Modern mobile standards require not only high data rates, but also crystal clear sound during a conversation. Owners of the popular Xiaomi Redmi Note 8 Pro smartphone often wonder how to activate LTE voice technology, known as VoLTE. This feature allows you to not interrupt high-speed 4G connection during a call, ensuring simultaneous Internet and voice communication.
Activating this mode on your device can significantly improve the quality of communication, voice calls will be faster and connection delay will be reduced to a minimum, and you can continue to use the navigator or messengers without switching the network to 3G or 2G mode, which is especially important for active users.
In this article, we will discuss in detail the technical aspects of this technology based on the MediaTek Helio G90T processor, which is installed in the Redmi Note 8 Pro. You will learn how to properly configure network parameters, what to do if the HD icon does not appear, and what hidden menus may be needed to force the activation of the service from your operator.
Technological features of VoLTE on Redmi Note 8 Pro
Voice over LTE is a fourth-generation packet network, and unlike traditional calls, where voice is switched, it is converted to digital data packets. For the Xiaomi Redmi Note 8 Pro, it means using a wider bandwidth, which directly affects the audio codec, making the sound more voluminous and natural.
The main advantage is that the phone does not “fall” into the 3G network when incoming or outgoing calls. If you play an online game or watch high-resolution video, the 4G connection remains active. This is possible thanks to the IMS (IP Multimedia Subsystem) architecture, which is integrated into modern MIUI firmware. However, support from the operator's base stations is necessary to work correctly.
The Redmi Note 8 Pro supports two of the SIM-map-mode 4G, But the active voice channel VoLTE usually only works on one of them at a particular time, and the second card can stay in standby mode or use the same system. 4G only for data transmission, depending on the controller settings SIM-Understanding this logic of the radio module will help to avoid confusion in diagnosing problems.
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Use only the original SIM-Cards hand-cut with scissors to the size of nano-SIM may have damaged contacts, which will lead to unstable network operation and inability to activate VoLTE.
Verification of the compatibility of the operator and the tariff plan
Before digging into smartphone settings, you need to make sure your mobile carrier provides VoLTE service in your region.Not all tariff plans automatically include this option. In some cases, you need to connect an additional service or switch to a new tariff that supports the service. IP-telephony LTE.
It is also important to check if your account is registered. SIM-map 4G. If the phone is running on the 3G/H+, VoLTE activation is physically impossible. Make sure that the preferred network type is selected in the mobile network settings. LTE. Communication operators periodically update the list of supported devices, so even if the service did not work before, the situation could change after updating profile settings.
For subscribers of different operators, the conditions may differ, for example, some require sending USSD-The Xiaomi Redmi Note 8 Pro is certified by most major carriers, but may appear under a different model name or code on the compatibility list.
- 📱 Check for a badge"4G" or"LTE" at the status bar before trying to call.
- 💳 Make sure that SIM-The card is not too old (preferably not older) 3-4 years).
- 🌏 Find out on the operator’s website if your current geolocation is covered by VoLTE.
- 💰 Check balance and no locks on fare limiting voice services.
Basic activation via MIUI settings
Standard way of incorporating a function in the shell MIUI It's quite simple, but sometimes hidden in the submenu. First, open the Settings app and go to the section. SIM-maps and mobile networks, you have to choose from here. SIM-card for which you want to activate voice transmission LTE. The interface may vary slightly depending on the firmware version (MIUI 11, 12, 13 or more new).
In the menu of the selected SIM card, find the switch Use VoLTE or Calls through LTE. If it's present and active, just turn it on. Then restart the device. The status bar next to the network indicator should have an icon. HD Or the words VoLTE, which is a sign of a successful registration in the IMS-operator.
In some cases, the switch may be gray (inactive) or absent.This often indicates that the operator has not passed the appropriate settings profile to the phone, or in the configuration file of the device, this feature is blocked for your region. SIM-card again after switching on to initiate re-registration on the network.
