How to turn on the second SIM-Xiaomi map: A complete guide to error solutions

Why is the second SIM-Xiaomi card may not work – and how to fix it

You put two in. SIM-Maps of Xiaomi Redmi Note 12 or POCO X5 Pro, but the second one is stubbornly not catching the network? Or the phone does not "see" one of the SIMs at all? SIM — especially after updating MIUI 90 percent of the time, it's not because of a hardware failure, it's because of the wrong settings.

In this article, we will discuss all the ways to activate the second. SIM-cards on smartphones Xiaomi, Redmi and POCO — From basic checks to hidden functions MIUI. You'll find out how:

• 🔍 Check if your model supports two SIMs at the same time
• ⚙️ Set Network Priority for each card
• 📶 Fix the error "No service" or «SIM-map not found»
• 🔄 Switch between cards without rebooting
• 🚫 Avoid conflicts when using 4G/5G both-sided

Important: the instructions are current for MIUI 14 and later (including HyperOS), but most of the steps will work for older versions as well. If you have Xiaomi before 2018, check the support for Dual SIM in the model specifications - some budget devices (for example, Redmi 5A) work with only one active SIM.

Step 1: Checking the Dual SIM hardware support

Before you set up the software, make sure your smartphone physically supports two. SIM-Even if there are two slots in the tray, it does not guarantee simultaneous operation:

• 📱 Full Dual SIM — Both cards are active at the same time (e.g. Xiaomi 13 Pro, POCO F5).
• 🔄 Hybrid Dual SIM — The second slot is combined with microSD (priority is given to either a SIM or a memory card). 9A, POCO M4 Pro.
• ❌ Limited support – the second SIM works only for calls (no more) 4G/5G). Typical of older models (Mi) A1, Redmi 4X).

How do you check?

1. Remove the tray for SIM-maps and look at the markings: 🔢 SIM1 + SIM2 — full-time. 🔢 SIM1 + SIM2/microSD — hybrid.

Xiaomi

The model name + "Dual SIM support"

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If you have a hybrid slot (SIM2/microSD), before activating the second SIM, be sure to remove the memory card - otherwise the slot will not recognize SIM-map.

Step 2: Proper installation SIM-card-tray

It seems obvious that 30% of the problems with the second SIM are due to the wrong installation.

• 📏 nano-SIM (Smallest format – required for most Xiaomi models 2020 If you have a micro-SIM or a standard one, cut it or replace it in the cabin.
• 🔄 Switch slots: if the second SIM does not work in the SIM2, Try to put it in. SIM1, The first one is in the second slot. Sometimes the problem is the contacts of the particular connector.
• 🧲 Check the purity of contacts: wipe the copper pads on SIM-A dry wipe (no alcohol!) can block the signal from oxidation or dust.

After installation:

1. Reboot your phone (not just turn it off, but a full reboot).
2. Wait 1-2 minutes – finding a network can take time.
3. If a notification appears on the lock screen “New” SIM-map, click on it and follow the hints.

Step 3: Set up Dual SIM in MIUI/HyperOS

If the hardware is fine, but the second SIM still doesn't work, it's time to dig into the settings. → SIM-Maps and mobile networks and follow the instructions:

Turn on the switch next to SIM2|Select network type (2G/3G/4G/5G)|Set priority for calls |Set up an access point (APN) for the Internet |Reboot phone-->

Activation SIM-map

In the section SIM-You'll see two tabs -- one for each SIM. Click on the inactive (gray) and turn on the On switch. If there's no option:

• ⚠️ SIM-card is not recognized (check installation or replace the card).
• 🔒 SIM-card blocked PUK-code (you need to unlock through the operator).

2. Selection of network type

For each SIM, you can set the priority of the network:

• 📶 4G (Preferably for Internet and Calling (VoLTE).
• 📞 3G — if 4G Not catching (relevant to remote areas).
• 🏙️ Only 2G — Maximum battery savings (no internet calls).

