Modern users of Xiaomi and Redmi smartphones often face the appearance of new, incomprehensible icons in the status bar. One of the most common questions is a mysterious inscription or VoLTE icon, which can appear at the top of the screen after a system update or change. SIM-This symbol indicates the activation of voice technology over a fourth generation network. LTE, What is the quality standard of communication this year.
The appearance of this indicator means that your Redmi Note or Poco has moved to a more advanced communication protocol that allows you to simultaneously talk and use high-speed Internet without switching to 3G or 2G. Device owners often wonder whether to leave this feature on or deactivate it to save resources. The answers to these questions require a detailed analysis of the technology and its impact on the work of the gadget.
In this article, we will discuss the technical essence of Voice over. LTE, This feature is critical for users whose operators have already implemented support. HD-call, and show a step-by-step algorithm for enabling the function in the shell MIUI Understanding these processes will help you customize your smartphone for the most comfortable communication possible.
Technical essence of the technology Voice over LTE
Voice over LTE is a standard for voice traffic exclusively over fourth-generation networks. Before the mass adoption of 4G, smartphones were forced to fall on third-generation (3G) or second-generation (2G) networks when they made an incoming or outgoing call, because LTE networks only supported data transmission, and now voice stream is digitized and transmitted as a data packet, which fundamentally changes the quality of the connection.
The main advantage is the speed of connection. dial-up time is reduced from 5-7 seconds to 1-2 seconds, which makes the communication process almost instantaneous. In addition, it uses a high-resolution codec that provides crystal clear sound without the characteristic wheezing and noise characteristic of old GSM networks.
It is important to note that VoLTE does not consume Internet traffic in the usual sense, although technically voice is transmitted through the Internet. IP-Protocol: Operators charge minutes like regular voice calls as part of your plan, which means that activating the feature won't cause megabytes to be suddenly debited unless you have a packet of minutes connected, but the fact of the transfer goes through data channels.
Technically, switching to this standard unloads base stations, allowing operators to allocate frequency resources more efficiently. For Redmi users, this means a more stable signal in crowded areas where conventional networks often suffocate from congestion. The smartphone automatically selects the optimal path for a voice packet, ensuring seamless communication.
Key Benefits for Redmi Users
Using VoLTE on Xiaomi devices offers a number of tangible benefits that improve the everyday experience of using the gadget, primarily the ability to use voice and the Internet simultaneously. Earlier, during a conversation, the Internet connection often broke or slowed down significantly as the phone switched to 3G. Now you can play online games, watch videos or download files in high resolution right during a phone conversation.
The second important aspect is energy efficiency. While it may seem like running 4G continuously consumes more power, VoLTE actually allows the modem to end communications sessions faster and return to sleep, thanks to more efficient signal encoding and no need to constantly switch between different generations of networks (2G/3G/4G) during a single call.
The third advantage is improved coverage inside buildings. The 4G signal used to transmit voice is often better at penetrating walls and floors than the signals of old standards. This is especially true for owners of the Redmi Note series, which are often in offices, shopping centers or apartment complexes with thick walls.
- 📶 Simultaneous operation of voice and high-speed 4G Internet.
- 🔋 More efficient battery consumption due to the absence of constant switching between networks.
- 🎙️ High-definition sound (HD Voice) with improved noise cancellation and natural tone of the interlocutor.
- 🚀 Instant connection to the subscriber, reducing the waiting time of the beeps.
The impact of VoLTE on battery consumption and traffic
Many users mistakenly believe that the VoLTE icon indicates increased Internet traffic consumption. This is a common misconception: voice calls over LTE are charged by operators in the same way as regular minutes. In the billing of the operator, this data is marked with a special flag and does not go into the mobile Internet packets, so fears about fast-ending gigabytes are groundless.
As mentioned earlier, the lack of “jumps” between communication standards (when a phone drops from 4G to 3G on a call and then searches for 4G again) reduces the load on the radio module. However, if 4G coverage is very weak in your region and the phone is constantly searching for the network, the cost may be higher, but this is a coverage problem, not the technology itself.
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If you notice a sharp drop in autonomy after turning on VoLTE, check the power saving settings for the Phone application and make sure that you have a confident 4G signal reception in your zone.