☑️ Checklist of base activation
Advanced configuration through the engineering menu
If standard methods fail to activate the function, you can use the Android engineering menu. This method requires caution, since changing the wrong parameters can lead to unstable operation of the communication module. The most common way to enter the engineering test menu on the Redmi Note 8 Pro is to use the code # #4636## or command via the Phone app.
Once you enter the code, the test menu will open. Select Phone Information. There may be several tabs if you have two. SIM-Find the partition associated with VoLTE settings. You may need to activate the VoLTE Provisioned or Enable VoLTE switch. MIUI These items may be hidden or absent.
There is also a deeper layer of engineering menus available through manufacturer codes, such as ##3646633## for MediaTek-based devices. In this menu, go to the Telephony → VoLTE tab. You can force IMS mode on here. However, changing the settings in this section without understanding their purpose can lead to total network loss, so act carefully.
⚠️ Warning: Changing the settings in the engineering menu may result in resetting the network settings or inability to make calls.Write down the initial values before making changes so you can return everything as it was.
After making changes to the engineering menu, be sure to reboot the device. If after switching on the phone stopped seeing the network or lost the signal, try resetting the network to factory settings through the Settings menu → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth.
Table of statuses and indicators of the network
Understanding what the different icons in the status bar mean will help you diagnose the connection status. Below is a table explaining the main network statuses on the Xiaomi Redmi Note 8 Pro.
| Indicator | Meaning | VoLTE status |
|---|---|---|
| 4G / LTE | 4th generation network available | Inactive (calls via 3G/2G) |
| HD | High quality voice | Active and ready to call. |
| VoLTE | Mode of operation through LTE | Active (depending on operator) |
| 3G / H+ | 3rd generation network | Unavailable. |
If you see the badge 4G, But when the call starts, it changes instantly. 3G or+, So VoLTE doesn't work even if the switch is on in the settings, which means the phone couldn't register in the settings. IMS-The cause may be either a lack of coverage or a software conflict.
It is important to distinguish between the presence of the technology in the phone and its activation by the operator. Redmi Note 8 Pro hardware fully supports the standard, so the problems are often hidden in the software configuration or on the side of the service provider.
Why does the HD badge disappear during a call?
Solving common problems and errors
One of the common problems is that the VoLTE menu item disappears after the system update. MIUI They can change the list of allowed operators in the configuration files, in which case cleaning the cache of the Phone and Services application helps. SIM-Go to the settings. → Annexes → All apps, find the phone's system services and select Clean → Clear the cache.
Another common situation is that you have a VoLTE icon, but you can't make a call, which may indicate registration problems. IMS. Try to manually select the network operator. → SIM-maps and mobile networks, turn off automatic network selection and wait for the list of available carriers to appear.
If nothing works, you may need to change your phone’s settings, and some users have noted that when you switch to India or Indonesia (where VoLTE is very common), hidden settings become available, but this method has its own risks and can affect the operation of some local services.
- 🔄 Reset your network settings (not data!) through the recovery menu.
- 📲 Update the database of operators through the application "Services" SIM-map".
- 🔌 Check if the antivirus or firewall blocks network requests IMS.
- 🗺️ Change the region of the device in the main settings to unlock the functions.
⚠️ Warning: Changing the region to India can activate ads in Xiaomi system applications.Be prepared for this side effect if you decide to use this method to enable VoLTE.
Impact of firmware and system updates
The operating system version plays a critical role in networking functions. Global ROMs may differ from China ROMs or Indians in their range of supported frequencies and carriers. If you have reflashed your phone or installed custom builds, the lack of VoLTE may be due to the lack of necessary drivers or configs in the new system.
When you update your OTA, you often get new carrier profiles. If you had a stable job and it went missing after the upgrade, try a full Wipe Data reset. Make sure to back up important data before you do that, which will allow old configuration files that may conflict with the new system settings.
For advanced users, there is an option to add their operator to the list of supported through editing. XML-configuration files, but this requires root rights and knowledge of the Android file system. In most cases, just wait for the official update from Xiaomi, which will add support for your operator.
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The stable operation of VoLTE on the Redmi Note 8 Pro depends on the triad: SIM-map, operator support in your region and correct network profile settings MIUI.