Xiaomi smartphone owners often face the need to use two SIM-Cards are both for work and personal use, to save on roaming or to split traffic, but not everyone knows how to properly install and configure dual SIMs, especially if it is a hybrid slot or new models with support 5G. In this article, we will analyze all the nuances: from the physical installation to the software setting of network priorities.
It is important to understand that not all Xiaomi devices support two. SIM-For example, in some models, the second slot is hybrid – it can work either with a nano-SIM or with a microSD memory card.+) There are often dedicated slots where both SIMs are installed without conflict with the drive. We will explain in detail how to determine the type of slot in your model and avoid installation errors.
If you have never opened the door for SIM-If you are afraid of damaging your smartphone, don’t worry: the process is as simple as possible, and our step-by-step instructions with photos and videos will help you cope in 2 minutes. SIM into MIUI, including the choice of the main SIM for calls, SMS and mobile Internet.
What Xiaomi models support two SIM-map
Before you try to insert two SIMs, make sure your Xiaomi model supports this feature at all.Most of the brand's modern smartphones are equipped with dual slots, but there are nuances:
- 📱 Budget series (Redmi) A2, POCO C55): plug-in (SIM + microSD or 2 SIM).
- 📱 Mid-size segment (Redmi Note 12, POCO X5 Pro: dedicated slots for two nano-SIMs + MicroSD slot (in some versions).
- 📱 Flagships (Xiaomi) 13T, Mix Fold 3: Always two nano-SIMs without hybrid solutions.
- 📱 Outdated models (until 2018): can only support one SIM Micro-SIM (check the specifications).
To find out the configuration of the slots, check:
- The official site of Xiaomi in the section of technical characteristics of your model.
- Inscriptions on the tray for SIM-maps (usually indicated) SIM1 + SIM2 or SIM + microSD).
- Settings menu: Settings → About phone → Equipment specifications.
In support models 5G (For example, the Redmi Note 12 5G or POCO F5) second-second SIM-The card can only work on networks 4G, if the first use is 5G. This is a hardware limitation and cannot be circumvented by software.
Preparation: which SIM-Maps and tools will be needed
To set up two SIM-You will need maps from Xiaomi:
- 📶 Two nano-SIM (format) 4FF, 12.3×8.8 If you have the usual SIM Micro-SIMs, they must be trimmed or replaced in the cabin of the operator.
- 🔧 A paper clip or key to extract the tray (combined with a smartphone) will also work.
- 🔍 Good lighting – the tray is small and the contacts are small SIM-Cards are sensitive to pollution.
- 🧴 Alcohol wipes (optional) – for cleaning contacts, if the SIMs were previously used in other devices.
⚠️ Warning: Never use metal objects (knives, scissors) to retrieve the tray - this can damage the mechanism or leave scratches on the case.If the key is lost, buy a plastic extractor for the purpose of removing the tray. SIM-card (worth) ~50 rubles).
If you are planning to use a microSD with one SIM-The card in the hybrid slot, take into account:
- 📉 The speed of the drive can decrease with active use of the second SIM.
- 🔄 When rebooting a smartphone, you sometimes need to re-select a priority slot in the settings.
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Before installing new ones SIM-Make a backup copy of the contacts and SMS through settings → Google → Backup. When you change the SIM, old messages and numbers may disappear!
Step-by-step: how to insert two SIM-maps in Xiaomi
Now, to the process itself, follow the instructions carefully so that you don't damage the tray or the contacts.
- Turn off your smartphone. It's a hot replacement. SIM-The card can cause a modem malfunction.
- Find a tray for SIM-In most Xiaomi models, it is located on the upper or lateral edge (for example, in Redmi Note 11 - left, in the upper side). POCO X4 Pro - top).
- Remove the tray: Put the paper clip in a small hole next to the tray. Push until you click, the tray will extend a little. Pull it out carefully with your fingers.
- Install. SIM-Maps: Place the tray on a flat surface with the contacts upwards. Place the nano-SIM in the appropriate slots (usually SIM1 and SIM2 Make sure the bevelled angle of the simki matches the angle on the tray.
Put the tray back in:
- Carefully insert it into the smartphone to the point (do not make an effort!).
- Make sure the tray sits flat and does not protrude.
- Turn on your phone and wait for network recognition (can take up to 2 minutes).
If one of the sims is not determined after inclusion:
- 🔄 Reboot your smartphone.
- 🔧 Check if it is installed correctly SIM-card (sometimes it is shifted when inserting the tray).
- 📶 Try inserting the SIM into another slot (the contact may have been damaged in the first slot).
☑️ Pre-installing check SIM-map
Dual SIM setup in MIUI: network priorities and parameters
After the physical installation of the sims, you need to configure them software, and MIUI (Xiaomi firmware) has a special section for this:
- Go to Settings. → SIM-maps and mobile networks.
