How to change SIM-Default card on Xiaomi: 3 ways + fixing

Why Xiaomi is important to set up correctly SIM-default-card

Have you ever faced a situation where a call goes off with the wrong one? SIM-Is the mobile Internet suddenly shutting down? On Xiaomi smartphones with two SIMs, this problem occurs more often than it seems. MIUI It automatically prioritizes the first card you install, but it’s not always convenient — especially if you have different rates for calls and the internet.

In this article, we will discuss three official ways to change the SIM-Default card (for calls, SMS and mobile data, including hidden settings for older versions MIUI. You will also learn how to avoid switching errors, such as why a card may disappear after a change. 4G or stop coming SMS Instructions are relevant for all models: from the budget Redmi Note 12 to the flagship Xiaomi 14 Ultra.

Important: Starting with MIUI 13, the selection algorithm SIM-Now, the mobile data map has changed, and now the system can automatically switch between cards based on signal quality, even if you've manually prioritized it, and that's something that few people know, but we're going to show you how to turn it off".

Method 1: Standard settings menu SIM-map

This is the easiest method that works on all Xiaomi smartphones with the help of MIUI 12 and newer, suitable for shifts. SIM-default card for calls, SMS and mobile internet separately.

Open the Settings app (the gear icon on your desktop) and follow the following steps:

1. Go to section. SIM-Maps and mobile networks (some models may be called Mobile Networks or Dual Networks). SIM).
2. Tapping on the point of Management. SIM-maps (or settings) SIM-map).
3. Choose one of the options: 📞 Calls – you can set a priority here SIM for outgoing calls. 💬 SMS — map-setting. 🌐 Mobile data - choices SIM for the Internet (important: here you can turn on the Automatic selection, which is better to disable).

For each item, select the desired SIM-card from the drop-down list, the card names usually correspond to the operators (e.g., "MTS" or"SIM 1").

After changing the settings, restart your phone to avoid network glitching. If Mobile Data is inactive, check if mobile internet is enabled in quick settings (swipe down from the top of the screen).

Make sure that the mobile Internet works on the chosen one SIM|Call your number from another phone (checking outbounds)|Send. SMS by a short number (e.g. *100#)|Reboot your smartphone to apply changes|Check the balance on both SIM (Sometimes the change of priority is a downfall. USSD-request)

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Method 2: Quickly switch over notification panel

If you need to change temporarily SIM-card (for example, for a single call), you do not need to climb into the settings. MIUI There is a hidden function of fast switching:

1. Turn the notification bar swipe down from the top edge of the screen.

2. Find the badge. SIM-cards (two crossed cards) – if not, tap on a pencil (Edit) and add a widget SIM-card.

3. Click on the widget - a mini-menu with a selection of SIM for calls and SMS will open. For mobile Internet this method does not work!

This method is convenient if you switch between cards often, but remember: the settings will only remain until the next reboot.

Once a week |Only when the tariff changes |I never change |I don't know what it is |Another option

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Method 3: Hidden settings for older versions of MIUI (up to 12)

On smartphones with MIUI 11 and older (e.g. Redmi Note 8 Pro or Xiaomi Mi 9) settings interface SIM-There are no separate points for calls and SMS, But there are advanced options that allow you to flexibly configure the behavior of Dual-SIM.

To get into the hidden settings:

1. Open the Settings. → SIM-maps and mobile networks.
2. Tap the right one. SIM-maps, for example,"SIM 1").
3. Select Network Type, where you can prioritize 2G/3G/4G separately for each card, which is useful if one SIM only works in 2G (for example, for calls), and the other in 4G (for the Internet).
4. Go back and click Additional (or Advanced Settings: 🔄 Turn on/off Automatic network selection (it is better to disable if the signal is often lost). 📡 Set Network Mode (e.g., "Only" LTE" maximum speed). 🔒 Set up the PIN-code SIM-Cards (if the phone is often in the hands of other people).

Attention! Some firmware (especially custom ones) may not have these settings. If you don't have Additional, try resetting the network settings:

Settings → System → Reset → Reset Network Settings

Table: Differences in settings SIM-maps on different versions MIUI

If you have a version MIUI not listed in the table, check the relevance of the firmware in the Settings section → The phone. → System updates. Sometimes setup problems. SIM-Cards are resolved after updating.

Typical problems with change SIM-Default cards and their solutions

Even after setting up correctly, Xiaomi users often encounter bugs, and here are the most common ones and ways to fix them:

• 📵 Mobile Internet does not work on the selected SIM: Check if Mobile Internet is enabled in quick settings. If yes, go to Settings. → SIM-map → [yours SIM] → Network type and select 4G (If this does not help, try to manually ask APN: Settings → SIM-map → [yours SIM] → Access points (APN) → Reset to standard
• 🔕 Calls are coming from the wrong person. SIM: Make sure that the contact settings do not prioritize the other. SIM. Open the contact, click Edit and check the field SIM-Default card. Also try to disable Smart Choice. SIM (if there's one in your firmware).
• ⚠️ After the reboot, the settings are reset: This is a known bug MIUI, Solution: Turn off optimization for the application Settings: Settings → Annexes → Application management → Settings → Battery → No restrictions.

Attention, if after the shift SIM-The default cards stopped coming SMS from a bank or services (such as confirmations from Sberbank or Telegram), check if the Security app blocks them. → Annexes → Permits → SMS Make sure the right apps have access to the messages.

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How to reset the settings SIM-factory-card

If after all the manipulations SIM-The cards are not working properly (e.g., the phone doesn't see the network or switches between cards), and resetting may help, and it won't delete your data (photos, contacts), but it will return all network settings to factory settings.

Follow the following steps:

1. Open Settings → System → Reset.
2. Select Reset Network Settings (not to be confused with Reset All Settings!).
3. Confirm the action by entering a password (if installed).
4. After restarting, reset the SIM-default-card.

If the reset doesn't help, try reinstalling SIM-Physically: Turn off the phone, remove the tray, swap the cards (SIM 1 ↔ SIM 2) and paste back. Sometimes this solves the problem of prioritization.

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FAQ: Frequent questions about change SIM-maps on Xiaomi