Two. SIM-Xiaomi maps: full setup from A to Z

Modern Xiaomi smartphones – whether it’s the flagship Mi 14 Ultra or the budget Redmi Note 13 – support the work with two. SIM-This feature allows you to separate personal and work numbers, save on roaming or use tariffs of different operators, but many users face problems: the phone does not see the second one. SIM, Does not distribute mobile internet or reset settings after rebooting.

In this article, we will discuss all the stages of setting up two SIM-cards on Xiaomi, Redmi and POCO — From the physical setup to the finer network settings, you'll learn how to activate maps correctly, set call priorities, distribute. 4G/5G between slots and avoid the typical mistakes (SIM + microSD, we will show you how to avoid losing memory when adding a second one. SIM.

The material is relevant for all models on MIUI 14/15 HyperOS, including devices with Dual support SIM Dual Standby (DSDS) Dual SIM Dual Active (DSDA). We will pay special attention to the nuances for Xiaomi 13T Pro, Redmi Note 12 Pro+ other popular models 2023–2026 year-end.

1. Compatibility Check: Does your Xiaomi support two? SIM-map?

Before you buy a second SIM or try to activate it, make sure that your Xiaomi model supports Dual SIM. Even if the phone has two slots, this does not guarantee full-fledged dual-card operation.

There are three types of configurations:

• 📱 Dual SIM Dual Standby (DSDS) — Both cards are active, but the second card is not available during the call (most Redmi models and the second card is not available). POCO).
• 📞 Dual SIM Dual Active (DSDA) — Both cards work simultaneously, and support calls and 4G/5G parallel (the flagships of Xiaomi) 14, Mix Fold 3).
• 🔄 Hybrid slots - the second slot is combined with microSD (for example, Redmi Note 11). SIM memory-card.

You can check the support for Dual SIM:

1. On the official website of Xiaomi in the characteristics of the model (section "Connection").
2. In the documentation for the phone (look for the inscription Dual Nano-SIM or Hybrid Dual SIM).
3. Through the settings menu: Settings → About the phone → All characteristics → SIM-card status.

⚠️ Note: Some models (e.g. Xiaomi) 12S The second slot can only support Ultra 2G/3G, even if the first SIM work 5G. This is a hardware limitation – it cannot be circumvented by software.

Physical installation SIM-maps: nuances for different models

Installation SIM-Xiaomi seems simple, but there are pitfalls here.For example, improper placement of the card in a hybrid slot can lead to damage to contacts or loss of communication.

Step-by-step:

1. Turn off the phone (required!) Removing the SIM on the device on can damage the slot.
2. Find a tray for SIM-maps -- usually on the top or side of the map. Use a clip from the kit to open it.
3. Place the cards according to the scheme on the tray: 📇 Nano-SIM (Transformed) – for the main slot. 📇 Nano-SIM or microSD – for hybrid slots (if available).

Carefully insert the tray before the click. Don't make any effort -- if it doesn't come in, check if the cards are installed correctly.

Features for popular models:

⚠️ Note: If after installation of the second SIM The first one stopped seeing the phone, check: Correct placement of cards (sometimes they stick in the tray). SIM (Scratching or contaminated contacts can cause a failure. MIUI/HyperOS — Some of the software has recognition bugs. SIM.

Turn off the phone.

Check the SIM type (Nano-SIM)

Clean the contacts of cards with dry cloth

Use the original paper clip from the set-->

Activation second SIM-card in phone settings

Once the cards are physically installed, they need to be activated in the system, and in Xiaomi, this process may vary depending on the shell version (MIUI or HyperOS).

Instructions for MIUI 14/HyperOS:

1. Go to Settings. → SIM-maps and mobile networks.
2. Press inactive. SIM-Card (it will be marked as "Disabled»).
3. Turn on the switch Use the switch SIM-map.
4. Select a name for the card (for example, “Worker” or “Personal”) – this will help not to confuse them in the interface.
5. Choose the type of network for each SIM: 🌐 4G/5G — Internet and Calling (Priority Slot). 📞 3G/2G — If you only need calls (saves charge).

