How to turn on and configure the two SIM-Maps on the Xiaomi smartphone: full instructions

Two. SIM-A card in a smartphone is not a luxury, but a necessity for many users: Businessmen share work and personal numbers, travelers save on roaming using local sims, and someone just wants to stay connected in areas with unstable coverage of different operators. Xiaomi smartphones have long supported this feature, but not all users know how to activate and configure it correctly.

In this article, we will learn how to include two SIM-Maps on Xiaomi devices (including Redmi models, POCO Black Shark, which nuances are important to consider when choosing slots, how to allocate priorities between cards and what to do if the second one is not the best. SIM Particular attention will be paid to the differences between hybrid slots (where one of the two is not defined). SIM Shares space with memory card) and full Dual SIM-decision-making.

Checking the compatibility of your Xiaomi with two SIM-map

Before you try to activate the second SIM, Make sure your smartphone physically supports this feature.Most current Xiaomi models (starting with the 2019 Redmi Note 7 and Mi 9) are equipped with Dual. SIM, But there are some important exceptions:

• 📱 Hybrid Slots: In some models (e.g, POCO X3 The Pro or Redmi Note 10, the second slot is combined with a microSD connector, which means you can use either one at a time. SIM1 + SIM2, either SIM1 + microSD.
• 🌍 Regional restrictions: Some smartphone versions for the Chinese market (noted) CN In the model, you may not support Dual SIM global-firm.
• ⚡ 5G dual SIM: In devices with 5G (for example, Xiaomi 12T or Redmi K50) second-second SIM It can only work in the mode 4G, if the first use is 5G.

To know the configuration of your device:

1. Look at the tray for SIM-If there are two separate slots under nano-SIM, it is a full-fledged dual. SIM. If one nest is signed SIM/microSD — It's a hybrid slot.
2. Check the specifications on the official Xiaomi website for your phone model (enter it in the catalog search).

⚠️ Note: If you use a hybrid slot and insert a microSD instead of a second one SIM, The system can automatically disable the Dual function. SIM In order to get it back, you'll have to physically remove the memory card.

Preparation SIM-pre-installed

Even if your Xiaomi supports two of your SIM-If you have a card, if you have a card that's not prepared correctly, you can have a problem activating it:

• ✂️ Nano-SIM format: All modern Xiaomi smartphones (except for very old models before 2017) require nano-SIM format. If you have a different size card, cut it or request a replacement from the operator.
• 📶 Activation with the operator: Make sure that both SIM-The card is activated on the operator's network, and the inactive card will not be detected by the phone, even if it is physically inserted.
• 🔄 Reboot after installation: After inserting new ones SIM-cards be sure to restart the device - this will reset the modem cache and speed up recognition.

If you're rescheduling SIM-card from another phone, check it out:

• Is it on her? PIN-code (if yes, remember it – it will be required at the first inclusion).
• Is the card blocked due to debts or expired expiration date (relevant for corporate tariffs).

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If you are using eSIM (virtual) SIM-Map), it can be added to the settings → SIM-maps and mobile networks → Add a mobile fare. However, not all Xiaomi models support eSIM – check your device specifications.

Step-by-step: how to activate the second SIM-map

Once the cards are prepared and inserted into the tray, we start setting up. The process may vary slightly depending on the version. MIUI (12, 13 or 14), but the general logic holds.

Step 1: Physical installation

1. Turn off your phone (required!).
2. Remove the tray for SIM-cards with a paper clip (the hole is usually on the right side of the face).
3. Place it. SIM-schemas in the schema (usually SIM1 top-up, SIM2 For hybrid slots, select priority: either the second SIM, microSD.
4. Insert the tray back before the click and turn on the phone.

Step 2: Program activation

1. Go to Settings. → SIM-maps and mobile networks.
2. Tap the second name. SIM-maps (it can be displayed as SIM2 or Unknown SIM).
3. Activate the switch Turn on SIM-map.
4. If required, enter PIN-code (if it is installed on the map).

Step 3: Set priorities

After activation, the system will prompt you to select:

• 📞 SIM for default calls: Select which card will be coming from outbound calls unless specified SIM.
• 🌐 SIM Mobile Internet: You can assign a master card to the data or allow both (but only one card will work at the same time).
• 📩 SIM for SMS: Specify which number will send messages by default.

Set up networks and priorities for two SIM-map

One of the key features of Dual SIM — The ability to manage networks flexibly, for example, you can use a single card to 4G/5G-The second one is for internet calls only. 2G (It saves battery life. Here's how to set it up:

1. The choice of networks for each SIM

• Go to Settings. → SIM-maps and mobile networks → [Name of name SIM] → Type of network.
• For the main card (with the Internet) select 4G (preferably 5G (if maintained).
• For the second card, you can limit yourself. 3G or 2G, If you only need it for calls.

2. Mobile Internet Management

Mobile data only works through one SIM-To switch between them:

1. Open the notification bar and hold your finger on the Mobile Data icon.
2. In the menu that opens, select the desired SIM-drop-down.
3. To automatically switch, use apps like Dual Apps (available in the app). MIUI default).

