUI 11 and newer, but requires operator support (in Russia – MegaFon, MTS, Beeline).
2. ViLTE (Video over LTE) Video calls as HD over 4G. Activated automatically when VoLTE is enabled, but not supported by all operators.
3. VoIP applications. If the carrier does not support VoLTE, use WhatsApp, Telegram or Skype for calls over the Internet. The quality will be worse than VoLTE, but more stable than 3G.
⚠️ Note: Wi-Fi Calling and VoLTE cannot work simultaneously on the Redmi Note 6 Pro. If you turn on Wi-Fi calls, VoLTE will automatically shut down and vice versa.