On HyperOS (new Xiaomi 14, Mix Fold 3 models), the path is a little different:

Settings → Connections and Sharing → SIM- Maps

If the second SIM is not activated:

• 🔄 Restart your phone – sometimes the system doesn’t recognize a new card right away.
• 📶 Check the coverage of the operator’s network (possibly the problem is on the provider’s side).
• 🔧 Reset network settings: Settings → SIM-map → Resetting mobile network settings.

💡

If the phone asks PUK-code SIM, it can be found on a plastic carrier to which the card was attached, or request from the operator through a personal account.

4. Call Priority and SMS: Where will the calls come from?

When both SIM-The cards are active, the question arises, to what number will receive incoming calls and SMS? In Xiaomi, it is flexible – you can choose the main card or distribute the types of calls.

How to set priority:

1. Open the Settings. → SIM-maps and mobile networks → A challenge → Call settings.
2. Select the Priority option SIM-call-card:

Settings → SIM-map → Communications → SIM-default-card

Important nuances:

• 🔄 If you select the “Ask Always” option when you call a non-priority phone SIM Your phone may not vibrate (check notification settings).
• 📱 In some models (for example, POCO F5) priority SMS and calls are set up separately.
• 🌍 If one of them SIM used for roaming, set it as a secondary to avoid random outgoing calls at high rates.

5. Mobile Internet Distribution: How to Make 4G/5G Work on Both SIMs

One of the most common problems with using two SIMs is that mobile internet only works on one card, which is due to the limitations of the communication module: most Xiaomi phones (except flagships) do not support Dual 4G/5G at the same time.

How to set up the Internet on two SIMs:

1. Go to Settings → SIM-cards and mobile networks → Mobile Internet.
2. Choose. SIM-Data card – you can only specify one card for the Internet.
3. For the second SIM, activate the option to Allow data transfer during roaming (if necessary).

The following are the ways to use the Internet on both SIMs:

• 🔄 Manual switching: in the notification panel tap on the mobile data icon and select the desired one SIM.
• 📶 The “Only” regime 3G/2G» second SIM: If the main card is used 4G, The second one can work on the network. 3G call-in + slow-web.
• 🌐 Wi-Fi Calling: if the operator supports this function (for example, MTS or Beeline), calls and calls SMS will be via Wi-Fi, freeing up a slot for the Internet.

HyperOS models (Xiaomi 14, Mix Fold 3) have an experimental Dual VoLTE feature that allows both SIMs to use 4G for calls and the Internet simultaneously. Activated via an engineering menu (#4636##), but can run unstablely.

6. Solving typical problems with two SIM-map

Even after you set up correctly, Xiaomi users are plagued by bugs: the network goes missing, the phone doesn't see the second SIM after the update, or the operator is not identified.

Problem 1: Second SIM is not defined or No Service

• 🔧 Check if the card is included in the settings: Settings → SIM-map → [Name. SIM] → Turn on.
• 📶 Make sure the carrier supports your phone model (some virtual carriers, such as Yota or the likes of the phone). Tele2, It may not work in hybrid slots).
• 🔄 Reset the settings. APN: Settings → SIM-map → [Name. SIM] → Access points (APN) → Reset to factory.

Problem 2: One of the SIMs has stopped working after the MIUI/HyperOS update

• 📱 It's a famous firmware bug. MIUI 14.0.1–14.0.4 Solution: Reverse to the previous version via Settings → The phone. → Updating the system → Three points. → Select the service pack. or wait for the patch (usually released within 1-2 weeks after the release of the new version).

Problem 3: The phone does not save SIM settings after restarting

• 🔧 This is due to a telephony cache error.Solution: Settings → Annexes → Application management → Three points. → Show system-based → Telephony → Warehouse → Clear the cache