Modern smartphones, including the popular model Redmi Note 9 Pro, equipped with many features to improve the quality of communication, one of which is the technology Voice over LTE. Although operators are actively promoting this standard for voice transmission through the Internet. 4G-network, not all regions coverage is stable, and some subscribers face problems interrupting calls or the inability to use the Internet and voice simultaneously. 9 Pro, remains relevant for many users who want to return the classic mode of operation. GSM/3G.
Disabling this option may be required not only because of a bad signal, but also to save battery power, as the constant search for a stable battery. 4G-The signal in the area of unreliable reception consumes a lot of battery resources, and in some cases, switching to standard communication protocols allows you to solve the problem of "loss" of the interlocutor or the appearance of echoes during a conversation. In this article, we will take a detailed look at all the available methods for deactivating the function, from simple settings in the menu to using engineering code.
It is important to understand that the interfaces of the MIUI shells may vary depending on the firmware version (Global, EU, China), so the location of menu items may vary. We will look at universal methods that are suitable for most configurations of the software of your device. Before making changes to the system settings, it is recommended to familiarize yourself with each method to choose the most secure and suitable for your situation.
Understanding VoLTE technology and the reasons for its disabling
Voice over LTE technology allows voice calls to be transmitted over fourth-generation networks, providing high audio quality and fast dialing. However, the implementation of this feature on Xiaomi smartphones sometimes causes conflicts with the equipment of local carriers. Users often notice that after updating the firmware, the phone stops correctly switching between 3G and 4G modes, which leads to a disconnection of the connection when incoming calls.
Another common reason for not using VoLTE is the inability to work simultaneously with the Internet and voice communication in some network configurations. If your operator does not support CSFB (Circuit Switched Fallback) technology correctly, then the Internet may completely turn off or go into EDGE mode when an incoming call, making it impossible to use the navigator or messengers during a conversation.
⚠️ Warning: Disabling VoLTE can lead to the fact that the sound quality when calling will become lower, and the connection time with the subscriber will increase by a factor of two. 2-5 It's normal behavior when you switch to standard protocols. 2G/3G.
Also worth mentioning is the impact on autonomy: a communications module, constantly trying to hold the unstable 4G signal for voice transmission, consumes significantly more power. In areas with poor 4G coverage, turning off VoLTE can extend the life of a smartphone by 15-20%. This is a critical factor for those who are on trips or places with weak signal.
Basic method of disabling through the standard settings menu
The easiest and safest way to deactivate the feature is to use the standard Android operating system and MIUI shell. Smartphone manufacturers usually give the user the ability to manage network preferences without the need for complex tools.
Find the section that connects to the mobile network, depending on the version. MIUI, it could be called «SIM-Maps and mobile networks" or "Mobile Network. Select the SIM card you want to disable if the device has two SIM-This is an important point, because the settings are applied individually for each slot.
In the menu that opens, find a switch called "Use VoLTE" or "LTE Calls." Put the slider in an inactive position. If the "HD" or "VoLTE" icon in the status bar is gone, then the operation was successful and the phone will use standard channels for voice communication.
☑️ Checking standard settings
In some cases, especially on global firmware, this switch may be hidden or blocked by the operator. If you do not find the appropriate item, this means that the setting is automatically controlled or alternative methods are required, which will be discussed below.
Use of the Engineering Menu for Advanced Users
If the standard interface doesn’t provide the right options, the engineering menu, a hidden part of the system designed to test hardware, comes to the rescue through a special set of commands in the Phone app, which gives you deeper control over the Xiaomi radio module.
To enter the menu, dial ##4636##. Once the last star is entered, the "Verification" menu automatically opens. Here, select "Phone Information" and be careful: changing the wrong settings can lead to temporary loss of communication.
In the list of options, find Set Preferred Network Type. In the drop-down list, select an option that does not contain the acronyms “IMS” or “VoLTE”, such as “LTE Only” (if you only need Internet) or “GSM/UMTS” (for forced 3G). However, to completely disable the voice function over 4G, it is often enough to simply remove the tick from the “VoLTE Provisioned” option if it is available in this version of the firmware.
| Parameter | Value for VoLTE | Meaning without VoLTE | Impact on communication |
|---|---|---|---|
| Network mode | LTE/TD-SCDMA/GSM | GSM/UMTS (WCDMA) | Reducing Internet speed to 3G |
| VoLTE Provisioned | On (True) | Turned off (False) | Direct shutdown of the function |
| IMS Registration | Registered. | Not registered. | Status indicator in line |
| Preferred type | NR/LTE/TD-SCDMA/GSM | TD-SCDMA/GSM | Forced 2G/3G |
⚠️ Warning: When leaving the engineering menu, do not press the "Back" button sharply, give the system 5-10 seconds to apply new parameters of the radio module.
It should be noted that after a smartphone reboot, the engineering menu settings may reset to factory values, this behavior depends on the policy of the carrier and the version of the baseband, in which case the procedure will have to be repeated after each device is turned on or use software methods for fixing the settings.
What if the code doesn't work?
Hidden settings through Activity Launcher
When a manufacturer hides a VoLTE switch in the standard menu and the engineering code doesn’t work or has the right options, you can use a third-party tool to access hidden system activities. The Activity Launcher app allows you to open any hidden Android settings pages, including those that have been removed by developers.
Once you install the application, you need to start a search for keywords. Type in the search bar "VoLTE" or "Mobile Network." The system will display a list of all the hidden activities associated with these queries. Find the item that leads to the settings page. SIM-maps where the desired tumbler is present.
Often the activity you need is called “Mobile Network Settings” or has the name of the service provider in the name. Clicking on the link, you will see a full list of options, including those hidden in the regular menu. Activate or deactivate the VoLTE switch, and the changes will take effect immediately.
This method is particularly effective on global firmware devices, where functionality is stripped down compared to the Chinese versions, it does not require root rights and is relatively secure, since you interact with the regular but hidden interfaces of the system.
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Save the shortcut: Once you find the right hidden setting in Activity Launcher, create a shortcut on your desktop to quickly switch VoLTE in the future without re-searching the menu depths.
Comparison of methods and possible problems after disconnection
The choice of the method of disconnection depends on your goals and technical literacy. The standard menu is suitable for most users, the engineering code gives quick access to radio settings, and Activity Launcher allows you to find hidden switches. Each method has its advantages and disadvantages that are worth considering.
After disabling VoLTE, you may experience a number of changes in how your phone works: First, the “4G” or “LTE” icon may disappear during a conversation, changing to “H+” or “3G.” This is the expected behavior, indicating that voice is transmitted through second or third-generation channels while data remains on 4G (if supported) or also switches to 3G.
Second, the behavior of missed call notifications can change. 3G/2G delivery SMS Missed calls work differently than in the IMS-It is also worthwhile to be prepared for the fact that in some modern tariffs of operators the quality of communication in the network is not limited to the network. 3G may be lower than in 4G, due to offloading old frequencies.
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The best solution for most users is to use a standard switch in the menu. SIM-This ensures the stability of the system after updates.
If after disabling the function, the phone stopped seeing the network or there were constant switches between modes, try resetting the network settings. This will return all the parameters of the radio module to the original state, after which you can try to adjust the preferences again, but with VoLTE disabled.