How to appoint SIM-Default card on Xiaomi smartphones: full instructions

Xiaomi’s modern smartphones support two SIM-But not all users know how to properly configure a priority SIM for calls, messages or mobile Internet. Errors in settings can lead to outgoing calls coming from the wrong number, and SMS This is especially true for owners of Redmi Note 12, POCO X5 Other popular models with hybrid slots.

In this article, we will discuss all the ways of appointment. SIM-Default cards on Xiaomi smartphones under control MIUI 12-14, including hidden settings for older firmware versions, learn how to prioritize different types of connections, what to do if the option is inactive, and how to avoid common errors when setting up two sims.

Before you start setting up, make sure that both SIM-The cards are correctly installed in the tray and recognized by the system. If one of the SIMs is not identified, check it on another device or reinstall it in a slot. 13/14 redmi K60 Used combined slot nanoSIM + nanoSIM/microSD, Therefore, priority may depend on the physical location of the card.

It is important to understand that the default settings apply only to outgoing calls and messages. Incoming calls and SMS will arrive on both SIMs regardless of priorities. If you need to completely disable one of the cards, this is done in a separate SIM management menu.

1. Standard method: setting through "Parameters" SIM-map»

The easiest way to determine the basic SIM-Map - Use the built-in menu MIUI. This method works on all current versions of the firmware, including MIUI 14 for Xiaomi 13 Ultra and Redmi Note 12 Pro+.

Open the Settings app (cog icon) and go to the section:

→ SIM-maps and mobile networks →Parameters SIM-maps

Here you will see a list of installed cards (for example, SIM 1 and SIM 2), tap the desired SIM to open its settings.

Every menu. SIM-The following options are available for maps:

• 📞 Default calls – Selects a SIM for outgoing calls.
• 💬 Default Messages – Set Priority for Sending SMS.
• 🌐 Mobile data – activates the Internet on the selected SIM.
• 🔄 4G/5G (Preferably, configures network priority (not available on all models).

If the default call option is inactive, it means that you are currently in DSDS (Dual SIM Dual Standby) mode, where both SIMs are active simultaneously, in which case you can only prioritize a specific action (call or SMS) at the time of execution.

2. Quick shift. SIM-cards when calling or sending SMS

Even if you have assigned a primary SIM in your settings, MIUI allows you to instantly switch between cards when making a call or sending a message, a feature that is useful if you need to temporarily use another number without changing the global settings.

When making an outgoing call:

1. Open the phone app and enter the number.
2. Next to the call button will appear the icon of the current SIM-maps, for example, SIM 1).
3. Slip the icon to select another SIM from the list.

Sending an SMS works in the same way:

• 📝 In the application "Messages" create a new SMS.
• 🔄 In the upper panel, click on the current one. SIM-map (e.g. send with SIM 2).
• 📲 Select an alternative SIM from the drop-down menu.

This method does not change the default settings, but only redefines them for the current action, and after the smartphone is rebooted, the priorities will return to their original values.

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If you often call from different SIMs, add the widget “Quick Settings” SIM» To do this, press the empty space on the screen. → «Widgets» → find «SIM-“Cards” and drag it to a convenient place.

3. setting up mobile Internet for each SIM-map

By default, mobile data is only activated on one SIM-If you need to use the Internet from another SIM (for example, to save traffic or roaming), follow the following steps:

Go to:

→ SIM-maps and mobile networks → Mobile data settings

Here you will see the “Mobile Data” switch and the list of available SIM-Activate the slider in front of the desired SIM.

Pay attention to the following nuances:

• 📶 Simultaneous Internet: On most Xiaomi models (except for the flagships with Dual) 5G) Mobile data only works on one SIM, and when you activate the Internet on the second card, the first one will turn off.
• 🔄 Auto-switching: Some firmwares have an option called “Automatic Selection” (e.g., in the MIUI 13 for Xiaomi 12), which switches the internet to a SIM with the best signal.
• ⚡ Energy consumption: Using mobile data on two sims at the same time (where supported) increases battery consumption by 15-20%.

If messengers or push notifications stopped working after changing the SIM for the Internet, check the APN settings.

