How to turn on the second SIM-Map on Xiaomi: All ways + mistake-making

Two. SIM-cards in one smartphone are no longer a luxury, but a necessity for many users. - Xiaomi smartphones (including the Redmi line, POCO and Mi support Dual SIM Now, for over 10 years, owners still have problems activating the second SIM, so that the phone doesn't see the map, there's no network, there's no way to switch between operators, and this article will help you understand everything from basic setup to solving rare bugs.

We will look at not only the standard way to enable via Settings, but also alternative methods for cases where the slot is not recognized. Separately, we will focus on the features of hybrid slots (where the second SIM competes with the memory card), as well as how to properly set the priorities of calls and mobile Internet. If your Xiaomi refuses to see the second SIM, here you will find proven solutions, including resetting network settings and checking IMEI.

All instructions are valid for MIUI 12/13/14 and HyperOS (2026), but most of the steps are good for older firmware versions, so for convenience, we've divided the material into blocks by problem type -- pick your case and follow the step-by-step guide.

1. Check the support of Dual SIM with your Xiaomi model

Before you try to activate a second SIM, make sure your smartphone supports this feature at all. Not all Xiaomi models come with two physical slots - some have a hybrid slot (SIM + microSD), and some (for example, Xiaomi 12S Ultra) and even single-SIM.

How to check:

• 🔍 Official website: Find your model at mi.com → section “Specifications" → point SIM Look for the Dual sign. SIM, Hybrid Dual SIM or Dual Nano-SIM.
• 📦 Box/documentation: The sticker at the back of the box usually indicates the type of supported SIM-map.
• 🛠️ Visual inspection: Get the tray out for SIM-If you have two separate slots under the nano-SIM, you have a full-fledged Dual. SIM. If one slot is combined with a microSD, it is a hybrid slot.

Features of hybrid slots:

• ⚠️ Second second SIM And the memory card can't work at the same time, so you have to choose between two SIMs or one SIM. + memory.
• 🔄 On some models (for example, Redmi Note 10 Pro) hybrid slot supports only 4G second SIM, Even if the main one is working in 5G.
• 📡 In smartphones with 5G Dual SIM (for example, Xiaomi 13T Pro) both SIMs can use networks simultaneously 5G, But it depends on the operator.

⚠️ Note: If you are using a hybrid slot, before installing the second one SIM Make sure to remove the memory card, otherwise the smartphone may not recognize the new SIM or damage the data on the microSD.

2. Standard way to enable the second SIM through settings

If your Xiaomi supports Dual SIM but the second card is not activated, follow this instruction.The process is the same for most models on MIUI and HyperOS:

1. Set up the second. SIM-The card is in the tray and put it back in the smartphone. Make sure the contacts of the card match the contacts in the slot.
2. Turn on the phone (if it was turned off) and wait for the system to boot.
3. Open the Settings app (the gear icon on the desktop).
4. Go to section. SIM-Maps and mobile networks (some firmware may call it a Mobile Network or Dual Network). SIM).
5. Click on the title two. SIM-maps (usually marked as SIM 2 or by the operator's name or).
6. Activate the switch Turn on SIM-card (if it is turned off).
7. Select Network Type (recommended 4G/3G/2G (auto) for stable operation).

After activation, check:

• 📶 Network indicator: Two operator icons must be displayed in the status bar (e.g., "MTS" and "Beeline").
• 📞 Calls: Try calling from each SIM (use the dial menu to select).
• 🌐 Internet: Make sure that mobile data is working SIM (settings → SIM-map → Mobile Internet).

⚠️ Note: If the second activation SIM It shows "No Network" or "Only Emergency Calls," don't panic. Give your phone 1-2 minutes to search for the network. If the problem persists, go to "Problem Solving".

Make sure that SIM-card activated by the operator|

Check the compatibility of Xiaomi model with Dual SIM|

Insert the card with the correct side (chip down) |

Restart the phone after installation SIM|-->

Setting priorities: calls, SMS and mobile Internet

One of the key features of the Dual SIM on Xiaomi is its flexible priority management, so you can choose which SIM to use for calls, SMS and mobile Internet by default, which is especially useful if one card is working and the other is personal.

How to set up:

1. Open the Settings. → SIM-maps and mobile networks.
2. Select the Priority item SIM-maps (or call settings on new firmware).
3. Set preferences: Calls: Select SIM for outbound calls by default (you can change each time you call). SMS: Specify SIM for sending messages. Mobile data: Select SIM for the Internet (important for saving traffic).

Always ask

Additional settings:

• 🔄 Network switching: In the Mobile Network section, you can turn off automatic network selection and manually specify your preferred operator (useful in roaming).
• 📵 On the plane mode: Xiaomi can only turn off one SIM, leaving the second active (in the flight mode settings).
• 🔋 Savings in charge: If you do not use the second SIM permanently, turn it off in the settings - this will reduce battery consumption by 5-10%.

Example of use case:

• 💼 Working SIM: Basic for calls and SMS, Mobile Internet is disabled (traffic savings).
• 🎮 Personal. SIM: Mobile Internet for social networks and games, calls - on request.

💡

If you travel frequently, set your roaming settings separately for each SIM, for example, on one card you can turn off roaming completely, and on the second card you can leave only calls.

4 Problem Solving: Why the Second SIM Doesn't Work

If the second SIM-The map is not detected or is not captured by the network, and the reasons may be software or hardware.

4.1.The phone doesn't see the second. SIM-map

Symptoms: the settings show "No" SIM-"card "SIM-card not inserted".

What to do:

1. Take out the tray and check: 🔍 SIM-The card is inserted with the chip down (on most Xiaomi models, the chip must be facing the back of the phone). 🧹 Contacts SIM and clean (wipe with a liquor wipe if there is oxidation). 🔧 The tray is not bent and fits tightly into the slot (try inserting it from the other end).

Reboot the phone.

Check the SIM on another phone – if it doesn’t work, the carrier has a problem (the card may be blocked).

Settings → About the phone → System update

4.2 SIM is recognized, but no network

Symptoms: SIM settings are visible, but the status is "No network" or "Emergency Calls Only".

Decisions:

• 🔄 Manual Network Search: Open Settings → SIM-Maps and mobile networks. Choose problem networks. SIM → Network Selection. Automatically disable and manually select your operator.

Resetting network settings

Settings → Memory and backups → Resetting settings → Resetting network settings

This will remove all stored Wi-Fi and cellular settings, but often helps in crashes.

IMEI verification

If the slot is physically healthy, but the network does not catch, the second SIM may have lost the IMEI.

*#06#

If zeros or “unknown” are displayed instead of IMEI, recovery will be required (instruction in the next section).

Mistake 4.3 "SIM-card not supported"

This error occurs if:

• 🔒 SIM-The card is blocked by the operator (for example, due to non-payment).
• 🛡️ Protection against fraudsters is included (some operators block the security) SIM opportunistic).
• 📱 SIM archetype (2G) It is not supported by modern smartphones.

Decisions:

• 📞 Call the operator (from the other) SIM or phone number and check the status of the card.
• 🔄 Try updating your profile SIM through USSD-The team (for example, for MTS *111*1810#, Beeline — *110*181#).
• 🆕 Replace. SIM on the new in the cabin of the operator (modern nano-SIM with support) 4G/5G).