If you have ever heard of the term Dual 4G When you choose a Xiaomi smartphone, you might have wondered what it is and why it is needed in an era where even budget phones support two different types of phones. SIM-The card manufacturers are actively promoting technologies that allow both cards to be used simultaneously without compromise. 4G — This is one of these features, but it is often confused with VoLTE or Dual Standby, which leads to misunderstandings when buying.
In this article, we will discuss what is really behind the term Dual. 4G In the context of Xiaomi smartphones, how it differs from the other modes of operation of the two SIM-You will also learn how to test support for this feature in your model, how to turn it on (if possible), and what pitfalls users may have. 4G became the de facto standard.
What is Dual 4G in Xiaomi smartphones?
Dual 4G (or dual 4G VoLTE is a technology that allows a smartphone to work with two devices at the same time. SIM-net-card 4G (LTE), And you don't have to turn off one of them when you call or use the mobile Internet, unlike the classic Dual Standby mode, where the second one is called the second one. SIM-The card falls asleep when the first card is active, here both cards remain available for calls and data.
The main difference between Dual 4G and other modes is:
- 📞 Simultaneous work of both SIM into 4G: You can call one card while the other is using mobile internet.
- 🌐 Support for VoLTE on both sides SIM: high-quality calls (HD-voice) without switching 2G/3G.
- ⚡ Fast data switching: no delays in changing active SIM internet-based.
- 🔄 Parallel registration: both cards are constantly online, even if one of them is not active.
It’s important to understand that Dual 4G is a hardware feature that depends on a smartphone chipset. Not all Xiaomi models support it, even if the specs indicate “Dual SIM.” For example, budget phones on Snapdragon 4xx or Helio Gxx processors are often limited to Dual Standby mode, where the second SIM is turned off when you call.
Dual 4G vs VoLTE vs Dual Standby: What's the difference?
People often confuse Dual 4G with VoLTE or Dual Standby, although these are different technologies.
| Technology | Description | Advantages | Deficiencies |
|---|---|---|---|
| Dual 4G | Both SIMs are running 4G simultaneously, and support VoLTE. | ✅ No switching to 2G/3G✅ Internet and phone calls work in parallel. | ❌ Requires chipset support❌ Increased energy consumption |
| VoLTE | Voice Communication Technology Through 4G (HD-voice). | ✅ Best quality of calls✅ Quick connection. | ❌ Not all operators work.❌ It can be turned off at a weak signal. |
| Dual Standby | Both SIMs are active, but the second one is turned off when you call/internet. | ✅ Saves battery power✅ It runs on budget chipsets. | ❌ Switch to 2G/3G ring-bell❌ Shift delays SIM |
Critical difference: Dual 4G is a combination of Dual Standby + VoLTE on both SIMs, but with hardware support for simultaneous operation in 4G. For example, in Xiaomi Redmi Note 12 Pro+ or POCO F5 Pro smartphones, the Snapdragon 8+ Gen 1 chipset allows you to use both SIMs in 4G without switching, whereas in Redmi 10A (Helio G25 chipset) only Dual Standby is available.
⚠️ Note: If the characteristics of the smartphone indicate "Dual" 4G VoLTE, this does not guarantee the function of your operator. Tele2 Iota may not support VoLTE on the second SIM, Even if the phone is technically capable.
Which Xiaomi smartphones support Dual 4G?
Xiaomi’s list of Dual 4G models is constantly expanding, but there are key criteria:
- 📱 Flagship and mid-budget models: usually Snapdragon chipsets 7xx/8xx or Dimensity 900/1000+.
- 🔧 Two physical nano-SIMs: eSIM + Nano-SIM or two eSIMs may not support dual 4G.
- 📡 Regional firmware: Global (Global) and Indian (India) versions often disabled.
Current models (2023–2026) with confirmed support for Dual 4G:
- 🔹 Xiaomi 14 / 14 Pro (Snapdragon 8 Gen 3)
- 🔹 Redmi Note 13 Pro+ 5G (Dimensity 7200 Ultra)
- 🔹 POCO F6 Pro (Snapdragon 8+ Gen 1)
- 🔹 Xiaomi 13T / 13T Pro (Dimensity 8200 Ultra / 9200+)
- 🔹 Redmi K70 / K70 Pro (Snapdragon 8 Gen 3 / 8 Gen 2)
Budget models (e.g. Redmi) 12C, POCO M6 Pro) usually deprived of Dual 4G Because of the limitations of the chipset, to check for support in your model, go to Settings. → SIM-maps and mobile networks → Additionally, look for the option to Enable VoLTE/4G both SIM.