⚠️ Note: If both SIMs are selected 4G, One of them can automatically switch to the 2G To avoid this, in the developer settings (Settings) → The phone. → Version. MIUI — tap 7 times) disable the option Limit background data for 2nd SIM.

3. Access Point Configurement (APN)

If the second SIM catches the network, but the Internet does not work, the problem is APN. Go to Settings. SIM-map → Access point (APN) and:

1. Select the SIM for which you are setting up the Internet.
2. Click Add APN and enter your operator’s settings (can be found on its website or in Google for “APN [operator name]”).
3. Save and restart the phone.

Step 4: Solving No Service Errors and «SIM-map not found»

If the second SIM is determined by the system but does not catch the network, try these methods:

• 🔄 Manual Network Search: Go to Settings → SIM-map → Search the network and select the operator manually. Sometimes the automatic mode will fail.
• 📵 In the plane mode: turn it on for 30 seconds, then turn it off.
• 🔧 Resetting network settings: Settings → SIM-map → Reset mobile network settings. Warning: after that, you'll have to re-enter your Wi-Fi passwords.
• 🔋 Verification IMEI: If the sim doesn't work after the firmware, it may have gone off IMEI. You can find it by command *#06#. If you want Null or Unknown instead of numbers, you need to restore it (instructions for your model look at the following: 4PDA).

If nothing helps, check:

• 💳 Balance and status SIM-card: sometimes the operator blocks the card for debts or for technical reasons.
• 📡 Coverage area: The second SIM may not catch the net in the basement or in the back of the ground, even if the first one is running.
• 🔄 Conflict with the first SIM: if both cards are from the same operator, try inserting SIMS of different providers.

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If the second SIM-The card stopped working after the update. MIUI, Try to roll back on the previous firmware version or wait for a patch. SIM correct in the following updates.

Step 5: Optimizing the two SIM-map

Both SIMs are active, but they're having problems, and here's how to make them work better.

• 📞 Priority for calls: in Settings → SIM-map → Priority SIM-Call cards, choose which SIM will be used by default. This is convenient if you have one card for work and another for personal calls.
• 🌐 Internet separation: if both SIMs support 4G, But the internet only works on one, go to Settings → SIM-map → Mobile Internet and choose which card will be the main data.
• 🔋 Battery savings: If you don’t need both SIMs all the time, turn off network search for the second in the background (Settings) → Battery → Optimizing the battery → Limit background activity for SIM2).

For models with HyperOS (for example, Xiaomi 14, Redmi K70) additional features are available:

• 🔒 Protection SIM-maps: can be installed PIN-code for each SIM separately.
• 📊 Traffic statistics: separate Internet accounting for each card.
• 🔄 Quick switch: swipe down the notification panel → tiles SIM-map → smack-up.

Step 6: Features for 5G and eSIM

If your Xiaomi supports 5G or eSIM, the Dual SIM setup has nuances:

For 5G:

• ⚡ Most of the models (Xiaomi) 13T, POCO F5 Pro) 5G It only works on one. SIM-The second one will be limited. 4G/3G.
• 🔧 To choose which SIM will be 5G, Go to Settings. → SIM-map → Network type and install 5G priority-card.
• 📡 If 5G Do not catch, check whether your operator supports this technology in your area (for example, MegaFon and MTS cover the technology). 5G only in the major cities).

For eSIM:

Xiaomi 12T Pro, Xiaomi 13 Lite and newer models support eSIM + physical SIM. To activate the second (virtual) SIM:

1. Get it. QR-code or data to activate from the operator (e.g. Tele2 or MTS).
2. Go to Settings. → SIM-map → Add a mobile network.
3. Select Download. SIM-map and scan QR or enter data manually.
4. Once activated, the eSIM will appear in the SIM list – configure it like a regular physical card.

⚠️ Note: Xiaomi with HyperOS when using eSIM + physical SIM There may be a conflict when rebooting (one of the cards “flys”), in which case resetting the network settings or flashing the flashing will help.

Frequent questions about Dual SIM on Xiaomi