How fast to switch SIM-maps on Xiaomi Mi9: way + Dual tips SIM

Why Xiaomi? Mi9 tricky-to-switch SIM-Maps - and how to fix it

Xiaomi Mi9 is one of the first flagships of the brand with support for Dual SIM Dual Standby (DSDS), but not all users know how to correctly manage two SIMs. The problems begin with the fact that the slot is hybrid: either two nano-SIMs, or one SIM + microSD card. And if you still do not know where to look for switching settings, you risk missing important calls to the second number.

In this article, we will discuss all the ways to switch SIM-map Mi9 — From the basic method through the notification bar to the hidden settings for forced network selection, and we'll also tell you why sometimes the network disappears after changing the SIM and how to fix it without resetting the phone.

Spoiler: If you have a MIUI version below 12.5, there's no separate "Mobile Network" option for each SIM in the settings, so you'll have to use workarounds.

Method 1: Quickly switch over notification panel

The most obvious and quickest method is to use a notification curtain, which works on all versions of MIUI, but with nuances:

• 📱 Swipe down from the top edge of the screen to open the notification bar.
• 🔄 Find the Mobile Data icon (usually next to Wi-Fi and Bluetooth).
• 📶 Press and hold this icon. 1-2 Seconds – the selection menu will open SIM-map.
• 🎯 Slip on the SIM to activate it for data transfer.

⚠️ Note: This method does not disable the second SIM — It will remain active for calls and SMS. To completely deactivate one of the sims, you need to go to the settings (see Method 2).

If there is no mobile data icon in the curtain, it means:

• 🔧 You have your mobile data disabled (check Settings) → SIM-maps and mobile networks).
• 📵 Phone in the mode "In the plane" (aircraft icon in the status line).
• 🔄 Version. MIUI 12.0+ - Update the firmware.

💡

If the mobile data icon in the curtain is gray and inactive, try rebooting the phone, which sometimes helps to return control of the SIMs after a crash.

Method 2: Complete control SIM-card-wise

For fine-tuning (disabling the SIM, network selection, priority calls) you need to go to the Settings menu. → SIM-Maps and mobile networks. Here's what you can do:

1. Shut down. SIM-Map: Tap the name of the SIMKI (for example, "China Mobile" or "MTS") → Translate the slider Include this one SIM-map off..
2. Set the priority of calls: In the section Choice SIM-Call cards, choose which SIM to use by default, which will come in handy if you have different rates for outbound.
3. Manually select network: Click Network Choice → Turn off Automatic Choice → wait for the list of available carriers. Useful if the phone doesn't catch 4G on one of the SIMs.

⚠️ Warning: If the Internet goes missing after manually selecting the network, go back to automatic mode. Mi9 s MIUI 11 and below are sometimes confused settings APN — In this case, you will have to enter them manually (instructions in the next section).

Check the IMEI SIM card (type *#06#)

Write down the name of the operator and the type of network (2G/3G/4G).

Make sure that SIM-card not blocked PUK-code

Restart your phone before changing your settings-->

Method 3: Physical Replacement SIM-cards (if the slot is hybrid)

If you have a hybrid slot (one nano-SIM + microSD or two nano-SIMs), you have to turn off your phone to replace the SIM. Here's how to do it safely:

1. Turn off the Xiaomi Mi9: Press the power button → select Turn off. Don't pull the SIM on hot - it can damage the slot contacts.
2. Change the SIMs: Put the nano-SIM contacts down (the skeet should match the shape of the tray). If you use a microSD, the second SIM will not fit.

⚠️ Attention: Mi9 The second SIM slot (if there is no microSD) supports only nano-SIM. If you try to insert a micro-SIM with the edges cut off, the phone will not recognize it or damage the contacts.

Once a week |Only when traveling |I use two SIMs |I never switch-->

Dual SIM Problems on Xiaomi Mi9 and Their Solutions

Even after switching the SIMs correctly, Mi9 users face typical problems, and here are the most common ways to fix them:

1. the network on one of the SIMs is lost

Reason: Conflict between carriers (for example, if both are operating in 4G band) or a failure in APN settings.

Decision:

• 🔧 Go to Settings. → SIM-maps and mobile networks → [choose SIM] → Access points (APN).
• 📝 Delete all the saved ones. APN and add a new one manually (options can be taken on the operator's website).
• 🔄 Reboot the phone.

2.The Internet does not work on the second SIM.

Reason: On the Mi9, the second SIM (if the slot is hybrid) may not support 4G if a microSD is inserted.

Decision:

• 📱 Remove the memory card and check if it appears. 4G.
• 🔄 In the settings SIM Select Only. 3G for the second sim (if) 4G not available).

3. Calls only come to one SIM

Reason: Call priority is not set correctly.

Decision:

• 📞 Go to Settings. → SIM-maps and mobile networks → Choice SIM-call-card.
• 🔄 Always ask to select a SIM at every call.

💡

If you lose your Dual SIM settings after the MIUI update, reset your network: Settings → About Phone → Network Reset. This will return factory connection settings without losing data.

How to set up an APN to work properly with two SIMs

If the mobile Internet is not working after switching the sims, the APN (Access Point Name) settings are likely to be lost. On the Xiaomi Mi9, you can restore them as follows:

1. Open the Settings. → SIM-maps and mobile networks.
2. Choose a problem SIM-map → Access points (APN).
3. Click on the three dots in the upper right corner → Reset to default values.
4. If this does not help, add APN manually (example for MTS): Name: MTS INTERNET APN: internet.mts.ru Username: mts Password: mts Authentication Type: PAP or CHAP APN Protocol: IPv4/IPv6

⚠️ Attention: After manual input APN Save the settings and restart the phone. If the Internet doesn't work, check if the firewall is blocking it. MIUI (Turn it off in Settings → Annexes → Permits → firewall).

Hidden Dual SIM features on Xiaomi Mi9

Few people know, but MIUI has hidden settings for advanced SIM control to activate them:

• 🔧 Enter the dialer code: ##4636## This will open the Testing menu.
• 📊 Select Phone Information → Scroll down to the Set Preferred Network Type block.
• 🔄 You can manually prioritize each network. SIM (for example, forced LTE for the first SIM and 3G second).

⚠️ Warning: Do not change the settings in this menu unless you are sure they are important. Incorrect settings can cause network loss or modem overheating.

Another life hack: If you need to quickly switch to another SIM to call without going into the settings, use the Google Assistant voice assistant.

"OK, Google, call your mom with SIM-2."

The phone will automatically prompt you to select a SIM before calling.

FAQ: Frequent questions about switching SIM to Xiaomi Mi9