How does 2 work? SIM-Xiaomi maps: a complete guide to setup and use

Xiaomi smartphones have long been the standard for users who need flexibility in communication management. SIM-While cards are one of the key advantages of the brand’s devices, not everyone knows how to configure this feature correctly. Unlike budget phones with simplified logic, Xiaomi’s flagship and mid-budget models (for example, the Redmi Note 12 Pro)+ Xiaomi 13 Ultra offers advanced options: from network priority to separate Internet traffic management.

In this article, we will discuss not only the basic principles of duality.-SIM, But also nuances that are not written in the official instructions. SIM can “muffle” the signal of another, how to save battery power when you actively use two cards, and what to do if the smartphone does not see the second card SIM post-refresh MIUI. You will also find out which Xiaomi models support. 5G + 4G At the same time, which are limited by the regime 4G + 4G — This is critical for choosing a device.

We pay special attention to hidden settings MIUI, which allow for fine-tuning of behavior SIM-From automatically switching to a more stable network to blocking roaming notifications for a specific card, these chips are available even on budget models like the Redmi. 10A, But most users are unaware of them.

How to physically set two SIM-maps in Xiaomi

Before setting up the software part, you need to insert correctly SIM-Xiaomi has two types of slots:

• 🔄 Hybrid slot (SIM + microSD or two SIM): Most of the models are available (Redmi Note 11, POCO X4 Pro, you'll have to choose between the second. SIM memory-card.
• 📱 Two separate slots (only) SIM): characteristic of flagships (Xiaomi) 12T, Xiaomi 13 allows two nano-SIMs to be used without casualties.

To insert the cards:

1. Turn off your smartphone (required! otherwise you risk damaging your contacts).
2. Find a tray for SIM On the side of the box (usually on the left) use a clip or a special key from the kit to extract it.
3. Place the nano-SIM in the tray with metallized contacts down. SIM or microSD is installed in the top connector.
4. Carefully insert the tray back before the click.

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If the tray is not inserted to the end, check whether the tray is skewed. SIM-A common mistake is to install the card "upside down", which causes the smartphone to not see the network.

After turning on the phone MIUI It will automatically identify the operators if one of them SIM unrecognizable:

• 🔧 Reset the device.
• 📶 Check if your Xiaomi supports your carrier frequencies (relevant to the user’s frequency). 4G/5G). Like Redmi. 9A Doesn't support the band. 20 (800 MHz, which can cause communication problems in rural areas.
• 🛠️ Clear the contacts. SIM-cards with soft cloth (sometimes oxidation interferes with communication).

Setting up two SIM into MIUI: step-by-step

Once you've set up the cards, you need to adjust their behavior. → SIM-Maps and mobile networks. Key options are available here:

Important nuance: in MIUI 14/15 The function “Smart data switching” (Settings) → SIM-map → She's automatically using that one. SIM, But this option can drain the battery faster because the smartphone is constantly scanning the networks.

Make sure both cards are active in status.|Assign convenient tags for SIM|Choose the main one. SIM call-in/SMS|Turn off the mobile internet on the second SIM, if not|Check the support 4G/5G for each card-->

If you need one of them SIM It was used only for calls, and the second for the Internet:

1. Open the Settings. → SIM-map → Mobile Internet.
2. Choose. SIM data-transmitting.
3. Go back and enter another section in the Calls section. SIM basic.

How the Internet works for two people SIM-card

Simultaneous use of mobile Internet with two SIM — In Xiaomi (as in other smartphones) active for data transfer can be only one SIM-But there are nuances:

• 🌐 Automatic switching: if active SIM communication is lost, the smartphone can switch to the second (configured in Settings) → SIM-map → Data switching).
• 📶 Roaming: If you are in another country, you can manually select a local one SIM The main one is for the internet, and the main one is for calls.
• ⚡ Savings in traffic: in MIUI There is an option to limit the background for individual SIM (This is useful if you have a limited rate).

It is important to understand that when you have an active Internet on one SIM The second card may be worse at catching signals, due to hardware limitations: most Xiaomi smartphones (except flagships like Xiaomi). 13 Pro) lacks antenna modules to fully operate the two SIM into 4G/5G For example, if you download the file on the first one. SIM, The second can switch to 2G energy-saving.

To check which one SIM It is now used for the Internet:

1. Open the notification panel.
2. Click on the mobile network icon (for example, 4G or 5G).
3. The window that appears will indicate which SIM data-transmitting.

