Xiaomi smartphone owners often face the need to use two SIM cards or two accounts in one app. The standard Dual Apps feature allows you to clone messengers, but a full second phone line requires a deeper setup. Modern models of Redmi and POCO support advanced communication technologies that need to be activated correctly.
The second line can be implemented in several ways, from simply adding a physical SIM card to using digital eSIM profiles. The choice of method depends on the specific model of your device and the capabilities of the carrier. In this article, we will analyze all the options available so that you can choose the most suitable one.
Some users confuse app cloning and telephony settings. It is important to understand that calling and SMS through the second line requires either a physical slot or support for Virtual SIM technology at the firmware level. Software bypasses are not always stable, so it is better to use the regular tools of the MIUI or HyperOS system.
Check for Dual SIM and eSIM support
The first step should always be to diagnose the hardware capabilities of your smartphone. Most Xiaomi devices have a hybrid tray, where the second slot can be occupied by a memory card. You need to remove the tray and carefully examine its marking. If it says SIM 2 / microSD, then you can not install the second SIM and flash drive simultaneously.
A more advanced option is eSIM. It's an embedded chip that allows you to record digital operator profiles without a physical card. You can check for this feature in your system settings. → The phone. → General information and search for the section IMEI. If there is. QR-code or item "Add a tariff plan", you are lucky.
- 📱 Physical tray: allows you to install two Nano-SIMs or one SIM + memory-card.
- 💾 Digital Profile: eSIM allows you to store up to 5-8 profiles using one active at the same time (depending on the model).
- 🌐 Regional restrictions: in some firmware versions (e.g, CN eSIM functions can be blocked by software.
⚠️ Note: When buying a smartphone from China (Global) ROM, but CN Hardware: Make sure the communication module supports your carrier’s frequency ranges, otherwise the second line may not work well.
Also, consider that when activating eSIM, one of the physical slots can be temporarily deactivated by the system, which is standard behavior for many modems. Before buying a digital tariff from the operator, check compatibility with your Redmi Note or Xiaomi Mi model.
Setting up the second physical SIM-map
If your device supports two physical cards, the setup process is as simple as possible: insert both SIM cards into the tray, observing the orientation of the slice; once you turn on the smartphone, the system automatically detects new profiles; a special MIUI interface is designed to manage them.
Go to the Settings menu → SIM-You'll see a list of active maps here. Click on the one you want to configure her name, network type (4G/5G) It's important to allocate roles correctly: one card for mobile Internet, another for default voice calls.
☑️ Checking the settings SIM-map
Pay special attention to roaming settings if you plan to use the second line abroad. Each SIM card has a data roaming switch on its menu. Its activation can lead to quick spending if a special tariff is not connected. For the second line, it is often advisable to turn off data transfer, leaving only voice and SMS.
| Parameter | SIM 1 (Main) | SIM 2 (Second Line) |
|---|---|---|
| Mobile Internet | Included (5G/4G) | Switched off (savings) |
| Voice calls | By default. | Always ask |
| SMS default | Yes. | No. |
| VoLTE | Included. | Included. |
Once set up, check both lines. Try making a call and sending a message from each. If the second line doesn't catch the network, try manually selecting the operator from the Network Selection menu by turning off automatic mode.
Use of Dual Apps for messengers
Often, the second line means that users can have two WhatsApp, Telegram, or Viber accounts on the same device, and for this purpose, the MIUI and HyperOS shell have a native Dual Apps feature built in, which creates a completely isolated copy of the application with separate data.
To activate the mode, open Settings → Apps → Dual apps. In the list you will see supported messengers. Switch the switch to the desired application, such as WhatsApp. The system will create a shortcut with an orange icon on the desktop.
What to do if the desired application is not on the list?
Run the copy you've created and register the second number, and you'll need to access or call the SMS to confirm it, and importantly, notifications from the second application may be delayed if the system decides to save battery power.
- 🔔 Notifications: Configure the display of badges for both apps separately.
- 🔒 Privacy: Double applications can be used with a separate password or fingerprint.
- 📉 Resources: two active messengers consume more RAM, which can affect older models.
⚠️ Note: Do not delete the main application if you want to use its clone. Deleting the original will result in the removal of the second copy with all the correspondence data.
Set up eSIM on Xiaomi smartphones
The eSIM technology is becoming the standard for Xiaomi’s flagship 13, 14 and Mix models, allowing you to make a second line without finding a SIM tray. The activation process is completely digital and takes a few minutes. You’ll need a stable Wi-Fi connection.
You'll get it first. QR-code from your carrier. Then go to Settings. → SIM-maps and mobile networks → Add a data plan. The camera automatically reads the code. If the scan fails, you can manually enter the data using the fields. SM-DP+ Address and Activation Code.
Settings → SIM- Maps and Mobile Networks → Add a tariff plan → Scan QRAfter downloading the profile, remember to activate it in the list of SIM cards. The system will suggest assigning use goals: calls, SMS or the Internet. You can flexibly change these settings at any time. eSIM is especially convenient for travelers, allowing you to buy local rates online.
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Save a paper copy or screenshot QR-If you reset your phone to factory settings, re-activation without the code may not be possible or require a visit to the operator’s salon.
It's worth noting that when you activate the eSIM, the phone can reboot, which is a normal behavior required to use the modem configuration. If the process is suspended during the Activation stage, check the Internet connection or try to disable the VPN if it's running.
Solving second line problems
Users often face a situation where the second line does not work correctly: no network, no SMS or Internet access. One common cause is a conflict of network modes. Try to force the network mode to switch for a problematic SIM card in the Preferred network type on LTE or 3G to check the stability of the connection.
Another common problem is resetting access point settings (APN).If the Internet on the second SIM card is not working, although the 4G tick is on, go to the mobile network settings of the second SIM, select Access Points (APN) and press the reset button or create a new point with your operator's parameters.
- 🔄 Reboot: a banal but effective method of restarting a radio module.
- 📡 Resetting network settings: Settings → The phone. → Reset → Reset your Wi-Fi, mobile internet and Bluetooth settings.
- 📞 Checking locks: make sure the number is not blacklisted or blocked by the operator due to debt.
⚠️ Attention: Resetting network settings will delete all stored Wi-Fi passwords and associated Bluetooth devices.
If the problem is software-based and occurs after the MIUI update, you may need to clear the SIM-Toolkit cache or wait for a patch from the manufacturer. In rare cases, flashing the region to Global helps if you use the Chinese version of the device.
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Most second-line problems are solved by the correct choice of network mode (LTE/5G) and the current APN access point settings.
Optimization of two SIM cards
Using two active lines significantly increases battery consumption. The smartphone modem constantly communicates with two cell towers, which leads to increased power consumption. To minimize damage, it is recommended to turn off 5G on the second SIM card if it is used only for calls.
You also have to set up a schedule for switching on and off the SIM cards. SIM-The cards have a schedule-on and off function, so you can set up the automatic shutdown of the second line at night when it's not needed, which will prolong the battery life.
For gamers and users who require maximum performance, there is a Game Mode mode, and make sure that its settings activate blocking incoming calls to the second line, so that the gameplay is not interrupted by a call from the work number.