The appearance of an obscure icon on a smartphone screen often causes users to feel mixed feelings, from curiosity to mild panic. Owners of Xiaomi, Redmi and POCO devices often notice a VoLTE symbol in the status bar, which can be located next to the signal level or battery charge indicator. This marker indicates the activation of Voice over LTE technology, which allows voice calls over fourth-generation networks.
This feature dramatically changes the quality of communication, providing crystal clear sound and instant connection. However, not everyone is happy with a constant display that blocks the useful space of the screen. In this article, we will discuss in detail what lies behind this acronym, how to manage its display and why operators are increasingly implementing this standard.
What is hidden behind the acronym VoLTE
Voice over LTE is a standard for voice traffic exclusively over 4G packet data. Before, when you dialed a number, the phone was forced to switch to 3G or 2G mode to make a call, since classic LTE networks were originally designed only for the Internet. Now voice is converted into a digital data stream, which eliminates delays in connection.
The main advantage is that you can use the Internet and voice simultaneously without slowing down. You can play online games or watch high-resolution videos while you're talking to someone, and the network won't switch to slow EDGE or 3G. The sound quality is comparable to instant messengers, but it works through a regular phone book.
This technology requires support from three components: your smartphone, SIM-Xiaomi is actively implementing support for these frequencies in its budget and flagship models, making the technology available to the mass user. It is important to understand that even with an icon, the call can be reset in the future. 3G, If you are in a bad area of coverage 4G.
⚠️ Warning: Activation of VoLTE can lead to faster battery discharge in areas of uncertain signal reception, as the communication module will constantly look for a stable connection. 4G.
How to turn on and off the icon on Xiaomi
Control of the display of the indicator in MIUI and HyperOS is often hidden from the average user. Engineers of the company believed that the permanent icon can be distracting, so by default it can be hidden even if the function itself works. Access to the full settings menu often requires activation of hidden engineering mode through special code.
To access the advanced settings, open the Phone app and dial the combination ##86583##. Once you enter, you should see a pop-up message “VoLTE carrier check was disabled” (or enabled), which confirms that the developer menu has been activated to check operators, and then the desired switch will appear in the standard settings menu.
☑️ Icon inclusion algorithm
If the standard code didn't work or the menu item didn't appear, your carrier might not be certified in the firmware, in which case you can try entering the code ##4636##, selecting Phone Information, and find the "VoLTE Provisioned" switch, which will force the system to know that the service is available.
⚠️ Note: Do not change the settings in the Phone Information menu (code 4636) if you are not sure about your actions, as this may lead to loss of communication.
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If the icon does not appear after the function is turned on, try to restart the device or turn on “Flight Mode” for a couple of seconds so that the network re-requests the parameters.
Comparison of voice transmission technologies
Understanding the generational difference helps to assess the real benefits of innovation: Old standards sacrifice quality for compatibility, while new ones focus on multimedia. Below is a table showing the key differences in voice protocols.
| Characteristics | 2G / 3G (CSFB) | VoLTE (4G) | VoWiFi |
|---|---|---|---|
| Connection speed | 3-10 seconds | 1-2 seconds | 1-2 seconds |
| Sound quality | Low (narrow stripe) | High (HD Voice) | High (depends on Wi-Fi) |
| Internet operation during the call | Just 3G or not. | Full speed 4G | Wi-Fi. |
| Battery consumption | Medium. | Optimal. | Minimum indoors |
As you can see from the comparison, the transition to VoLTE brings a tangible increase in comfort, especially in densely built areas where 4G is loaded and 2G/3G channels can be clogged or absent, but in a deep basement or village, the good old 2G is sometimes more reliable for simple voice calls.
Setup of communication operators in Russia and CIS
The largest operators, such as MTS, MegaFon, Beeline and Tele2, It's been supported for a long time, but the automatic profile setting may not work if you're using the old one. SIM-map or region where coverage 4G In most cases, the service is free, but it's charged according to your plan.
Often the problem is that Xiaomi’s Global ROM firmware doesn’t have any configuration files for local carriers, so the icon might not appear, although the connection will work. The solution is to flash the phone to the China version and then install Google services, but it’s a tricky path for power users.
What if the operator does not support VoLTE?
To activate the service, sometimes you need to send USSD-request or contact the salon for replacement SIM-new card with support USIM. Older Mini-SIM cards physically cannot provide the necessary security and data exchange speed for VoLTE.
Why the icon may disappear or not work
A situation where the VoLTE indicator appears and disappears is normal for areas of unstable coverage. A Redmi or POCO smartphone automatically switches to 3G if the 4G signal becomes too weak to provide a voice channel, which protects you from interrupting the conversation.
Another reason could be a software update, and after the MIUI update, network settings can reset to factory settings where the default feature is disabled, and it’s also worth checking whether Traffic Saving or Modem Modem mode is activated, which sometimes block the priority of voice packets.
⚠️ Attention: When using two SIM-Both cards can only work simultaneously if the phone and processor support the technology. DSDS (Dual SIM Dual Standby in mode 4G.
Impact on communication quality and battery
Many users mistakenly believe that the permanent icon 4G and VoLTE quickly land the battery. In fact, modern modems in Snapdragon and MediaTek processors consume less power with a stable LTE connection than with a constant jump between 2G, 3G and 4G in search of a network.
The main energy expenditure is when you set up a connection, and because VoLTE reduces the dial time to 1-2 seconds, the overall energy balance can even improve during the day, but if you're at the edge of coverage, where the phone is cramping to catch 4G, the charge consumption will actually increase.
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A stable 4G signal with VoLTE is more cost-effective for the battery than constantly searching for a network in low coverage.