Xiaomi Redmi Note 9 is one of the most popular smartphones with support for two SIM-But not all users know how to set up a priority SIM for calls, messages or mobile Internet. By default, the system often chooses the first card installed, which is not always convenient: for example, if you have one SIM for work and the second for personal calls. In this article, we will discuss all the ways of changing SIM-Default cards, including hidden settings MIUI, which are not obvious at first glance.
It is important to understand that setting the priority SIM-cards affect not only outgoing calls, but also automatic connection to the mobile Internet, sending SMS If you recently purchased a Redmi Note 9 or just want to optimize the work of two cards, this guide will help to avoid typical errors and save time.
Why it's important to set up SIM-default-card
Many users mistakenly believe that the choice SIM-The default card is just a matter of convenience. It's actually a matter of setting up:
- 📞 Outgoing calls: If you don’t specify a priority SIM, the system will ask for a choice before each call, which is annoying with frequent conversations.
- 📶 Mobile Internet: without the right setup, the smartphone can connect to the network through the “wrong” SIM, which leads to unnecessary costs (for example, if one card has unlimited, and the other has an expensive tariff).
- 💬 SMS and MMS: Some banks and services link confirmations to the main SIM-If it's not selected correctly, you won't get access codes.
- 🔄 Automatic redirect: when configuring call forwarding, the system uses SIM-default card as the primary.
The Redmi Note 9 (as well as other Xiaomi smartphones with two SIMs) has three key options that can be customized separately:
⚠️ Note: If you use eSIM together with a physical SIM-And in the map, priority settings can be reset once you reboot. MIUI 12-14.
| Parameter | What controls | Consequences of improper setting |
|---|---|---|
| Calls. | What SIM to use for outgoing calls | Constant selection of SIM before calling or calls from the "wrong" card |
| SMS | What SIM to use to send messages | Sending errors or using a paid SIM instead of free |
| Mobile data | What SIM to Use for the Internet | Unexpected spending on mobile traffic or slow connection |
Method 1: Change SIM-Default cards through settings MIUI
The most obvious and universal method is to use a standard settings menu, which works on all versions of MIUI (11 to 14) and does not require additional applications.
- Open the Settings app (the gear icon on the desktop).
- Go to section. SIM-Maps and mobile networks (or two) SIM-maps and mobile network depending on the firmware version).
- Click on the SIM-card settings by default.
- Choose the right one. SIM-map for each parameter: 📞 Calls are the main sim for outgoing calls. 💬 SMS — text-box. 📶 Mobile data – a SIM for the Internet.
Ready.
Save.
If you have a firmware installed MIUI 13/14, The interface may be slightly different, instead of individual points for calls and SMS There will be a single switch. SIM-- A map:
Make sure both of you SIM-Cards are active in the Management section SIM-map
Reboot your smartphone after the changes
Check the Internet on the selected SIM through Speedtest
Send a test. SMS, to confirm the settings-->
After saving the settings, it is recommended to restart the smartphone so that the changes take effect. This is especially important if you change the device. SIM-mobile internet card – sometimes the system continues to use the old SIM before rebooting.
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If there is no item in the settings "SIM-Default cards, check if both SIMs are included in the Control section SIM-Sometimes the system hides this partition if one of the cards is deactivated.
Method 2: Quick change through the notification panel
Not everyone knows, but Redmi Note 9 can be quickly changed. SIM-The default card is directly from the notification bar without going into the settings. This method is convenient if you need to temporarily switch to another SIM (for example, for a single call).
Instructions:
- Swipe your finger down from the top of the screen to open the notification bar.
- Press and hold the Mobile Network icon (or SIM-If you have two active SIM cards).
- In the menu that opens, select the desired SIM-map: 📞 Calls. 📶 Mobile data
Close the panel – the changes will be applied automatically.
