Owners of modern Xiaomi smartphones often face the need to use two or more SIM cards at the same time, this can be the separation of personal and work contacts or use different tariff plans to save on calls and the Internet. However, the standard logic of the MIUI or HyperOS system is not always obvious to beginners, especially when it comes to choosing a specific communication channel for outgoing messages.
To make matters worse, menu interfaces can vary depending on the shell version and the firmware region, and users often find that the message is not coming from the map they intended, or that the system asks each time they choose a number, which is annoying when they are actively texting, and that prioritizing the message correctly automates the process and avoids unnecessary actions.
In this guide, we will take a look at all the nuances of managing SIM cards on Xiaomi devices, learn how to fix a certain SMS default, how to quickly change the choice in the dialogue, and what to do if the settings do not apply. Understanding these mechanisms will help you effectively manage communication without constantly interfering with system parameters.
Basic principles of two SIM cards in MIUI
The MIUI shell, which is installed on Xiaomi, Redmi and POCO smartphones, has its own multisim processing logic. Unlike pure Android, it has additional filters and personalization capabilities for each slot, and it separates the streams of data, voice calls and text messages, allowing them to assign independent rules for them.
When you first install a SIM card, your smartphone will automatically suggest you assign one to the mobile Internet and voice service, but SMS messages often have Always Ask mode or the default card that was set first, and changing this behavior requires manual intervention.
It's important to understand that settings can be applied globally to all contacts or individually, which means that you can configure texting to mom always from one SIM and to the service provider from another if the system supports a context menu, and the interface's adaptability allows you to flexibly manage these parameters.
Global SIM Priority SIM Configurement for SMS
The most common scenario is when the user needs all outgoing messages to leave by default through a specific number, which eliminates the need to select a SIM card each time you type, and to implement this, you need to refer to the system settings of the device.
Go to the settings menu and find the section that manages SIM cards. It may be called differently in different versions of firmware, but it's usually the item Two. SIM-maps and mobile networks or SIM-Maps and mobile networks. That's where all the key connectivity parameters are.
☑️ Setting priority of the SMS
Inside this menu, you'll see the default settings block, and you'll find the default text line or the default text line, and you'll click on it and you'll find the list of available SIM cards, and you'll select the one you're going to use most often for text communication.
⚠️ Note: After the global priority shift, some messenger apps may continue to use the old SIM card for verification if they cache this setting.
If you don't find one on the menu, try searching by settings, type in the word "SMS" or "SMS" and the system will highlight the section you want to see, especially for newer versions of HyperOS, where the menu structure has been significantly redesigned.
Selecting a SIM card in a specific dialogue
Often, global settings are not appropriate for the specific case, for example, you have to respond to a message from a work number, although the default is a personal one, and you don't have to go deep into the system settings, you just need to use a quick switch.
When you open a new message or response window in an existing dialog, look at the text input box or send button. In the standard Google Messages app or the system MIUI Messaging, the current SIM card icon is often displayed next to the send button or above the input field.
- 📱 Click on the SIM card icon to call up the selection pop-up menu.
- 🔄 Select an alternative number from the list before sending.
- ✅ Send a message, it will leave exactly from the number chosen this time.
Some firmware versions allow you to pin the choice of SIM card for a particular contact, and you need to open a dialog with the subscriber, click on the menu (three dots) and find the item "Send with" or "Use for SMS." By choosing the right SIM, you will create a rule that will only apply to that person.
What to do if the SIM button is missing?
This is a great way to be flexible, not just by being tied to one number, but by not wasting time switching the menu, and contextual management makes messaging much faster in the rhythm of modern life.
Use of third-party applications for SMS
Google’s standard Messages app, which is now the main app on most global versions of Xiaomi, has its own peculiarities: it may not always display SIM card selection correctly if the system has accumulated a conflict of settings, in which cases users often turn to alternative solutions.
Popular applications like Textra, QKSMS, or Microsoft SMS Organizer provide a more advanced SIM management interface, which allows you to create rules, such as "if you have the word 'work' in the text, send from the SIM 2," a level of automation that is not available in stock solutions.
| Annex | SIM management | Planner | Price. |
|---|---|---|---|
| Google Messages | Basic | No. | Free of charge. |
| Textra SMS | Expanded | There is. | Freemium |
| QKSMS | Flexible. | There is. | Free of charge. |
| Microsoft Organizer | Standard. | No. | Free of charge. |
When installing third-party software, Xiaomi will request permission to use it as the default SMS application. Agree to this so that the new settings take effect. The old application will no longer receive notifications of new messages, but the correspondence history is usually saved and available for import.
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Use third-party launchers for messages if you need automatic sorting of SMS from banks and delivery services, which will unload the main list of incoming and help you find the right dialogues faster.
Solving problems with sending messages
Even when set up correctly, there can be situations where SMS is not sent or leaving the wrong card, most often the problem is an unstable network signal or a temporary failure in the communication module, the first step should always be to check the balance and status of the network.
If you see that the message is "hanging" in the sending status, try to switch the network mode. → SIM-maps and mobile networks → Select a SIM card. → Network type. Switching from 5G/LTE on 3G/2G And back again, it can reconnect the device to the tower and start a message queue.
⚠️ Note: If messages stop leaving after updating the firmware, check the permissions of the Messages app.Perhaps after the update, the system revoked the rights to access contacts or phone, which blocks the sending of the message.
Also worth checking is there a lock for the selected SIM card. In some regions or tariffs, operators can block outgoing SMS if there is a negative balance or if there is a suspicion of spam mailing.
In rare cases, resetting your network settings helps, not to delete your personal data, photos or contacts, but to return all network settings (Wi-Fi passwords, Bluetooth settings and other data). APN) To the factory values. To the function: Settings → Connection and sharing → Reset Wi-Fi, mobile networks and Bluetooth.
Features of work in HyperOS mode
With the release of the HyperOS operating system, Xiaomi began to change the logic of user interaction. the interface became more minimalistic, and some functions were hidden in the submenu or renamed.
In the new shell, SIM card management is often put into widgets or the top curtain of notifications. When you are actively using the Internet or a call, the system can dynamically suggest switching the SIM card for SMS if the current one is busy with voice calls (in case you have only one radio module or it does not support VoLTE simultaneously with data).
- 🚀 Accelerated Launch: Network Settings Boot Faster.
- 🛡️ Security: Improved control over SMS filter permissions.
- 🎨 Design: SIM card selection icons have become more visible and colorful.
Users who upgraded from MIUI 14 to HyperOS are encouraged to recheck their default settings, the system may have reset preferences to Always Ask for security or compatibility, and it is critical to recheck this item immediately after the updated smartphone is first turned on.
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With HyperOS, SIM card management has become more intelligent, but requires initial manual calibration by the user for a comfortable experience.