- Select Control. SIM-map.
- Set up the following parameters: 📞 Calls: Select the default SIM for outbound calls. 💬 SMS: Specify a SIM for sending messages. 🌐 Mobile data: select a SIM for the Internet (you can change in the notification curtain). 🔄 Auto-Switching: Turn on if you want your smartphone to automatically switch to the SIM with the best signal.
For models with VoLTE support (voice over 4G), additional settings are available:
- 📶 Enable VoLTE calls for both sims (if the operator supports the caller).
- 🔄 Set up Network Priority (for example, 4G/3G/2G (car) or Only 4G).
⚠️ Note: If you use a microSD in a hybrid slot, then when you use an active second slot, you will be able to use it. SIM-The card will have the drive turned off, and to get back to the files, you'll have to pull one of the sims.
| Parameter | SIM1 | SIM2 | Note |
|---|---|---|---|
| Default calls | ✅ | ❌ | You can change before the call. |
| Mobile Internet | ❌ | ✅ | Switching in the curtain |
| SMS default | ✅ | ❌ | Does not affect the reception of messages |
| VoLTE | ✅ | ✅ | It only works if the operator supports it. |
Frequent problems and their solutions
Even after the correct setting of the sims, there may be failures. Let's consider typical situations and ways to fix them:
- 🚫 SIMCA is not defined: Check if your model supports two SIM-Cards (see section 1) Clean the SIM and tray contacts with alcohol. Try inserting the SIM into another slot.
- 📵 No network on one of the sims: Reboot your smartphone. Check if Flight Mode is on for a particular SIM (occasionally in the video). MIUI). Update the operator settings: Settings → SIM-map → [sim] → Update settings.
- 🔋 Battery goes down fast: Turn off Search Network Auto for the second SIM. Set it up only. 2G (if not 4G).
- 📱 Smartphone overheats: This is normal when you first connect two sims (modem calibrates). If it's warming constantly, check the network load (for example, background updates to apps).
If the problems don’t go away, try:
- Reset network settings: Settings → SIM-map → Resetting mobile network settings.
- Update the MIUI firmware to the latest version (sometimes bugs with SIMs are fixed in patches).
- Contact the service center (possibly damaged modem or antenna).
What if the tray is jammed?
Features of the use of two SIM-Maps in different Xiaomi models
Depending on the series and year of release of the smartphone Xiaomi has specific nuances of working with two SIMs.
Redmi Note (2020–2026)
Most models (Redmi Note 10/11/12/13) use dedicated slots for two nano-SIM + a separate microSD slot. Except for Redmi Note 9 Pro (hybrid slot).
- 📶 Dual support 4G (both Sims work in 4G simultaneously).
- 🔋 Increased power consumption with active use of two sims (10-15% faster discharge).
POCO (series X, F, M)
POCO devices typically inherit the hardware platform from Redmi, but with optimized software.
- 🚀 V POCO F5 and X5 Pro implemented improved support 5G + 4G (first-sim — 5G, second-second — 4G).
- 🔧 There is a Dual option in the settings SIM Dual Standby (DSDS) — Allows both SIMs to be active at the same time (unlike Dual) SIM Single Standby, where one SIM sleeps").
Xiaomi Mi and Xiaomi 12/13/14
Flagship models are equipped with the most advanced modems, but there are limitations:
- 📡 Xiaomi 13 Ultra and 14 Pro second SIM-card does not support 5G, if the first is connected to 5G-network.
- 🔒 In some regions (e.g. China), the sim tray may be blocked for foreign operators (check before buying).
⚠️ Note: In models with eSIM (e.g. Xiaomi) 12T Pro) can combine a physical nano-SIM with a virtual one, but not all Russian operators support eSIM.
How to optimize the work of the two SIM-battery-saving cards
Two active SIM-The cards increase the load on the modem, which leads to increased charge consumption, so that the smartphone lasts longer:
- 🔋 Turn off background data for the second SIM: Go to Settings → SIM-map → [choose SIM2] → Background data transfer. Select Disable or Wi-Fi Only.
Set the priority of the network:
- For the main SIM, leave 4G/3G/2G (auto).
- For the second, install 2G only (unless you need fast internet).
Use the "Energy Saving Mode" to SIM-map:
- MIUI 14+ has the option of Energy Saving mobile network (in the SIM settings).
Turn off the unused SIM for the night:
- In the notification curtain, tap the SIM icon and select Disable.
We also recommend:
- 🔄 Regularly (once a month) reboot the smartphone – this resets the modem cache.
- 📴 Disable Network Autosearch for both SIMs (if the signal is stable).
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Optimal mode for battery saving: the main sim on 4G with VoLTE, the second - on 2G with the background data transmission disabled.