This method does not allow you to adjust SIM-map SMS, But it works instantly and doesn't require a restart. The main disadvantage is that after restarting the smartphone, the settings can reset (depending on the version). MIUI).
Once a week |Only when the tariff changes |I never change |I don't know what it is-->
⚠️ Note: On some custom firmware (e.g. Pixel Experience or LineageOS), the notification bar may not display options for SIM-In this case, use the first method.
Method 3: Use MIUI Launcher to switch quickly
If you have a standard launcher installed MIUI, There is another little-known way to change. SIM-The default card is via a desktop widget, which is convenient for those who often switch between SIMs.
How to set up:
- Press and hold the free space on the desktop, then select Widgets.
- Find the widget. SIM-Maps (or Mobile Network) and drag it to the screen.
- The widget will display both. SIM-Click on the one you want to make the main one.
- Select which functions it will be used for by default (calls, SMS, Internet).
Problems and mistakes in the change SIM-default-card
Even after setting it up properly, Redmi Note 9 users sometimes run into problems, and here are the most common ones and ways to solve them:
| Problem. | Possible cause | Decision |
|---|---|---|
| Settings are not saved after restarting | Misfunction of MIUI or conflict with custom firmware | Reset network settings in Settings → SIM-map → Resetting network settings |
| We can't choose. SIM-map SMS | Operator restriction or outdated version of MIUI | Update your firmware or contact the operator to verify service support |
| The Internet works through the “wrong” SIM | Mobile data cache or error in APN settings | Clear the cache in Settings → Applications → Application Management → Mobile Network |
If none of these methods worked, try resetting your network settings:
- Go to Settings. → SIM-maps and mobile networks.
- Select Network Settings Reset (or Wi-Fi, Mobile Network, and Bluetooth Reset).
- Confirm the action and restart the smartphone.
⚠️ Note: Network reset will remove all saved passwords from Wi-Fi and Bluetooth settings. Before performing this operation, make sure you have backups of important data, especially if you are using it. VPN corporate.
If the problem persists, check if yours is not yours. SIM-eSIM card. in this case, additional configuration may be required through the operator application (for example, MTS Connect or Beeline). SIM-manager).
Additional settings for experienced users
If standard methods do not suit you, you can use hidden functions. MIUI These are the ways that people want to be more flexible in managing things. SIM-map.
1.Use the USSD code to check current settings
To find out which SIM-The card is used by default for calls and SMS, take advantage USSD-team:
- 📱 To check the main SIM-Call cards: Enter ##4636## → Choose Phone Information → See the section of the Voice Communications.
- 💬 For verification SIM-card SMS: send out empty SMS to number 111 (for some operators) - the system will show which SIM is sent from.
These commands don’t work on all firmware, but they can help diagnose the problem.
2. Management applications SIM-map
If the standard MIUI settings do not suit you, you can install third-party apps from Google Play:
- 🔧 Dual SIM Selector – allows you to quickly switch between SIMs through notifications.
- 📊 SIM Card Manager – Extended settings for each SIM (including traffic restriction).
- 🔄 Auto SIM Switch – automatic switching of SIMs on schedule (useful for distinguishing between work and personal calls).
Check the reviews before installing – some apps may conflict with MIUI 14.
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Third-party management applications SIM-The card requires permission to access calls and SMS. Install them only from official sources (Google Play) and check for rights requests.
How to check if the settings are applied correctly
After the change SIM-Default cards are recommended to perform several checks to make sure the settings are correct:
- Test call: Call another number and check which SIM is calling from (displayed in the top panel during the call).
- SMS check: Send SMS to your second number or to a short operator number (e.g. 111 for Beeline).
- Mobile Internet test: Turn off Wi-Fi and check which SIM traffic is going through (you can use Speedtest or see the network icon in the notification panel).
Checking in settings
- Go to Settings. → SIM-maps and mobile networks and make sure that the selected SIMs are displayed as the main ones.
Now, when you call this number, the system will automatically use the tied SIM.