How to choose SIM-Default map on Xiaomi: a complete guide with pictures

You just bought the new Xiaomi Redmi Note 12 or POCO X5 Pro, put two in. SIM-- but the phone is persistently using the wrong network for calls or mobile Internet? MIUI 14 settings reset and now messages are leaving the wrong number? This problem is familiar to many owners of two-symbol Xiaomi smartphones - especially when it comes to choosing the right number. SIM-Default cards for different types of connections.

In this article, we will not only discuss basic settings (which are often hidden in the depths of the menu), but also the nuances for specific models (Redmi 10C, Xiaomi 13 Lite), firmware versions (MIUI 12-14), as well as solutions to typical errors - for example, when the SIM option is simply inactive on the menu or resets after a reboot, you will learn how to link different actions (calls, SMS, 4G) to different cards, why settings are sometimes not saved, and what to do if the phone ignores your preferences.

Why it's important to set up SIM-default-card

At first glance, the choice of the main SIM-The cards seem like a small thing, but in practice, it affects the:

• 📞 Outgoing calls: If you don’t prioritize, the phone may be calling from an “uncomfortable” number (e.g., a worker instead of a personal one).
• 💬 SMS and MMS: The messages will leave the card that the system considers “major”, which is critical for bank notifications or two-factor authentication.
• 🌐 Mobile Internet: without the right setup 4G/5G You may be connected to a slow network or refuse to work at all.
• 🔄 Automatic services: Some apps (like Google Messages or WhatsApp) are linked to SIM-default-card.

What’s more, MIUI has a hidden feature: if you don’t specify a priority SIM for data, a smartphone can randomly switch between networks when the signal is weak, which leads to connection breaks, especially for models with Dual 5G (for example, Xiaomi 12T Pro), where both cards support high-speed Internet, but the stability of the operation depends on the settings.

Where to find settings SIM-maps on Xiaomi: the way to MIUI 12, 13 and 14

MIUI interface changes with each version, so the path to settings may be different. We have collected the current routes for firmware 2021-2026:

If you have a POCO shell with a POCO Launcher, the path may be slightly different — look for the SIM and network section in the main settings menu. On some models (for example, the POCO F4 GT), the options are duplicated in the Quick Settings Panel (swipe down from the top edge of the screen → Mobile Data icon).

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If you can not find the SIM-card menu, try to enter the search by settings (lamp at the top of the screen) the request “SIM by default” – the system will tell you a direct path.

Step-by-step instructions: how to choose SIM-default-card

Consider a universal algorithm for all versions of MIUI. Example made on Xiaomi 13 Lite with MIUI 14.0.5 firmware, but it is suitable for other models:

1. Open Settings (the gear icon on the main screen).
2. Go to the Mobile Network section (or SIM-Maps and mobile networks in older versions).
3. Slip it by the name of that one. SIM-The card you want to make the main one (for example, MTS 1 or Beeline 2).
4. In the menu that opens, select Use for (or Default).
5. Set the boxes opposite the desired options: 📞 Calls - for outgoing calls. 💬 SMS — message-post. 🌐 Mobile data for the Internet.

Save the changes (in some versions of MIUI, there is no Save button – settings are applied automatically).

Calls go away with the right call. SIM|SMS They're coming from the right number.|Mobile Internet Connected to Priority Card|Settings saved after rebooting-->

If the option to use is inactive (grey), this may mean:

• 🔌 SIM-card not recognized (check if it is inserted correctly in the tray).
• 📵 There is no network signal on the map (switch the phone to airplane mode and back).
• 🔄 Settings are blocked by the operator (relevant for corporate tariffs).

Frequent problems and their solutions

Even after the setup SIM-The default default card is a bug, and here are the most common ones and how to fix them:

⚠️ Attention: If after the selection SIM By default, settings are reset when you restart, try turning off Auto Network Selection in the mobile data menu.

Special situation: if you have Xiaomi with a hybrid slot (for example, Redmi 9A, where the second slot is combined with a memory card), the first physical SIM will always be given priority.

Features for specific Xiaomi models

Some Xiaomi smartphones have unique nuances when working with two SIM-Let's look at these in some of the most popular devices:

Xiaomi 12/13 Series (Flagships with Dual 5G)

These models are both SIM-card 5G, But by default, the Internet only works through the first card. 5G second:

1. Go to Settings. → Mobile network → Name. SIM-map → Type of network.
2. Choose 5G (not Auto!).
3. Enable the option to Enable 5G (if any).

Redmi Note 11/12 (budget models)

There is a common bug: after upgrading to MIUI 14, the ability to choose SIM for SMS disappears.

• Install a third-party SMS application (like Google Messages).
• In the application settings manually specify the desired SIM.

POCO F3/F4 GT (Game Smartphones)

On these devices, when Game Turbo mode is activated, mobile data can automatically switch to the second SIM to "load balance."

1. Open Settings → Special Opportunities → Game Mode.
2. Turn off the network optimization option.

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On Xiaomi flagships (12/13 series) for stable operation of Dual 5G, it is recommended to manually set the network priority for each SIM, rather than relying on “Auto”.

How to check if the settings are applied correctly

To make sure that SIM-The default card is configured correctly, follow the following steps:

1. Call test: Call another number and check which number is coming from (displayed in the top panel at the time of the call).
2. SMS Test: Send a message to a short number (e.g. *100# for balance) and the reply will indicate the sender number.
3. Internet test: Turn off Wi-Fi and open your browser. The status bar should display a 4G/5G letter with the priority SIM name.
4. System Check: In the SIM-card menu next to the name of the main card should appear the inscription "By default".

If something goes wrong, use the call log:

• Open the Phone app.
• Go to the magazine tab.
• Slip on the last outgoing call - in detail will indicate which SIM it was made with.

⚠️ Note: At some operator rates (e.g. Tele2’s “Unlimited”), outgoing calls can be automatically redirected to the main subscriber number, ignoring the phone’s settings.

Additional settings for advanced users

If standard options are not enough, you can use hidden MIUI functions or third-party tools:

1. Forced choice SIM through USSD-code

Some operators allow management SIM-And then we use maps through service teams:

• For MTS: dial *111*555# and follow the instructions.
• For Beeline: *110*181# (service management).

These commands will not replace system settings, but will help diagnose problems on the operator side.

2 Automation through MacroDroid

MacroDroid (available on Google Play) allows you to create rules for automatically switching SIM.

• 🕒 Switch the Internet to the second SIM At night (if she has no limit).
• 📍 Change network priority depending on location (home/work).

3. Editing settings through ADB

For power users: You can manually prioritize SIM via ADB commands. Example for setting the first default SIM:

adb shell settings put global multi_sim_data_call 0


adb shell settings put global multi_sim_sms 0




adb shell settings put global multi_sim_voice_call 0

Where 0 is the SIM index, 1 is the SIM index, and beware: the wrong commands can disrupt the network!

FAQ: Answers to Frequent Questions