How to make the Internet work when calling Xiaomi Redmi

The situation when during a voice call on a Xiaomi or Redmi smartphone, mobile Internet is interrupted, is familiar to many users. You are talking on the phone, but you can not send a message in the messenger, check your email or look at the navigator, since the network indicator switches from 4G to 3G or even E. This is not a defect of a particular device, but is due to the peculiarities of the cellular networks and the settings of your operator.

The main reason is data technology: standard voice calls often use older protocols that can’t run parallel to high-speed internet on a single frequency. To solve this problem, you need to activate VoLTE (Voice over LTE), which allows voice to be transmitted as a data stream through a fourth-generation network. In this article, we’ll detail how to set up a smartphone to keep the Internet active at the moment of the conversation, and what to do if standard methods do not help.

Why the Internet is lost during a conversation

The technological gap between voice and data has historically been that voice has used 2G and 3G channels, and the Internet has been distinguished by LTE. When you receive or make a call, the phone forcibly switches the radio to voice-supporting frequencies, interrupting the connection to fast Internet, a phenomenon particularly noticeable in regions where 4G coverage is not yet solid.

However, modern smartphones, including the popular Redmi Note and Xiaomi Mi models, are equipped with modules that can work in CSFB (Circuit Switched Fallback) mode or, ideally, VoLTE. If you do not have Internet when calling, this means that either your operator does not support this feature in your region, or the phone’s settings have chosen an incorrect network type. Often users limit the device’s capabilities by choosing 3G Only mode to save charge.

It’s important to understand that stable performance requires support from all three parties: your smartphone, SIM-If at least one element of the circuit does not meet the requirements, the phone will automatically up to the older communication standard.

⚠️ Note: In some older Redmi models or when using outdated ones SIM-maps (issued more than one) 5-7 VoLTE technology may not be physically supported, in which case the replacement SIM-The operator often solves the problem.

Activate VoLTE via the standard menu

The easiest and safest way to get the internet running in parallel with a conversation is to enable VoLTE in your system settings. This option is present in the MIUI shell and the new HyperOS, but sometimes it is hidden or not activated by default. First, make sure that your plan supports this service (usually it is free, but you need to connect).

Go to the settings menu of your device. Find the mobile section. The path may vary slightly depending on the firmware version, but the logic remains the same. You need to find the item related to using 4G networks for voice calls.

• 📱 Open Settings and select SIM-maps and mobile networks.
• 📶 Click on the SIM card number you most often talk through.
• 🔘 Find the switch Use VoLTE or Calls through LTE and activate it.
• 📞 Make sure that the "Network Type" value is selected 4G (LTE).

After this function is enabled, a VoLTE icon should appear next to the signal level indicator or HD. This means that the phone is ready to transmit voice over the Internet channel. If the icon does not appear, try to restart the device or reset the device. SIM-card to another slot, as on some Redmi models the first slot is more priority for working with the first slot. 4G.

Hidden settings and engineering menu

If the standard switch is missing or not working, you can use the Android hidden engineering menu, which is a powerful tool for diagnosing and fine-tuning the radio module, but requires caution, and here we can force you to specify the preferred network type that will allow you to save LTE during the call.

To enter the phone's settings menu, dial a special number in the dialer code. Most Xiaomi devices run code ##4636##. If it doesn't work, try ##86583## to force region check on, which sometimes opens up hidden features.

##4636##

Once you enter the code, the "Verify" menu will open. Select Phone Information. In the list that opens, find the drop-down menu "Configure preferred network type." Here you select a value that contains LTE and GSM (or WCDMA), such as LTE/TD-SCDMA/GSM or LTE Only. Beware: choosing "LTE Only" mode may cause you to stop taking calls if VoLTE is not set up perfectly, as the phone will stop seeing 2G and 3G networks.

⚠️ Warning: Changing the parameters in the engineering menu can lead to unstable communication. If the signal or the Internet is lost after the changes, return the value to the original state (usually signed as default) or reset the network settings.

Setting up an APN access point for stability

Sometimes the problem is not the type of network, but the wrong APN settings. If the access point settings are outdated or have errors, the phone may misdirect data traffic during a voice call, and checking these settings is an important diagnostic step.

Go to your mobile network settings and select "APNs." Click on the menu (three dots in the corner) and select "Reset to Default." This action will return your operator's factory settings, which are the most optimal. If that didn't work, you can create a new access point manually, you take the actual data from the operator's website.

The table below shows an example of APN settings for popular carriers that often help restore connection stability:

Influence of region and firmware version

Xiaomi users often find that VoLTE is not available on global firmware versions (Global ROM) for certain regions, although it works on Chinese versions (China ROM), which is due to the certification of equipment for specific carriers in different countries.

If you bought a phone designed for the Chinese market and installed global firmware, the functionality can be reduced, in such cases, changing the region in the phone settings helps. Go to Settings → Advanced Settings → Region and select a country where your carrier officially supports VoLTE (for example, India, Russia or countries in Europe).

It’s also worth checking for system updates. Xiaomi engineers regularly release patches that improve compatibility with local carriers. Go to Settings → About the phone and click on the MIUI version. If an update is available, install it – this can add missing carrier profiles.

Alternative solutions and third-party applications

If you can’t use the same system to activate voice and the Internet, you can use third-party apps from the Google Play Store to manage your radio settings more flexibly than a standard Android menu.

One popular solution is Force LTE Only, which allows you to switch modes of operation in one click, but it is worth remembering that such applications require permissions to use special features, which must be granted through ADB or special menus.

• 📲 Download the network management application from a reliable source.
• 🔐 Provide the necessary permissions through the special features menu.
• 🔄 Select a mode. LTE Only for the duration of an important conversation, if the standard mode does not hold the network.
• 📉 Remember, you're on the move"LTE Only" incoming calls may not pass unless VoLTE is configured.

Another option is to use messengers (WhatsApp, Telegram, Viber) to make Internet calls, in which case the Internet will not shut down, because the call is through the data channel, which is a workaround, but it requires that the interlocutor also has an app installed and the Internet is active.

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The most reliable way is to contact the operator to activate the VoLTE service on the network side, since without the support of the base station, the phone settings are powerless.

Frequently Asked Questions (FAQ)