Dual 4G Mode on Xiaomi Redmi: A Complete Guide to Setup and Use

If you own a Xiaomi Redmi smartphone with two support SIM-I think you probably have the term “Dual”. 4G» This feature allows you to use two nano-SIMs simultaneously with support 4G, But not all users understand the features of the system, unlike the standard mode, where the second mode is the second mode. SIM only works 2G/3G, Dual 4G Provides high speed Internet on both maps – but with important nuances.

In this article, we will explain in detail what is Dual. 4G Xiaomi Redmi, which models support it, how to set up the mode correctly, and in which cases it is better to turn it off. Also, you will learn about the hidden limitations of the technology, which the manufacturer does not always advertise, and get practical tips for optimizing the work of the two companies. SIM-map.

We will pay special attention to the issues of compatibility with telecom operators in Russia and CIS countries, since not all providers work correctly with this function. If you travel often or use cards of different operators, the information will be especially useful.

What is the Dual 4G Mode and How it Works?

Dual mode 4G (or DSDS — Dual SIM Dual Standby is a technology that allows a smartphone to work with two devices at the same time. SIM-net-card 4G LTE. Unlike the classical system, where the second SIM switch 2G/3G When the first card is active, both cards can support high-speed Internet.

However, there is a critical limitation: in Dual mode. 4G The smartphone cannot be used at the same time. 4G both SIM-This is due to hardware limitations — most Qualcomm Snapdragon and Mediatek chips in budget and mid-budget Redmi have a single module. 4G, It's a dynamic switch between cards:

• 📶 Basic SIM (Slot 1 - always in 4G, if the signal is available.
• 📱 Second second SIM (Slot 2 - switches to 4G only when the first one is not active (no call/internet session).
• ⚡ Internet speed – with active traffic on one SIM The second one automatically reduces priority.

In practice, this means that if you download a file on the first SIM, the second temporarily “sinks” to 3G or even 2G. The manufacturer positions Dual 4G as “simultaneous” work, but in fact it is a dynamic switch with delays of up to 2-5 seconds.

⚠️ Note: In Redmi models with Snapdragon chip 4xx/6xx (For example, Redmi Note 10/11) dualism 4G This can lead to increased battery consumption 10–15% due to the constant switching of the module.

Xiaomi Redmi models support Dual 4G

Not all Xiaomi Redmi smartphones are equipped with hardware support for Dual 4G. The function is available mainly in models released after 2019, with Snapdragon 7xx/8xx or Mediatek Helio Gxx/Dimensity chips. Below is the compatibility table of popular devices:

To find out exactly if your model supports Dual 4G, check the specifications on the official Xiaomi website or use the CPU-Z application (System → Hardware section). Note that even if the chipset supports the function, the manufacturer can disable it software (for example, in regional firmware for Russia).

How to enable Dual 4G on Xiaomi Redmi: step-by-step instructions

Activation of Dual mode 4G It takes less than a minute, but it requires the right sequence of actions. SIM-card 4G (Check with the operator and inserted into the correct slots.

1. Open the Settings. → SIM-maps and mobile networks.
2. Select the Settings item SIM-map №1 (or) №2 if you want to change your priority).
3. Tap on Network Type and select 4G (recommended).
4. Go back and select Dual 4G Mode (or Enable 4G on both SIMs – the name depends on the version of MIUI).
5. Reboot your smartphone to apply the changes.

Check carrier 4G support | Make sure SIMs are inserted into the correct slots | Update MIUI to the latest version | Turn off VPN before setting up |Reboot phone after changes

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If Dual 4G mode is not on the menu, it means that your model does not support the hardware function, in which case you can try an alternative method through the engineering menu:

1. Enter the combination in the Phone app: ##4636##.
2. Go to the phone information.
3. Select Set your preferred network type for each SIM.
4. Install LTE only for both cards (risky - it may miss the connection!).

⚠️ Attention: Compulsory inclusion LTE Only through the engineering menu can cause loss of communication on one of the SIM, If the operator does not support VoLTE, for example, Tele2 and Yota may have problems with voice calls.

Limitations and problems of Dual 4G on Xiaomi Redmi

Despite the obvious advantages, the Dual 4G mode has a number of hidden drawbacks that the manufacturer does not mention.

• 🔋 Increased battery consumption – constant switching of the module 4G Increases energy consumption by 10-20%.
• 📞 Missed calls - if one is a SIM active (for example, a file is downloaded), the second may not receive incoming calls due to a delay in switching.
• 🌐 Unstable Internet with weak signal 4G Smartphone can “hang” between networks, causing connection breaks.
• 📡 Operator restrictions – not all providers support VoLTE on the second SIM (For example, MTS roaming).

Especially critical is the problem with missed calls on the second SIM. For example, if you use the first card for the Internet (download the update), and the second comes the call, the smartphone may not have time to switch, and the subscriber will hear “unavailable.” The solution is to disable the background data transfer for the main SIM in the settings Mobile network → Background mode.

Another nuance is roaming, where many Redmi users complain that when traveling abroad, Dual 4G is automatically turned off and the second SIM switches to 2G. This is due to local carrier policies, for example, in Turkey or the UAE, some providers block 4G for foreign SIMs.

Dual 4G vs Dual VoLTE: What’s the difference and what’s better

Users often confuse Dual 4G Dual VoLTE is a different technology with different capabilities. DSDV — Dual SIM Dual VoLTE allows both of them to be SIM-maps simultaneously work on the network 4G No switching, including voice calls over VoLTE.

Key differences:

Dual VoLTE is more advanced technology, but it is only available in top Xiaomi models (such as the Redmi K60 or POCO F5). For most of the Redmi mid-segment (Note 11, Redmi 10), only Dual 4G is implemented with its limitations.

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If your operator supports VoLTE (for example, Beeline or MegaFon), but there is no Dual VoLTE in your smartphone, turn on the VoLTE Call option for at least the main SIM.

When to turn off Dual 4G on Xiaomi Redmi

Despite the advantages, there are situations where Dual 4G mode is better to deactivate:

1. Weak 4G signal – if your region is not receiving well, switching between SIMs will only make communication worse.
2. Using modem modem mode - when distributing the Internet (USB/Wi-Fi) second-second SIM It can be completely disconnected from the network.
3. Battery savings – If you don’t need internet on a second SIM, disabling Dual 4G will extend battery life by 15-20%.
4. VoLTE issues – if the carrier does not support 4G voice calls, it is better to return to standard mode (4G+3G).

To disable Dual 4G:

1. Go to Settings. → SIM-maps and mobile networks.
2. Select Dual 4G Mode and deactivate the slider.
3. For the second SIM, set the 3G or 2G network type.

⚠️ Attention: On some firmware MIUI (For example, the global version for Redmi Note 10 disables Dual 4G may reset the settings APN. After deactivation, check that the Internet is working and if necessary, resave the configuration of access points.

Frequent questions about Dual 4G on Xiaomi Redmi

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Dual mode 4G Xiaomi Redmi is a trade-off between speed and stability. SIM, But you need to be configured to a specific operator and model of a smartphone, and if you want a trouble-free connection, you'd better use standard mode. 4G+3G.