How to switch SIM-Xiaomi cards: all ways for models with 1 and 2 slots

Introduction: Why switch? SIM-Xiaomi cards and when necessary

Xiaomi smartphones support one or two of them SIM-By using cards, which allow you to separate personal and work numbers, use advantageous fares of different operators or travel without roaming. SIM-cards, especially if one of them suddenly stopped catching the network or you need to urgently activate another number for calls.

There are many situations when you need to change an active SIM, from the banal “does not catch the network” to the need to temporarily disable one card to save battery power. In this article, we will analyze all the current ways to switch, from standard settings to hidden MIUI functions, and also tell you how to avoid typical errors that cause a smartphone to lose communication or start “glugging”.

Special attention will be paid to models with a hybrid slot (for example, Redmi Note 12 Pro+ or POCO X5 Pro), where the second slot is combined with a memory card connector, where switching requires additional manipulations that most users do not even know.

Method 1: Switching through the notification panel (fast method)

The easiest way to change SIM-A call card or mobile Internet card, using a quick settings panel, works on all Xiaomi smartphones running the same system. MIUI 12-14 and takes no more than 5 seconds.

Instructions:

• 📱 Swipe down from the top of the screen to open the notification bar.
• 🔍 Find the icon «SIM-maps" (usually displayed as two crossed cards or an antenna with numbers 1/2).
• 🔄 Slip on the icon - the selection menu will open. SIM for calls and mobile data.
• 🎯 Select the card for each type of communication (you can assign different cards). SIM for calls and the Internet).

If the icons «SIM-There's no map on the panel, so it's hidden:

1. Open the notification panel and tap the icon «⚙️» (or “Edit»).
2. Find it on the list «SIM-Maps and drag it to the active area.

💡

If the Internet is lost after switching, check whether data transfer for the selected SIM is activated in the Mobile Network → Data Transfer settings.

Method 2: Configure via the menu «SIM-maps and mobile networks»

For more flexible settings (for example, if you need to disable one) SIM-map completely or set network priority) use the basic smartphone settings. This method is suitable for all models, including Xiaomi 13T, Redmi A2+ and POCO F5.

Step-by-step:

1. Open Settings (the gear icon on the main screen).
2. Go to the SIM-cards and mobile networks section (on some firmwares, the Mobile Network may be called).
3. Select the item Name SIM-maps or management SIM-map.
4. Put it on the right foot. SIM and set the parameters: 📞 Calls - pick one. SIM for outgoing calls. 🌐 Mobile data – assign a map to the internet. 📶 4G/5G — Please specify network priority (if supported). ⚡ Turn on/off - deactivate SIM, if not used.

After the changes, the smartphone may request a reboot, which is normal. If the reboot didn't help, check if it's inserted correctly. SIM-map in the tray (more about this in the next section).

Is the flight mode turned on (turn it off)

Is there a network on both SIMs (check signal indicators)

Does the antivirus block access to SIM settings?

Is the firmware updated to the latest version?-->

Method 3: Switching for hybrid slot models (SIM + microSD)

Many Xiaomi smartphones (such as the Redmi Note 11 or POCO M4 Pro) feature a hybrid slot where the second connector is paired with a memory card nest, where switching the SIM requires caution: if you pull the tray out incorrectly, you can damage contacts or lose data from the microSD.

Algorithm of action:

1. Turn off your smartphone (required!) Removing the tray on the device on could cause a failure.
2. Take a paper clip or a special key (comes in the kit) and gently press the tray hole.
3. Get the tray and: 🔄 If you need to change SIM: Replace the card in slot 1 or 2 (make sure the contacts are clean). 💾 If you need a microSD, insert a memory card instead of the second one. SIM (But remember that in this case, the slot for the second SIM will be blocked!).

Insert the tray back before the click and turn on the phone.

After turning on, the smartphone can automatically identify new ones. SIM-cards, but sometimes manual adjustment is required (see Method 2). SIM It's not recognized, try it:

• 🧹 Wipe the contacts of the card and tray with alcohol.
• 🔄 Replace. SIM In the other slot (if both support nano-SIM).
• 📱 Update the firmware through Settings → The phone. → Updating the system.

Method 4: Use USSD-command SIM

Few people know, but some of the operations with SIM-maps can be performed through USSD-commands are short codes that are sent to the operator, which is convenient if you need to quickly check the balance, activate the package or switch the main one. SIM for outgoing calls.

Examples of commands (may vary depending on operator):

To send USSD-team SIM:

1. Open the Phone app.
2. Go to the keyboard tab.
3. Enter a command (e.g. *100#).
4. Click on the SIM icon next to the call button and select the card you want.
5. Slip the call.

It's important: USSD-Teams are only active for the purpose of SIM-If the team fails, check if it's blocked. SIM the operator (for example, due to debts).

Once a week.

Only on trips.

Never switch.

Forgot I had two. SIM-->

Common Mistakes and How to Avoid Them

When switching SIM-And these are the most common mistakes and the ways that people can solve them:

⚠️ Attention: If after switching SIM The Internet is gone, don't be quick to blame the operator. First, check if the mode is activated. 2G» This mode limits speed and can block 4G/5G.

Error 1: The smartphone does not see the second SIM after the reboot.

Reason: The slot is faulty or the SIM is inserted incorrectly.

Decision:

• 🔧 Replace it. SIM In the other slot (if both support nano-SIM).
• 🛠️ Check the tray for damage (sometimes plastic latches break).
• 📱 Reset network settings in Settings → SIM-map → Resetting settings.

Error 2: You can’t call with one SIM, even though it’s active.

Reason: The default setting prohibits outgoing calls for this card.

Decision:

• 📞 Go to Settings. → SIM-map → Call settings.
• 🔄 Make sure that the right call is selected for outgoing calls. SIM.
• 🔒 Check if the number is blocked by the operator (dial *111# for diagnostics).

Error 3: The battery goes down quickly after the second SIM is activated.

The reason: Two SIMs scan networks simultaneously, increasing the load on the communication module.

Decision:

• ⚡ Disable Network Search for Unused SIM In Settings → SIM-map → Searching the net.
• 📵 Enable the charge saving mode for the second SIM (if there is such an option).
• 🔄 Reboot your smartphone – sometimes it resets unnecessary processes.

💡

If the SIM doesn't work after all the manipulations, try it on another phone, and if it doesn't, it's in the card, not the smartphone.

Additional features: Dual SIM Dual Standby (DSDS) and VoLTE

Xiaomi’s dual-SIM smartphones support Dual SIM Dual Standby (DSDSDS) technology, which allows both cards to remain active at the same time.

How DSDS works:

• 📶 Both SIM They can take calls, but if one is busy, the other will be unavailable.
• 🌐 Mobile Internet is only available on one SIM (selectable).
• ⚡ In mode. DSDS The battery is consumed faster (by 10-15% compared to one) SIM).

For owners of Xiaomi with VoLTE support (voice over 4G), additional options are available:

• 🎤 VoLTE calls can only be made with one SIM (adjusting to the settings → SIM-map → VoLTE challenge).
• 📶 If VoLTE does not work, check whether your operator supports this function (MegaFon and MTS it is activated by default, Tele2 only on some tariffs).

To enable VoLTE:

1. Go to Settings. → SIM-maps and mobile networks.
2. Choose. SIM-The card you want to activate VoLTE for.
3. Enable the VoLTE Call Switch (or Improved Calls).
4. Reboot your smartphone.

If VoLTE is not on the menu, your model or firmware does not support it. Check the list of compatible devices on the carrier's website.

FAQ: Frequent questions about switching SIM to Xiaomi