Xiaomi smartphone owners often see strange characters at the top of the screen that can confuse an inexperienced user. One of these indicators is the word VoLTE, which appears next to the signal level of the network. Many people perceive this as a sign of connecting to Wi-Fi or activating some paid service, but in fact it is much simpler and more useful for communication quality. This is a technology for voice calls over fourth-generation networks, which radically changes the quality of conversation.
The appearance of this icon on your Xiaomi Redmi or POCO indicates that the device has successfully registered with the operator network that supports this standard, which means that during an incoming or outgoing call, the Internet connection will not switch to slower 3G or 2G, but will remain at high speeds of 4G. As a result, you get crystal clear sound and the ability to use the navigator or messengers right during a conversation without losing connection.
However, even if your phone technically supports this feature, the icon may not burn for a number of reasons, depending on both the firmware and the operator settings. Owners of devices with a MIUI shell or a new HyperOS sometimes observe that the option is hidden in the menu or is unstable. In this article, we will discuss in detail what lies behind this acronym, how to force activate the mode and what to do if the icon disappears after the system update.
Technological essence of VoLTE and benefits for the user
VoLTE stands for Voice over. LTE, Which literally translates as “the voice through the LTE». Traditionally, mobile networks were divided into two types: batch (for the Internet) and switch (for voice calls). When you called using the usual protocol, the phone temporarily switched from the fast. 4G c older and slower 3G or 2G, VoLTE technology eliminates this need by allowing voice to be transmitted as a normal data stream through the Internet protocol. IP net LTE.
The main advantage for the owner of Xiaomi is the speed of the connection. The call set time is reduced from 6-7 seconds to 1-2 seconds. You press the call button, and the beeps are heard almost instantly. In addition, the sound quality becomes HD-quality, the background noise disappears, and the voice of the interlocutor sounds volumetric and natural, this is achieved by using a wider bandwidth and modern audio compression codecs.
⚠️ Note: Using VoLTE can slightly increase battery consumption in areas of uncertain reception, since the communication module operates in a constant data transfer mode. LTE Barely catches, it is better to temporarily disable the function to save energy.
Another important aspect is the ability to use voice and data simultaneously. In older networks, when an incoming call was made, the Internet fell or slowed down severely, interrupting page loading or navigation. With VoLTE enabled on your Redmi Note or Mi, you can safely watch high-resolution videos, play online games or use cards while you talk. Internet speed does not decrease, since voice traffic takes priority, but does not block the data channel.
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For maximum sound quality, make sure the phone speaker isn’t covered with a case with thick edges that can resonate when played. HD-audio.
Verification of compatibility of the smartphone and the operator’s SIM card
Before looking for settings in the menu, make sure your hardware and SIM card are physically capable of supporting the technology.Not all Xiaomi models released a few years ago have the necessary hardware modules or are certified by carriers to work in this mode. It is also important that you SIM-The card was a new sample and registered in the network of the operator with VoLTE support.
Modern Xiaomi smartphones, starting with the Redmi Note 8 series and later, as well as all flagship Mi and POCO models, are generally fully compatible. However, if you use a device imported from China (Global ROM or CN Version), it can be difficult to firmware carrier profiles, in which case the phone can technically support the standard, but software to block its activation for specific regions.
As for SIM cards, most major carriers automatically transfer subscribers to new plans with VoLTE support. If your SIM card is very old (released more than 5-7 years ago), it may have to be replaced in the salon. Operators often change them for free, as it is also beneficial for them to offload 2G and 3G networks.
You can use an engineering menu or special codes to check support status, but the easiest way is to contact the operator or check the information on the official website. There are usually lists of compatible phone models. If your Xiaomi model is not on the list, this does not mean that the feature will not work, but there will be less guarantees of stable operation.
Instructions for enabling VoLTE in MIUI and HyperOS settings
Activation of the feature on Xiaomi smartphones usually occurs automatically if the operator supports the technology and the profile is loaded into the system. However, if the icon does not appear, you need to check the settings manually. The path to these may vary slightly depending on the version of the MIUI shell or HyperOS, but the logic remains the same.
First, open the main settings menu for your device. Find the wireless section. In newer versions of firmware, it's often called the "wireless" section «SIM-Select the SIM card you want to enable (if there are two, set each separately) and then look for a switch called "Use VoLTE" or "Calls on VoLTE". LTE» and activate it.
☑️ The VoLTE Incorporation Algorithm
If there is no standard switch on the menu, you can try activating the function through the engineering menu. To do this, open the Phone app and enter the code # # #86583##. The notification that appears should say "VoLTE Carrier check was DISABLED" (or ENABLED, then you need to press again to turn off the check). After this manipulation, a previously hidden switch should appear in the usual settings.
