Xiaomi’s V0 LTE indicator: value and elimination

Xiaomi smartphone users often encounter various symbols in the status bar that can cause confusion, one of them being V0 LTE, which appears instead of the usual 4G or LTE icon, which signals the current mode of operation of the mobile network and is directly related to VoLTE technology.

This sign means that your device has successfully connected to a fourth-generation voice-enabled network, not a bug or a crash, but rather a sign that the SIM card and the carrier’s base stations are properly configured, but many Redmi and POCO owners are wondering if it’s possible to change or disable this mode.

In this article, we will discuss the technical aspects of voice over LTE, explain why the indicator sometimes changes its appearance, and consider the impact of this technology on call quality, and learn how to manage network settings in the MIUI or HyperOS shell to optimize the connection.

Technological basis of the indicator V0

abbreviation V0 in this context is a shortened graphical display of the Voice over standard LTE. Traditionally, voice calls on networks 2G and 3G It was transmitted over switching channels, whereas data was transmitted over packet channels. VoLTE technology allows voice to be transmitted as a normal data stream through a single channel. IP-protocol, which significantly improves the quality of communication.

When you see a V0 LTE icon, it means that the smartphone uses a high-speed 4G channel not only for the Internet, but also for voice communication. Unlike older networks, where when an incoming call the phone could switch to 3G or 2G (CSFB technology), there is no break in the connection with fast Internet.

This mode requires support from three components: the smartphone itself, the SIM card, and the carrier’s equipment. If at least one element does not support the standard, the phone will automatically switch to normal LTE or 3G mode. That is why this icon may not appear at all on some SIM cards or in certain regions.

⚠️ Attention: If the icon V0 LTE If the light is gray or a crossed-out symbol of the Internet appears next to it, this may indicate temporary problems with data transmission, despite the active voice channel.

The key advantage of the technology is fast connection: dialing is almost instantaneous, without the characteristic delay of a couple of seconds that was characteristic of old networks, and the audio codec in LTE networks provides a cleaner and more surround sound interlocutor.

Differences between VoLTE, 4G and 3G

Many users confuse the usual network designation with V0 mode. It is important to understand that LTE is a data transfer standard, and VoLTE is a way of organizing voice communication on top of this standard. A smartphone can show simply "LTE" if the voice call is not currently being performed or if the function is not activated in the settings.

In third-generation (3G/H+) networks, voice and data are transmitted over different channels, which often leads to lower Internet speeds during a conversation. In fourth-generation V0-enabled networks, all streams are combined, which is especially important for those who use a navigator or video concurrently with a regular telephone conversation.

There is also VoWiFi (Voice over WiFi) technology, which works on a similar principle but uses a wireless Wi-Fi network instead of a cell tower. On some Xiaomi models, the indicator can change to Wi-Fi Call if the cellular signal is weak but wireless Internet is available.

Below is a table showing the main differences in the characteristics of the compound:

Configure the VoLTE function on Xiaomi

To activate V0 LTE mode on Xiaomi smartphones, you need to perform several actions in the settings menu. Usually the function is turned on by default if the operator supports the technology, but in some cases manual activation is required. The first step is to make sure that the SIM card supports 4G and the tariff plan allows the use of voice calls over LTE.

Go to the settings menu of your device. Find the connection section. The path may vary slightly depending on the version of the MIUI shell or HyperOS, but the logic remains the same. You need to find the item associated with using 4G networks.

Settings → SIM- Maps and Mobile Networks → Select SIM Card → Use 4G

After you turn on 4G, you should see an additional switch called VoLTE Calls or Use VoLTE. Activate this switch. If you don't see the V0 icon after you reboot your smartphone, you may need to adjust it through an engineering menu or call an operator.

In some regions or custom firmware, the menu item may be hidden, so you can try entering a special code in the call menu, such as ##86583##, to unlock the hidden operator check, and after entering the code, a notification should appear that the VoLTE Carrier check is disabled, which often helps the icon appear.