3. Configure call forwarding

If one of them SIM-cards are often unavailable (e.g., corporate with limited coverage), you can configure forwarding:

1. Go to Phone → Settings → Call forwarding.
2. Choose. SIM-map for which you want to set up a redirection.
3. Specify the terms (for example, if unavailable) and the number for forwarding (you can specify the number of the second). SIM).

⚠️ Note: If you use VoLTE (calls through the phone) 4G) one-on-one SIM-map, second SIM This is a limitation of the hardware of most Xiaomi smartphones (except flagships like Xiaomi 13 Ultra).

Common Problems and Their Solutions

Even after setting it up properly, users face typical problems, and here are the most common ones and how to fix them:

1.Second. SIM netless

• 🔄 Reboot: Sometimes, a normal phone reboot helps.
• 📡 Manual Network Search: Go to Settings → SIM-map → [SIM2] → Search for networks and select operator manually.
• 🔧 Resetting network settings: In Settings → System system → Resetting settings → Resetting mobile network settings.

2.You cannot use mobile internet and phone calls at the same time.

This is the hardware limitation of most Xiaomi smartphones (except for the flagship models with Dual). 4G VoLTE) Solutions:

• Turn off your mobile phone while you call (or vice versa).
• Use Wi-Fi Calling (if supported by the operator).
• Set up call forwarding to the second SIM, if the first one is busy with the Internet.

3. Battery discharges quickly

Two active SIM-The cards increase energy consumption, especially if both are in the 4G/5G. Optimize settings:

• For the second. SIM select mode 2G (If you only need it for calls).
• Turn off background data transfer for unnecessary applications in Settings → Annexes → Permits → Auto-start.
• Turn on the Battery Savings mode in the power settings.

4. Contacts are kept on the wrong person SIM-map

By default. MIUI Can keep contact with the last used SIM. To change that:

1. Open the Contacts app.
2. Go to Settings. → Contact management → Retention by default.
3. Choose the right one. SIM-Card or Device (to keep contacts in the memory of the phone).

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If the problem is SIM-The map appeared after the update MIUI, Try to roll back on the previous firmware version or wait for a patch. SIM correct in the following updates.

Features of Dual SIM different models of Xiaomi

Not all Xiaomi smartphones work equally well with two. SIM-Here are the key differences between popular series:

1. Flagship models (Xiaomi) 12/13, Mix 4, Black Shark 5)

• 🔝 Full support for Dual 4G VoLTE – You can call one at a time SIM and use the internet for another.
• 🌐 Support 5G + 4G (second SIM It will only work in 4G, if the first use is 5G).
• 📡 Improved antennas for stable reception on both SIM.

2. Mid-segment (Redmi Note) 11/12, POCO X4/X5)

• 📶 Support 4G + 4G, But without VoLTE on both sides. SIM simultaneously.
• 🔋 Higher power consumption with active use of two cards.
• ⚠️ Possible problems with switching between networks (for example, when a signal is lost on one of them). SIM).

Budgetary models (Redmi) 10A, POCO C40)

• 📞 Often, only one. SIM supportive 4G, second-bound 3G/2G.
• 🔌 Hybrid Slots (you have to choose between the second one) SIM memory-card).
• 🛠️ Additional adjustments may be required APN for the correct operation of the mobile Internet.

4. Models for the Chinese market (Xiaomi) CN)

• 🌏 Some global frequencies may not be supported (for example, B20 Europe).
• 🔄 Requires unlocking the bootloader to install global firmware (otherwise Dual) SIM may work unstablely).
• 📵 Possible problems with the definition of operators outside China.

Find out the exact characteristics of Dual SIM For your model, check the specifications on the Xiaomi website or use the app CPU-Z (section → SIM Info).

How to optimize the use of two SIM-map

Two. SIM-Cards are not only convenient, but also additional settings that will help save time and battery:

1. Division of contacts by SIM-map

If you are personal and working SIM, You can link contacts to specific maps:

1. Open the contact in the Contacts app.
2. Click Edit and select SIM-map.
3. Now, when you call this contact, the phone will automatically use the tethered phone. SIM.

2. Quick switching between SIM

Not to be in the settings every time:

• Add the widget. SIM-Main screen cards (hold your finger on the screen) → Widgets → SIM-map).
• Use voice commands via Google Assistant: “Call your mom with your mom.” SIM2».
• Set up gestures in Settings → Additionally. → Gestures (for example, swipe down with two fingers to switch) SIM).

3. Traffic savings

If you have a limited rate on one of the SIM:

• B Settings → SIM-map → [Name of name SIM] → Access point (APN) Set limits on background traffic.
• Use the Dual Apps app (built into the app) MIUI), to duplicate instant messengers (such as WhatsApp or Telegram) for each SIM.
• Enable Background Limitation for Apps That Should Not Use Mobile Internet on the Second SIM.

4. Backup of settings SIM

If you change often SIM-maps (for example, on trips), save their settings:

1. Take screenshots of screens with settings APN each SIM.
2. Export contacts tied to SIM, to.vcf file (via Contacts) → Settings → Exports).
3. Write it down. PIN-codes PUK-codes for both cards (store them in a secure place, such as Google Keep with encryption).

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If you travel frequently, consider using eSIM (virtual). SIM-This will eliminate the need to physically change the cards. Check the eSIM support in your Xiaomi model on the manufacturer's website.

FAQ: Frequent questions about Dual SIM on Xiaomi