There is a nuance associated with double SIM-On some Redmi models, when you talk actively on one SIM card, the second one can temporarily lose the network or switch to mode. 2G, If VoLTE is not enabled on both cards, this may affect the overall power consumption of the device. SIM-map.
⚠️ Note: In some rare cases, when using the old SIM-maps (issued more than one) 5-7 In case of activation of VoLTE, you may not be able to work properly. If after activation of the function the phone often loses the network or overheats, contact the salon for a free replacement. SIM-new card with support USIM.
How to Enable and Configure VoLTE on Xiaomi and Redmi
Activation of Voice over LTE On Xiaomi smartphones, it usually happens automatically if the operator supports this service and it is connected to your phone. SIM-But in the shells. MIUI And HyperOS sometimes requires manual intervention, especially if you've changed your location or operator, and you're set up through the standard system settings menu.
First, make sure that the mobile Internet is turned on, as switching types of networks is often blocked when the data transfer is turned off. SIM-The path may vary slightly depending on the firmware version, but the logic remains the same. You need to find the section that is responsible for the preferred type of network.
☑️ Check before activating VoLTE
In the menu that opens, select SIM-The card you want to activate the function for. Find a switch called "Use VoLTE" or "Calls through" LTE". Put it in the active position. After that, the status bar should appear the appropriate icon. If the switch is missing or inactive (gray), this may mean that the operator has not certified your device, and activation through the engineering menu is required.
Path to menu: Settings → SIM- Maps and Mobile Networks → (Select SIM) → Use VoLTEIn some cases, especially on global firmware versions for Russia or Ukraine, the menu item may be hidden, so the user has to use the codes of the engineering menu or special applications to activate hidden modem functions, but the standard way through the settings is preferable and safe.
Solving problems: the icon does not appear or burns gray
The situation where the VoLTE icon does not appear, despite the settings enabled, is quite common. Most often the problem lies on the operator side: the service may not be activated on the tariff. Even if the phone supports the technology, the network must "allow" the entry into voice call mode via LTE. You need to call support or check the operator's personal account.
Another common reason is that your Redmi does not support a specific frequency or range in a given region. Smartphones designed for the Chinese market may not have all the necessary certificates to work with Russian or European carriers in VoLTE mode. In this case, the icon may not appear, although calls may pass, or the function will be completely unavailable.
| Problem. | Possible cause | Decision-making |
|---|---|---|
| The badge doesn't show up. | The service is not connected to the operator | Send. USSD-request or write to the support chat |
| The switch is grey. | Absence SIM-card 4G | Replace SIM with new USIM 4G |
| The sound is interrupted. | Weak 4G signal | Getting out of the open or temporarily disabling VoLTE |
| The Internet does not work when calling. | Wrong APN settings | Reset the access point settings to the factory |
It's also worth checking the APN settings. Sometimes manually changing the Internet settings can block the ability to transmit voice traffic over LTE. Try resetting the mobile network settings to factory values. This is safe and will return all operator parameters to their original state.
Engineering menu and hidden network settings
If standard methods fail to enable Voice over LTE, advanced users can use the Android engineering menu, which is a hidden part of the system designed for testing equipment, and on Xiaomi, it is logged in through a set of special code in the Phone application. Be careful: changing unknown parameters can disrupt the radio module.
To enter the test menu, enter the code ##4636##. In the list that opens, select Phone Information. Here you can find the "VoLTE Provisioned" switch. It is activated by force to tell the network that your device is ready to work in this mode. However, this method does not work on all processors (Snapdragon, MediaTek, Exynos behave differently) and can be blocked by the manufacturer.
What to do if the engineering menu code doesn’t work?
There are also third-party apps from the Play Market, such as Force LTE Only (4G/5G), which create a shortcut for hidden settings. They can help if the standard interface hides the option. However, using such utilities requires understanding the risks: the phone may stop seeing 2G/3G network, and in the zone without 4G you will be left without communication.
⚠️ Attention: Forced incorporation of the regime"LTE Only" through the engineering menu can cause complete loss of communication in places where there is no coverage. 4G, As the phone will stop switching to 3G. Use these settings only for testing and do not leave them active all the time.