In some cases, especially on global firmware versions for China, you may need to change your region. Go to Settings → Additional settings → Region and select a country where your carrier accurately supports VoLTE (for example, India or Russia, if you are there).
| Action. | The way is on the menu | The result |
|---|---|---|
| Standard incorporation | Settings → SIM-map → VoLTE | Activation through the interface |
| Engineering code | Caller. → ##86583## | Removal of operator lock |
| Change of region | Settings → Additional → Region | Unlocking Hidden Functions |
| Resetting settings | Settings → About the phone → Reset | Return to the factory parameters of the network |
Why the VoLTE icon disappeared after the system update
A common problem for Xiaomi users is that the VoLTE icon suddenly disappears after a firmware update, which may be because the new version of MIUI changed its Carrier Config configuration files, which could have “forgot” your operator or found it incompatible by automatically disabling the function.
It can also be a radio malfunction, and after a major upgrade, it takes time for the system to re-register and calibrate the parameters, sometimes it helps just to switch flight mode or reboot the device, and if that doesn't work, try removing and adding the SIM card again in the settings so that the phone reads the network parameters again.
⚠️ Note: It is not recommended to install custom firmware or modified versions MIUI It's often the original modem drivers that are cut out in these builds, which causes VoLTE loss and unstable signal.
Another factor is the operator's own actions, and sometimes the providers do technical work or change frequencies, which causes the phone to stop seeing the VoLTE network, in which case it is worth waiting for a few hours or contacting the operator's technical support to check if there are problems on the side of the towers.
If nothing works, you can try manually prescribing the APN hotspot settings, although VoLTE rarely requires this. Go to the mobile network settings, select your SIM card, look for APNs, and check if the APN IPv4/IPv6 type is there. Sometimes changing the protocol type helps restore the connection.
Hidden commands for network diagnostics
Differences between VoLTE and Wi-Fi Calling and 3G Calling
VoLTE is often confused by other technologies, VoWiFi (Voice over Wi-Fi), although both technologies transmit voice over Wi-Fi. IP-protocol, they use different channels. VoLTE runs through cell phone towers (4G), Whereas VoWiFi uses your home or public Wi-Fi connection, the icon is also different: Wi-Fi Calling usually displays a handset with a Wi-Fi symbol.
Compared to regular 3G calls, VoLTE technology delivers significantly better sound quality and connects subscribers faster. In 3G networks, voice is transmitted over narrow bandwidth channels, making voice "metallic" and deaf. LTE allows for a wide range of frequencies, making speech lively and natural.
It's important to understand that VoLTE and VoWiFi can work simultaneously if the phone and the carrier support it. The priority is usually given to the signal that is stronger at the moment. For example, if you walk into a building with a bad cellular signal, but there's Wi-Fi, the phone can switch to VoWiFi so that you don't interrupt the conversation.
- 📶 VoLTE: Works through the network 4G The operator requires a good coverage LTE, No Internet traffic (usually).
- 📡 VoWiFi: Works through a Wi-Fi router, ideal for basements and cottages, can use Wi-Fi network traffic.
- 📞 3G/2G: Outdated standard, slow connection, inability to fast Internet during a conversation.
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The main difference is that VoLTE replaces the old telephone network, and is not an application for calling over the Internet like WhatsApp or Telegram.
The effect of the function on traffic consumption and battery charge
One of the most common questions is about charging, and many people fear that turning on VoLTE will start to "eat" gigabytes from the main package of the Internet. We hasten to reassure you that voice calls via VoLTE are charged by operators as normal voice minutes, not as Internet traffic. Package of minutes is consumed as standard, even if technically the call is via LTE.
On the battery charge side, the situation is ambiguous: on the one hand, not constantly switching between 4G and 3G during a call can save energy. On the other hand, if the LTE signal is weak, the phone will spend more resources on holding it, which will lead to faster discharge. In a confident reception, the power difference between VoLTE and a regular call is almost invisible to the user.
On Xiaomi devices with large screens and powerful processors, the impact of VoLTE on autonomy is minimal. However, if you notice that the phone warms up during a conversation or quickly sits down, try temporarily disabling the feature and comparing the result. Perhaps in your region, the 4G network is not optimized for voice calls.
Solving common errors and connection failures
If the icon is on, but calls don't go through or fail, the problem may be network settings. Try resetting your network settings. This won't delete your personal data, photos or contacts, but will return your Wi-Fi, Bluetooth and mobile settings to factory values. → Connection and sharing → Reset Wi-Fi, mobile networks and Bluetooth.
Sometimes conflict arises because of installed optimizer applications or "cleaners" that aggressively manage energy savings: They can block the background operation of phone services required for VoLTE. Check the boot list and allow system services to work in the background without restrictions.
⚠️ Note: If after all the manipulations, the phone stopped seeing the network or icon SIM-The card is completely gone, the modem's software block may have been damaged, and in this case, only flashing the device through the computer using the Mi Flash Tool utility will help.
Also check if the phone is static. IP-address or DNS, If you have previously set up the network manually, it is recommended to use automatic settings for VoLTE to work (DHCP), The operator’s servers must set the right parameters for voice traffic.