How to change SIM-Default map on Xiaomi smartphones: the full guide

Why do we change? SIM-Default card and when it is needed

Modern Xiaomi smartphones (including the Redmi line, POCO and Mi support the work of two SIM-But by default, the system automatically selects the main card for calls, SMS And mobile Internet, and that's not always the best choice, and you might find, for example, that you have a smartphone that's used very hard for the Internet. SIM with limited traffic, and for calls – a card with expensive charging.

Change of change SIM-The default card solves several key tasks:

• 📞 Savings on calls – choosing a card with a favorable tariff for outgoing calls.
• 📶 Traffic Control – Linking the Mobile Internet to SIM limitless.
• 💬 Sharing Contacts – Using Different Cards for Work and Personal Messages.
• 🌍 Roaming – Quick switch to local SIM abroad.

It’s important to understand that default settings can be lost after updating MIUI or resetting the phone to factory settings. In addition, some models (such as the Xiaomi 13 Pro or Redmi Note 12 Pro+) allow you to flexibly set priorities for each type of connection separately – calls, SMS and data.

Preparation: Checking support for Dual SIM and MIUI versions

Before you start changing your settings, make sure your smartphone supports two. SIM-Most modern Xiaomi models are equipped with a hybrid slot nanoSIM + nanoSIM/microSD, But there are exceptions, like flagship devices like Xiaomi. 14 Ultras can have separate slots for each card.

To check the compatibility:

1. Open Settings → About the phone → All the characteristics.
2. Find the line "Quantity" SIM-maps" - must be indicated 2.
3. Check out the MIUI version in the same menu. Current versions (14+) support advanced Dual SIM settings.

⚠️ Attention: On devices with MIUI Global and MIUI Europe's Dual Settings Menu SIM If you have custom firmware (e.g. Xiaomi.eu), some items may be renamed or moved.

Step-by-step instruction: modification SIM-default-card

Replacement of the main SIM-The card takes no more than 2-3 minutes. Follow the instructions below to set priorities for calls, SMS and mobile Internet.

Step 1. Open the Dual SIM settings

Go to Settings. → SIM-maps and mobile networks → Dual settings SIM. In some models (for example, POCO X5 Pro) the path may look like Settings → Connections and sharing → SIM-map.

Step 2. Choose SIM-call-card

In the section "Voice calls" tap on the line SIM-Map for outgoing calls and select the desired card (SIM 1 SIM 2) Here you can configure the redirection of incoming calls to another SIM, if the main one is not available.

Step 3: Set up SIM for SMS

In the same menu, find a paragraph. SIM-map SMS. Select the card that will be used to send messages by default. Please note that if you use instant messengers (such as WhatsApp or Telegram), this setting does not affect them.

Step 4: Set SIM for mobile internet

Go back in SIM-maps and mobile networks and select Mobile Internet:

• 📶 Specify the main SIM data-transmitting.
• 🔄 Include the option "Automatic choice" (if available).
• 📊 View traffic consumption statistics for each card.

Make sure the SIM is active (signal is available)

Check the balance on the card (for rates with payment for traffic)

Disable "Select" if it interferes with priority

Reboot the phone to apply changes (optional)-->

⚠️ Note: Some models (e.g. Xiaomi) 12T Pro) after modification SIM The Internet may require a device reboot to take effect. If the mobile Internet does not work immediately, restart the smartphone.

Advanced settings: priorities for individual contacts

Branded shell MIUI allows you to assign specific SIM-It's convenient if you want to make calls to your colleagues always through the workbook. SIM, Personally, through personal.

How to set up:

1. Open the Contacts app.
2. Select the desired contact and tap Edit (pencil icon).
3. Scroll down to the field "SIM-Default card and specify the desired card.
4. Save the changes.

This function only works for outgoing calls. For incoming contacts, SIM priority is determined by the general settings (see section above).

Also in MIUI 14+ It is possible to create a Dual profile. SIM — Pre-configured priority combinations for different scenarios (work, travel, savings) to activate the profile, go to Settings → SIM-maps and mobile networks → Dual profiles SIM.

Problems and Solutions: Why Settings Are Not Saved

Sometimes users are faced with changes SIM-The default cards are not applied or reset. Let's look at the typical reasons and ways to fix them.

If the problem persists, try resetting your network settings:

1. Go to Settings. → SIM-maps and mobile networks → Resetting network settings.
2. Confirm the action (a password is required or PIN-code).
3. After resetting, reset your SIM priorities.

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If after resetting the network settings, mobile Internet disappeared, check APN-profile for your operator. Pathway: Settings → SIM-maps and mobile networks → [choose SIM] → Access points (APN). Usually the profile is loaded automatically, but sometimes manual settings are required (you can request them from the operator).

Features for specific Xiaomi models

Some Xiaomi devices have unique nuances in the Dual SIM setting. Let’s consider the most popular models.

Xiaomi 13/13 Pro/13 Ultra:

These flagships support Dual 5G — both SIM-The cards can work simultaneously on the network. 5G (if the operator provides such an opportunity), however, the activation of the function requires:

1. Update the firmware to MIUI 14.0.4+.
2. Enable the option in Settings → SIM-maps and mobile networks → Dual mode 5G.

Redmi Note 12 Series:

These models have a Smart Switch feature that automatically selects the SIM with the best signal for calls, to turn it off:

1. Go to Settings. → SIM-maps and mobile networks → Intelligent switching.
2. Turn off the slider.

POCO F4/F5:

On these devices, the Dual menu SIM The path to the path is deeper: → Connections and sharing → SIM-map → Dual settings SIM. Also in POCO Launcher may not have a shortcut for quick switching SIM (unlike the standard MIUI Launcher).

⚠️ Note: On Xiaomi Black Shark (game series) Dual settings SIM They may differ due to the scalp. JOYUI. If you don’t find the menu items you need, try searching by settings (the magnifier icon in the upper right corner).

Alternative methods: quick switching and widgets

If you have to change often SIM-Default card, you can use convenient tools for quick switching.

Method 1. Mobile data widget

Add the "Mobile Data" widget to the main screen:

1. Click the empty space on the screen → Widgets.
2. Find the Mobile Data widget (antenna icon).
3. Drag him on the screen.

Now you can quickly switch between SIM for the Internet without going into the settings.

Method 2. Notification panel

In MIUI 14+, a quick SIM switch for calls and data appeared in the notification panel:

1. Pull down the notification panel.
2. Find the tile. SIM-map (may be hidden – click Edit and add it).
3. Slip on the tile to select an active SIM.

Method 3: Voice assistant Xiao AI

If your device is enabled with Xiao AI (available in China and global firmware with a regional patch), you can use voice commands:

• 🎤 Say, "Change." SIM-call-card SIM 2".
• 🎤 Or: “Use SIM 1 for mobile internet".

Note:

💡

On devices with MIUI 14 and later, the fast SIM switches in the notification panel work even when the screen is locked – this is convenient if you need to urgently change your card to make a call.

FAQ: Answers to Frequent Questions