Settings → SIM- Maps and Mobile Networks → [Select SIM] → Access Points (APN)

Make sure you select the correct operator profile (usually it is automatically loaded).

4.Sharing priorities: calls on one SIM, Internet on another

Many users want to use one of them. SIM-A call card, and the other one is for mobile Internet. MIUI This is implemented through a combination of settings in the menu "Parameters" SIM-map».

Example configuration for the Redmi Note 11 Pro+:

1. Assign SIM 1 as “Default Calls” and “Default Messages.”
2. Activate Mobile Data for SIM 2 only.
3. Turn off the “Enable 4G/5G” option for SIM 1, if you don’t need high-speed data on it.

This arrangement allows:

• 📱 Save battery power, as only one SIM is running in mode LTE/5G.
• 💰 Split costs: for example, use a cheap tariff for the Internet and a corporate SIM for calls.
• 🌍 Avoid roaming on the main SIM while traveling.

However, there are limitations:

⚠️ Attention: If SIM 2 (with the Internet) not activated service "Calls on" 4G» (VoLTE, incoming calls to it will be unavailable as long as the mobile data is turned on. SIM 1.

Is the primary SIM assigned to calls?|Activated mobile data on the desired SIM?|Activated settings APN?|Activated VoLTE (if you need Internet + calls on one SIM)||Activated on the SIM

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5. Hidden settings for older versions of MIUI (up to 12th)

On smartphones with MIUI 11 and earlier versions (e.g. Redmi Note 8 Pro or Mi) 9T) interface SIM-In some cases, the default SIM assignment option is hidden in the engineering menu.

To access the advanced settings:

1. Open the Phone app and enter the code: ##4636###
2. Go to the “Phone Information” section (or “Phone Information”).
3. Scroll down to the “Set preferred network type” block and select the desired one. SIM-map.

The engineering menu also allows you to force VoLTE or VoWiFi to be enabled for a specific SIM if these options are not available in the standard settings.

⚠️ Attention: Incorrect changes to the engineering menu can cause mobile communication to crash. Do not change parameters whose purpose you do not know. For example, editing Band Mode values without knowing the operator's frequencies can leave you without a network.

For Qualcomm Snapdragon-based models (e.g., POCO F3), there is an alternative code to access the SIM settings:

##2263##

It opens the Band Selection menu, where you can manually select the priority frequencies for each SIM.

6. Problem Solving: Why SIM Settings Are Not Saved

Sometimes users are faced with the fact that the assigned default SIM-The card is reset after restarting or updating the firmware:

Common mistakes and their solutions:

If the problem persists, try resetting your network settings:

→ SIM-maps and mobile networks → Network reset

This operation will delete all stored Wi-Fi networks and mobile connection settings, but will not affect personal data.

Dual 5G models (such as the Xiaomi 12 Pro or Redmi K50 Ultra) may require additional setup in the Network Mode menu. Make sure that both Sims are selected with 5G/4G/3G/2G (auto) or the priorities may not work properly.

7. Alternative methods: management applications SIM-map

If you don't like the standard MIUI settings, you can use third-party utilities that offer advanced features such as automatic schedule switching or geolocation.

Popular applications for working with two SIM-map:

• 🔄 Dual SIM Selector – allows you to assign different SIMs for different contacts.
• 📡 SIM Toolkit - manages USSD-operator codes and services.
• 🕒 Auto SIM Switcher – automatically switches SIMs by time or location.

Before installing, check the app’s compatibility with your Xiaomi model.Some utilities require root rights, which can compromise the device’s warranty and security.

Example of the Dual SIM Selector:

1. Install the app from Google Play.
2. Give permissions to access calls and SMS.
3. In the main menu, select “Default Settings” and assign priority SIMs for each type of connection.
4. Activate the option to “Show SIM Selection Dialogue” for manual switching.

One of the key benefits of third-party apps is that you can link a SIM to a specific contact, for example, all calls to your mom will be with SIM 1, and to your coworkers with SIM 2, a feature that is not available in standard MIUI firmware.

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Third-party management applications SIM-Maps may conflict with system services. Before installation, back up your settings in Settings → The phone. → Backup.

FAQ: Frequent questions about setting up SIM-maps on Xiaomi