What does HD on the phone when calling Xiaomi: we analyze the technology and settings

Introduction: Why Xiaomi’s screen will have an HD sign on it during a call

Have you ever noticed a small sign on your Xiaomi screen while calling? HD This tag is not just a sign that you're calling, it's a signal that you're calling using high-definition voice technology (HD But what does that mean in practice, how does it work in the Xiaomi ecosystem, and why sometimes? HD-In this article, we will analyze all the nuances, including hidden settings. MIUI, Operator requirements and possible problems.

First, we need to clarify: HD-Calls are not marketing, but real-world technology that improves voice quality through a wide range of frequencies (up to 7 kHz vs. the standard 3.4 kHz), which means that under the right conditions, you will hear the person talking to you as if they were nearby rather than on the phone. However, there are nuances: not all Xiaomi models support this feature, and carriers do not always activate it by default. HD Voice on your device and what to do if the technology doesn’t work.

What is it? HD-The call and how it works for Xiaomi

HD Voice (or VoLTE HD) is a communication standard that uses a 4G LTE network to transmit voice instead of the outdated 2G/3G.

  • 🎤 Wide frequency range: 50 Hz to 7 kHz (versus 300-3400 Hz in standard calls), making voice more natural.
  • 📶 Less noise: technology suppresses background sounds (wind, street hum) thanks to improved codecs.
  • ⚡ Fast connection: the call is set for 1–2 seconds against 5–10 second-in-second 2G/3G).
  • 🔄 Smooth transition: if the signal 4G The call is automatically switched to 3G without a cliff (with operator support).

On Xiaomi smartphones HD-Calls are made using VoLTE (Voice over) protocol LTE), It's important to understand that in order to activate the device, it's important to activate the device. HD Voice must meet three conditions:

  1. Device support: Not all Xiaomi models (especially budget or Released models until 2018) are equipped with the right modem.
  2. Operator activation: Even if the phone supports VoLTE, the carrier must provide this service (free of charge or for a fee).
  3. Network coverage 4G: HD-Calls only work in stable reception areas LTE.

If at least one of the conditions is not met, the HD inscription on the screen will not appear, and the call will go according to the standard protocol.

📊 Your operator supports you. HD-calls (VoLTE)?
MTS
Beeline
MegaFon
Tele2.
Yota
Other
I don't know.

What Xiaomi models support HD-calls (VoLTE)

Xiaomi’s list of VoLTE HD compatible devices is constantly expanding, but there are key points:

  • 📱 Flagship Series (Xiaomi) 12/13/14, Mi 10/11, Black Shark supports VoLTE out of the box on all firmware.
  • 💰 Mid-size segment (Redmi Note) 10/11/12, POCO X3/X4/X5) — Support depends on the region and version MIUI.
  • 🔴 Budget models (Redmi) 9A/10A, POCO M3/M4) VoLTE is often deprived in some countries (for example, in Russia it can work, but in India it does not work).

To know if your Xiaomi is supported HD-Calls, follow the following steps:

  1. Open the Settings. → SIM-maps and mobile networks.
  2. Choose yours. SIM-map.
  3. Check for VoLTE or Improved Calls.
  4. If you have an option, turn it on. If you don't, it doesn't support the technology.

You can also use the GSMArena database: enter your Xiaomi model and check the Network section for the VoLTE mark.

☑️ Verification of VoLTE support on Xiaomi

Done: 0 / 4

How to turn on HD-calls on Xiaomi: step-by-step instructions

If your device supports VoLTE HD but does not appear HD when calling, follow this instruction:

  1. Activate VoLTE in Settings: Go to Settings → SIM-maps and mobile networks → [choose SIM] → VoLTE. Turn on the switch. If you don't have an option, update. MIUI last-minute.
  2. Check operator settings: Some operators (such as MegaFon or Beeline) require sending USSD-You can check the command on the operator's website. Example for MTS: dial *111*55# and follow the instructions.
  3. Update your firmware: Go to Settings → About Phone → Update your system and install the latest patches. Sometimes VoLTE only activates after you update your radio module (not to be confused with regular software!).

Reset your network settings (if nothing helps):

  • Go to Settings. → SIM-maps and mobile networks → Resetting network settings.
  • After reset, restart your phone and re-enable VoLTE.
Why on time? HD-The bell goes down fast?
VoLTE uses the use of 4G-A modem that consumes more energy than a 2G/3G. To reduce the cost: Turn off background data for other applications during the call. Activate the power saving mode in the settings (Settings) → Battery → If the battery is running down critically fast, check its health in Settings → Battery → Battery status.
Can I use it? HD-roaming?
Yes, but with reservations: Both operators (your and local) must support VoLTE roaming.In some countries (e.g. Turkey or UAE) HD-Calls may be blocked due to local regulations.Clarify rates: some operators write off VoLTE roaming calls as international.
How to turn off HD-Calling Xiaomi if you don’t need it?
If you want to go back to standard calls: Go to Settings → SIM-maps and mobile networks → [yours SIM] → VoLTE. Turn off the switch. Reset the phone. Then the calls will go over the networks. 2G/3G, lettering HD disappear.
Is it true that HD-Calls improve communication quality in places with poor signaling?
No, it's quite the opposite. VoLTE requires stable. 4G-If the signal is weak: The call may stop or switch to 3G. Voice quality will deteriorate due to batch losses. 3G If you make frequent calls in areas with poor coverage (such as the subway or outside the city), you'd better turn off VoLTE.

💡

HD-Xiaomi calls (VoLTE) work only when three conditions coincide: device support, operator activation and stable. 4G-If at least one of them is not fulfilled, the inscription HD There will be no screen appearances.