VoLTE technology on Xiaomi Redmi 9C: the full guide

Owning a modern smartphone like the Xiaomi Redmi 9C means access to advanced mobile technologies, among which VoLTE is a special place. Many users encounter this icon in the status bar, but do not always understand its practical value for everyday communication. This feature radically changes the quality of voice communication, bringing it to a new level of purity and stability.

In this article, we will explain in detail what exactly lies behind this acronym and why Redmi 9C owners should pay attention to this, learn how to activate the mode, what benefits it provides when talking over a 4G network, and what to do if the desired option is not displayed in the settings menu.

Understanding how voice calls work over LTE will help you make the most of your device, and we’ll look at the technical aspects, the impact on battery power, and carrier compatibility to give you a complete picture.

The essence of the technology Voice over LTE

VoLTE stands for Voice over LTE, which literally means Voice over LTE. Traditionally, mobile networks used different standards for data and voice: 4G (LTE) was designed exclusively for high-speed Internet, and for conversations the phone switched to older 2G or 3G standards. VoLTE technology allows voice streaming as normal Internet data within a fourth-generation network without requiring a mode switch.

The main difference is that the voice is encoded in IP-packets and transmitted through the channel LTE It's a high-speed thing. HD-Sound quality that far exceeds the capabilities of older networks. - Xiaomi Redmi owner 9C This means that the voice of the interlocutor will sound natural, without the characteristic distortions and “robotic” timbre, characteristic of narrowband communication.

⚠️ Attention: To work the function requires support of technology not only from the smartphone, but also from your operator, as well as the presence of the technology. SIM-maps of the relevant standard.

Also, the important advantage is the simultaneous operation of voice and the Internet. In older networks, when an incoming call, the Internet often turned off or the speed dropped to a minimum, as the device went into 3G. With active VoLTE, you can continue to download files, navigate maps or play online games while you talk on the phone using full 4G speeds.

Key Benefits for Redmi 9C Users

Using Voice over LTE on Redmi devices offers a number of tangible benefits that improve the user experience, particularly in terms of the quality of the audio stream, which is wider and cleaner, especially when talking in noisy places or when the interlocutor is in an unstable area of reception.

Another important aspect is the connection speed: the connection time (from the moment you press the call button to the beeps) is reduced by many times. Whereas in 3G networks the wait could take 5-7 seconds, in LTE the connection happens almost instantly, in 1-2 seconds, which saves time and nerves, especially when making emergency or short calls.

Also worth noting is the impact on autonomy: Although 4G data transfer consumes energy, the absence of the need to constantly switch between 3G and 4G modes during a conversation allows you to optimize battery consumption.

• 📶 High speed of connection with the subscriber.
• 🔊 Crystal clear sound in format HD Voice.
• 🌐 Simultaneous operation of fast Internet and voice communication.
• 🔋 Optimized energy consumption due to the absence of frequent network reconnections.

How to activate VoLTE on Xiaomi Redmi 9C

The feature on Xiaomi’s smartphone is usually enabled automatically if the operator supports the technology and inserts the appropriate one. SIM-However, in some cases, manual activation is required through the settings menu. First, make sure that coverage is available in your area. 4G Your plan allows you to use this service.

To check the settings, go to the Settings section, then select the item SIM-Maps and mobile networks. You need to choose active networks. SIM-In the menu that opens, find the Use VoLTE or Preferred Network Type switch and make sure that mode is selected. 4G (LTE).

If there is no standard switch on the menu, it may mean that the function is hidden by the provider or activated by default, in which case you enter the engineering code in the Phone application. The combination set ##86583## (code can vary depending on the version of MIUI) sometimes allows you to force the hidden VoLTE Carrier Check setting to be turned on or off.

⚠️ Warning: Use of engineering codes requires caution, changing unknown parameters can lead to unstable operation of the communication module.

Compatibility with operators and SIM-map

Successful VoLTE operation on Redmi 9C The largest providers in most countries have already implemented support for this technology, but the conditions may vary: some operators require special registration of the service, others activate it automatically for all subscribers from the mobile operator. 4G-tariff.

It is important to bear in mind that SIM-The map must be of a new pattern (USIM), Old cards you used back in the era. 3G, may not support the necessary encryption and authentication protocols for voice transmission LTE. In this case, a replacement will be required. SIM-cards in the communication room, which is often done for free.

It is also worth noting that when using two SIM-maps in Xiaomi Redmi 9C, VoLTE technology can work simultaneously on both, if the device processor and firmware version allow it. In older models, activation of VoLTE on the second SIM card could block the device. 4G in the first but in the modern versions MIUI This problem is solved.

Solution: The badge doesn't appear

A common situation is that there is no VoLTE or HD icon in the status bar even after all settings are turned on. This does not always mean a malfunction. First of all, check if you are in a zone of confident 4G reception. If the phone switched to 3G due to a weak signal, the technology will not work.

The second reason could be a software failure in the network module, which is to try to reboot the device or turn on and off In-Flight mode, which will force modem to re-register and update the list of available services.

If the icon appears but calls are disrupted or go through 3G, it may be the carrier-side problem. Make sure the service is not blocked in the subscriber's personal account. Also check for system updates in the About Phone section, as Xiaomi regularly releases patches that improve compatibility with local carriers.

Impact on autonomy and productivity

There is a myth that running 4G and using VoLTE significantly land the battery. In practice, for the Xiaomi Redmi 9C with its capacious battery, the impact is minimal. As mentioned earlier, the lack of jumps between 2G/3G/4G networks during the call even saves life.

However, if you are in a border area where your phone is cramping for LTE, your energy consumption can actually increase, and in such situations it is wiser to temporarily switch the network type to 3G, preferably if voice quality is more important than internet speed.

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For maximum power savings in low signal areas, manually disable 4G/LTE, leaving only 3G. This will speed up network search and extend battery life.

Processor and RAM performance when using VoLTE is also not affected. processing of voice packets falls on dedicated DSP-modules without loading the main cores of the system, so background applications and games work in normal mode.

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VoLTE is a communication quality standard that should work out of the box with operator support, without requiring complex user settings.

Frequently Asked Questions (FAQ)