Savings in battery when using two SIM

Two active SIM-The cards can increase battery consumption by 15 to 30 percent, as the smartphone is constantly scanning the networks of both operators:

• 🔋 Turn off network search on the second SIM: If you rarely use it, switch to mode only 2G (Settings → SIM-map → Preferred type of network).
• 📵 Turn off the mobile internet on unused SIM (see the table above).
• ⏳ Set up the “Energy Saving Mode” for a specific SIM: into MIUI 15 This is done in Settings → Battery → Energy conservation SIM.

Another life hack: if you're in a low-coating area, your smartphone will actively search for the network, which will put a lot of battery life on the grid.

1. Go to Settings. → SIM-map → Searching the net.
2. Select Manual Search and manually specify the operator (instead of automatic mode).

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The most effective way to save charge is to turn off 5G and 4G second SIM, If you only need it for calls, it will reduce the load on the modem and extend the time by 10-15%.

In support models 5G (for example, Xiaomi 12T or POCO F4 GT) If you don't want super high speeds, switch to the battery. 4G customized SIM. Also check if the option “Enhanced Mode” is included. 5G» (Settings → SIM-map → Regime. 5G) — It increases speed, but also energy consumption.

Common Problems and Their Solutions

Even with the right setup with two SIM-And if you look at the maps, you can see the problems, and you can look at the typical situations and how to fix them:

⚠️ Note: If after the update MIUI one of them stopped working. SIM, Don't rush to reset. First, check if the settings are off. APN (This is a common problem when switching to new versions of firmware.

If the smartphone has stopped seeing one of the SIM After a drop or moisture, the problem may be hardware:

• 🛠️ Check the tray for damage (sometimes it is enough to replace the tray to restore communication).
• 🔍 Check the contacts on the board (this will require disassembling the device).
• 📞 Contact the service center if self-diagnosis does not help.

Diagnosing network problems in MIUI snail-menu:

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Select your phone information and check your status. SIM-If there is an unknown or no service next to one of them, the problem may be on the operator's side.

Features of the two SIM in different Xiaomi models

Not all Xiaomi smartphones are equally good at two. SIM-Here are the key differences:

• 📱 Budget models (Redmi) 10A, POCO M4 Pro: Support only: Support only 4G + 4G. With an active internet on one SIM second-hander 2G.
• 💎 The middle segment (Redmi Note 12 Pro)+, Xiaomi 11 Lite: Support for the new model 5G + 4G, but without simultaneous work in 5G both SIM.
• 🏆 Flagships (Xiaomi 13 Ultra, Xiaomi) 12S Ultra: Supporting DSDA (both SIM may work in 4G simultaneously, but 5G available only on one map.

Regional restrictions are also worth considering: Xiaomi sold in China may not support European carrier frequencies, for example, and check compatibility on sites like FrequencyCheck before buying.

In models with Qualcomm Snapdragon (for example, POCO F5) two-way SIM It is usually more stable than in MediaTek devices (e.g. Redmi). 10C). The latter may suffer from network hangings when switching between cards.

Hidden functions MIUI steer SIM-map

V MIUI There are several hidden options that make it easier to work with two. SIM:

• 🔒 Blocking roaming notifications: If you travel frequently, you can turn off intrusive alerts for a specific specific destination SIM. To do this, go to the Settings. → Notifications → Additionally. → Roaming notifications.
• 📞 Quick switching SIM When you call, if you start calling with one SIM, If you want to switch to another, click on the icon. SIM in the call interface and select another card.
• 🌍 Priority of the network for roaming: in Settings → SIM-map → Roaming can be indicated which SIM It should be used abroad by default.

Another useful feature is “Separate Spaces” (Settings) → Special facilities → Separate spaces. It allows you to create two independent desktops with different settings for each. SIM. For example, one can hold work applications, and the other – personal applications.

For advanced users, there is an opportunity to configure call forwarding between SIM-map:

1. Open the Phone app.
2. Click on the three dots in the top right corner and select Settings. → Call forwarding.
3. Please specify the terms (e.g., “If unavailable” or “If no response is received”) and the number for forwarding.

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V MIUI 15 The function "Intellectual choice" appeared SIM», It analyzes the quality of the connection and automatically suggests switching to a more stable network. → SIM-map → Intelligent choice.

FAQ: Frequent questions about two SIM Xiaomi