HD icon on Xiaomi phone: decryption and configuration

Owners of Xiaomi, Redmi and Poco smartphones often notice the appearance of a small but noticeable icon. HD And it's at the top of the screen next to the network indicator, and for many users, it's a cause for concern or joy, but not everyone really understands what the acronym is. This symbol indicates that your gadget has moved to a qualitatively new level of voice communication, using modern technologies. LTE-network.

The appearance of this icon means the activation of Voice over LTE technology, which allows you to transfer voice calls directly through 4G channels, bypassing the switch to outdated 2G or 3G standards. This is not just a marketing “chip”, but a real improvement in the quality of communication, which provides crystal clear sound and significantly speeds up the connection with the subscriber.

In this guide, we will discuss in detail the technical aspects of this function, explain the difference between the two. HD-call and video call, and also provide step-by-step instructions for turning on and off this option in the shell MIUI You will learn why the icon can sometimes disappear and what to do if your carrier does not support this technology in your region.

Technological basis: what is hidden behind the abbreviation

To understand the phenomenon, we need to look at the evolution of mobile networks. 2G and 3G, They had a limited frequency range, which made the sound muffled and metallic. LTE) It changes the way you look, by packing your voice into IP-And then you can send it over a fourth-generation high-speed channel, and that's what the icon labels. HD Voice on your device screen.

The key advantage is that there are no delays in switching modes. Previously, when you took a call while you were using the Internet, the phone would force you to reset to 3G or even EDGE, interrupting the loading of pages or video stream. In HD, the Internet continues to work at a top speed of 4G/4G+, allowing you to simultaneously talk and download files without loss of quality.

It is important to note that for the correct operation of the technology requires support from three components: the smartphone itself, SIM-If at least one element of the chain does not meet the requirements, the icon will not appear, and the call will be made according to the classical scheme.

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Make sure you're on yours. SIM-card activated service 4G/LTE. In some cases, this requires replacing the old SIM-cards for a new one in the operator’s cabin, even if the phone supports high speeds.

Differences HD-Calls from video and instant messengers

Often users confuse the HD icon with the video calling function, but there is a fundamental difference between them: video communication (VT) involves the transmission of a video stream in real time and requires a much wider data channel. HD sign speaks exclusively of high audio quality, even if you do not use the camera during the conversation.

It is also important to distinguish between native HD-Operator calls and calls through Internet applications such as WhatsApp, Telegram or Viber. In applications, the sound quality depends on the current speed of the Internet connection and the compression algorithms of a particular messenger. HD In the status bar, Xiaomi indicates the work of the standard phone book and the “caller” integrated into the Android system.

Below is a table showing the main differences between voice technologies:

Benefits of using VoLTE technology on Xiaomi

Transition to use HD-Voice brings a number of tangible benefits to the user of Xiaomi smartphone, which improve the everyday experience of the device, primarily in terms of speed of connection. The waiting time for beeps is reduced several times, which is especially valuable in situations where you need to quickly contact the interlocutor.

The second important aspect is the simultaneous transmission of voice and data. For today's users, who often use a navigator, check email or browse through social media feeds, this is a critical feature. You no longer have to choose between a conversation and an online map.

The third factor is energy efficiency. While it may seem that working on a 4G network consumes more energy, in practice, modem running in VoLTE mode is less “throwing” between towers of different standards (2G/3G/4G), which ultimately has a positive effect on the autonomy of the device in standby and conversation mode.

• 🎙️ The sound becomes volumetric and natural, the effect of the “metal” voice disappears.
• ⚡ Instant connection with the subscriber without long pauses before the first beep.
• 🌐 The Internet does not interrupt or slow down during an incoming or outgoing call.
• 🔋 More efficient battery consumption thanks to stable connection to one tower.

⚠️ Note: Network coverage in some regions 4G It can be unstable, if you're in a bad reception zone. LTE, The phone can often switch between 4G and 3G, This will cause the battery to run out quickly. HD Better to temporarily disconnect.

Step-by-step: how to turn HD on Xiaomi

Activation of high-quality voice function on Xiaomi, Redmi and Poco smartphones usually occurs automatically if the operator supports the technology and profile. SIM-However, in some cases, manual intervention is required through the engineering menu or system settings.

First, make sure that the preferred network type is selected in the mobile network settings. 4G. Go to the settings menu, select the item «SIM-maps and mobile networks, then click on the SIM card and find "Preferred network type." LTE or 4G.

If the icon doesn't appear, you may need to activate the hidden switch. Open the Phone app and dial ##86583##. The screen should show the message "VoLTE carrier check was DISABLED" (or ENABLED, depending on the current state). Re-enter the command to change status. After this procedure, restart the device.

Once turned on, check the status at the top of the screen. If the HD icon doesn't appear, try making a test call. Sometimes the indicator only lights up when you connect. Also make sure that the APN settings don't have the old settings that block voice over LTE.

Why HD icons may disappear or not appear

The lack of an indicator or its periodic disappearance can be caused by a number of technical and software limitations, most often the problem is that your mobile operator has not yet deployed the VoLTE infrastructure in the specific area where you are, in which case the phone automatically switches to 3G to make a call.

Another common cause is outdated firmware or malfunctioning of the communication module. MIUI shell sometimes contains errors in modem drivers that are fixed in security updates. Also, the icon can disappear if you are on the move and network coverage is unstable, causing the phone to constantly look for the best tower.

And the physical side of the question, whether it's damaged or too old, is also important. SIM-The card may not support the necessary encryption protocols for HD-In this case, even the most modern Xiaomi will not be able to display a high-quality icon.

• 📡 Weak signal from the network 4G current location.
• 🚫 The operator does not provide VoLTE service for your tariff.
• 💾 Errors in the phone software or an outdated version MIUI.
• 💿 SIM-The card does not support standards 4G or physically damaged.

⚠️ Warning: Do not try to change the values in the Engineering Mode unless you are sure of their purpose. Incorrect setting of the radio module parameters can lead to a complete loss of communication, which can only be restored by flashing the device.

The impact of the setting on traffic consumption and battery

There is a common myth that HD-Calls eat up gigabytes of mobile traffic. That's not true. Voice packets in VoLTE are very small and are typically charged by carriers as normal minutes of conversation, not as Internet traffic. Your balance of minutes is spent according to the plan.

So, in terms of energy consumption, there's two things going on here. 4G On the other hand, the lack of constant switching between the communication standards (handover) reduces the load on the processor and the radio module. HD-The regime is even more economical than the classical.

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VoLTE does not consume Internet traffic in the usual sense, minutes are charged at the usual rates of voice communication, and not as megabytes of data.

If you notice that the phone has become discharged faster after the HD icon appeared, analyze the quality of the coverage in your area. It may be that the device is constantly on the border of 4G and 3G coverage zones, which causes the antenna to work in high mode, in such a situation it is wiser to switch to 3G manually.

For a detailed analysis of energy consumption, you can use the built-in statistics. Go to Settings → Battery → Consumption and see what percentage the Mobile Network takes. If the value exceeds 15-20% with moderate use, it is worth checking the network settings.

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