Effect of V0 mode on battery charge

One of the common questions is power consumption, and it's been said that running in V0 LTE mode is faster than battery drain, and in fact, the current modems in the Snapdragon and MediaTek processors used in Redmi and POCO are quite energy efficient.

When using a VoLTE phone, you don't have to constantly switch between 4G and 3G/2G standards while you're calling, and this "throwing" between towers of different generations consumes significantly more power than running in a stable range, so in the long run, an on-board V0 can even save charge.

However, if the network signal is very weak, the phone will increase the transmitter power to maintain the LTE connection. In areas of uncertain reception, this can really lead to a faster discharge, in which cases the system itself can suggest switching to 3G to save energy.

It is also worth considering that background data synchronization in networks 4G It's faster, which indirectly affects screen time, but the way you communicate through voice is through the screen. IP-The protocol is optimized by operators for minimal resource consumption.

Problems with displaying the V0 icon

Sometimes users are faced with a situation where the function seems to be on, but the V0 icon does not appear, or it appears and disappears, this may be due to the fact that in a particular location of the operator’s coverage, there is no full support for voice calls over LTE, despite the presence of the Internet.

Another common reason is that the SIM card profile is incompatible: Old SIM cards released several years ago may not have the necessary login records for VoLTE, in which case the solution is to replace the SIM card with a new one in the operator’s cabin, which is usually free.

In addition, the global versions of Xiaomi firmware may not have a configuration file for a specific local operator, in which case the icon may not appear, although the function itself will work, and you can check this by making a call and seeing if the Internet speed drops.

⚠️ Warning: If after turning on VoLTE, the sound in the speaker disappeared or calls became intermittent, try resetting the network settings to factory ones in the corresponding menu.

It’s also worth checking if you have a number detector app that might conflict with the telephony system module, and disabling such apps while you’re diagnosing will help identify the cause.

Comparison of operators and support of the standard

In Russia and the CIS, the major operators (the “Big Four”) have long implemented VoLTE support, but the terms of service may differ. Some operators require an additional service or a special tariff, others provide the default technology for all subscribers with a special service. 4G-smartphone.

For example, one operator may have a function that is automatically active for all subscribers with compatible devices. SMS-A third operator may limit support to only certain phone models, adding them to the whitelist".

Xiaomi owners are often more fortunate as it works with carriers to add their devices to compatibility lists, but gray versions of smartphones designed for the Chinese market may have difficulty displaying the operator’s logo or activating V0 in roaming.

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If you travel frequently to regions, make sure that the mobile network settings include the option "Roaming data", otherwise when leaving the coverage area of the home region, the phone may not register with the V0 LTE network of another operator.

Up-to-date information about your tariff and region support is best checked on the operator’s official website, which usually publishes lists of supported devices and activation instructions.

How to turn off V0 LTE on Xiaomi

Despite the benefits, some users may need to turn off this mode, such as if your area’s carrier base stations are overloaded and switching to 3G provides more stable connectivity, or if you want to save battery power in a critical situation.

To turn off, just go back to the SIM card settings menu. Find the VoLTE Calls switch and turn it to the "Switched Off" position. After that, the phone will stop registering for voice calls over LTE and will use standard 2G/3G channels for conversations.

The status bar indicator will change to normal 4G or H+ during a conversation. Internet when calling can be temporarily interrupted or slow down if the device does not support simultaneous voice and data on 3G networks (DSDS technology may have limitations).

Settings → SIM- Maps and Mobile Networks → Select SIM card → VoLTE calls (Off)

If the standard way to disable the function is not possible, you can use the engineering menu by entering the code ##4636## in the phone application. In the "Phone Information" section, you can find the "Turn off VoLTE provisioned" setting, but this method is suitable for advanced users.

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Disabling VoLTE is useful in areas with unstable 4G coverage, where voice communication is more important than Internet speed.

Detailed Questions and Answers (FAQ)