How to check support for Dual 4G in a non-activated smartphone?
How to enable Dual 4G on Xiaomi?
If your smartphone supports Dual 4G, activation usually takes several steps, but the interface may vary depending on the version of MIUI (14, HyperOS) and regional firmware.
Open the Settings. → SIM-maps and mobile networks
Choose the first one. SIM-map and turn on VoLTE
Repeat for the second. SIM-map
Go to Additional → Network Mode and select 4G/5G for both SIMs
Reboot your smartphone (required!)
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If VoLTE is not available for the second SIM, it can mean:
- 🚫 Chipset doesn't support Dual 4G (Check the list above).
- 🚫 The operator does not provide VoLTE for the second SIM (relevant Tele2, Iota, some virtual operators).
- 🚫 Installed custom firmware or regional version without support function.
⚠️ Note: Some models (e.g. Xiaomi) 12T Pro) after activation of Dual 4G You can experience increased battery consumption, up to 10 to 15 percent in 8 hours of standby time, due to the constant activity of the two modems.
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If you have disabled Dual 4G calls or lost the Internet, try manually prioritizing the network for each SIM in Settings → Mobile Network → Network Priority. For example, for the main SIM, choose 5G/4G/3G/2G and for the second, choose 4G/3G/2G.
Xiaomi’s Dual 4G Problems and Solutions
Even if your smartphone supports Dual 4G, users often face typical issues:
1.VolTE only works on one SIM.
Reason: the operator does not support VoLTE on the second SIM or the 3G/2G priority is selected in the network settings.
Solution: Contact the operator and request VoLTE activation for the second SIM. For example, MTS and Beeline do this through USSD-request *111*467#.
2. when calling on the second SIM, the Internet is turned off
The reason: the chipset does not support Dual 4G at the hardware level (for example, in the Snapdragon 6xx or Helio G9x).
Solution: Check the specifications of your CPU on Qualcomm or MediaTek, and if you don't have support, you just have to accept it or change your phone.
3. Fast battery discharge
The reason: Two 4G modems consume more power, especially in low signal conditions.
Solution: Turn off VoLTE on the second SIM if it is rarely used, or activate the power saving mode in Settings → Battery.
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After the update MIUI/HyperOS Dual 4G stopped working, try resetting the network settings: → SIM-map → Resetting mobile network settings. This often helps with software failures.
4G and 5G Dual: Are They Compatible?
With the advent of 5G networks, users are wondering: can Dual 4G be used alongside 5G? The answer depends on the chipset:
- ✅ Yes, if the chipset supports Dual. 5G (For example, Snapdragon 8 Gen 2/3, Dimensity 9000+). In this case, one SIM may work in 5G, And the second one is in 4G.
- ❌ Not if the chipset only supports Single. 5G (For example, Snapdragon 778G). Then when activated 5G one-on-one SIM second-to-second 3G/2G.
Examples of models with Dual 5G + Dual 4G:
- 🔹 Xiaomi 14 Ultra (Snapdragon 8 Gen 3)
- 🔹 Redmi K70 Pro (Snapdragon 8 Gen 3)
- 🔹 POCO F6 Pro (Snapdragon 8+ Gen 1)
Important: even if the chipset supports Dual 5G, the operator can limit this function, for example, in Russia MTS and Beeline allow 5G on only one SIM, and the second automatically switches to 4G.
Should I pay more for Dual 4G?
Whether you need Dual 4G technology depends on the use cases:
Dual 4G is useful if you:
- 📞 Often call one at a time. SIM, while the second is used for the Internet (for example, work) + personal).
- 🌍 Travel and use the local area SIM For data, keeping a home number for calls.
- 🎮 Play online games or watch streams on the mobile network without interrupting calls.
You can do without 4G if you are:
- 🏠 You use mostly Wi-Fi and rarely call on second-hand. SIM.
- 🔋 Value Autonomy: Dual 4G Increases battery consumption by 5-15%.
- 💰 Choose a budget smartphone (up to 20 000) ₽), wherein the function is rare.
Average price difference between Dual models 4G and without it in one segment - about 3000-5000 ₽. Redmi Note 13 Pro (without Dual) 4G) worth ~25 000 ₽, Redmi Note 13 Pro+ (Dual 4G) — ~30 000 ₽.
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If you use two SIMs of the same operator (for example, two MTS cards), Dual 4G will not give the advantage of activating the service "Multinumer" or "Double number".