How to Set Up Second Line on Xiaomi: eSIM and Dual SIM

The modern smartphone has long ceased to be just a means of communication, becoming a central hub for solving work and personal tasks. Owners of Xiaomi, Redmi and Poco devices often face the need to separate the flow of information, but not everyone knows about the hidden capabilities of the operating system MIUI or HyperOS. Organization of space on the screen and in communications requires a competent approach, especially when it comes to adding a second number.

There are several scenarios for using the second line, from the banal connection of a physical Dual SIM card to more advanced solutions with virtual numbers. Each method has its own technical features and requires a certain sequence of actions for the correct operation of all services. In this article, we will discuss in detail all available ways to activate an additional number.

Whether you want to separate work calls and private messages, or just looking for profitable rates from different carriers, the right setup of the device will be a key factor in success.We will look at the nuances of working with eSIM, setting call priorities, and even using virtual applications to create a second line without a physical SIM card, which will allow you to maximize the potential of your gadget.

Using two physical SIM-slot-card

The most common and classic option for Xiaomi smartphones is to use two physical nano-SIM cards. Most modern models, including the Xiaomi 13/14 series and the Redmi Note, are equipped with a hybrid tray that allows you to use two communication modules simultaneously.

It is important to correctly position the cards according to the circuits on the tray, as improper installation can lead to a lack of signal. Once the device is turned on, the system automatically recognizes both operators, but for full operation you will need to manually adjust the Settings menu. → SIM-And you can assign which card will be responsible for mobile Internet and which will be responsible for voice by default.

One of the key features of MIUI is the flexibility to manage costs and contacts for each line, you can set traffic limits separately for each SIM, which is especially true when using package rates with different volumes of gigabytes. In addition, the system allows you to assign each card a unique name and color indicator to visually distinguish incoming calls on the lock screen.

• 📶 Ability to receive calls to both numbers simultaneously without missing important contacts.
• 💰 Flexible cost management: setting different call and internet plans.
• 🎨 Visual Differentiation: Color Marking SIM 1 and SIM 2 in the dialer interface.
• 🔄 Quick switching: the function "Smart" SIM-The card automatically selects the network with the best signal.

It is worth noting that when using two active SIM cards in 4G/5G mode, the second card often goes into 2G/3G mode during a conversation on the first one, unless VoLTE technology is supported.

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Enable the VoLTE function in the settings SIM-cards to be able to simultaneously talk and use mobile Internet at high speed, without switching to the Internet 2G/3G.

Connecting a virtual eSIM to Xiaomi

ESIM (embedded SIM) technology is becoming increasingly popular among Xiaomi’s flagship models, allowing the switch from physical plastic media to a digital profile.This solution is ideal for those who travel frequently or want to use a second number without taking up a physical slot for a second SIM. eSIM support is available in series such as the Xiaomi 12/13/14 Pro and some Mi 11 models.

The process of activating eSIM is radically different from installing conventional plastic. You do not need to go to the communication salon for a new "bar"; just get the right one. QR-Scanning the code through the settings menu allows you to upload the operator profile directly to the device's memory, after which the second line becomes active.

However, there are important regional limitations. For example, in the MIUI China (CN ROM) version, eSIM support may be software-limited or non-existent even if the phone's hardware allows it. Global ROMs typically unlock functionality, but make sure to check with the carrier for compatibility with your particular smartphone model before buying a tariff.

Set up profiles and call priorities

After successful activation of the second line, it is critically important to correctly configure the logic of the phone so as not to miss an important call or spend extra money on the Internet. → SIM-And maps and mobile networks hide powerful tools to control device behavior, and it sets the default map for voice calls and data.

Function “Smart” SIM-The map deserves special attention, as it automates routine processes. If you configure this option, the phone will automatically switch the mobile internet to the SIM card that has the best coverage in the area, or use a second line to call if the first one is busy or unavailable.

For each contact, you can give your preferred SIM card in the phone book, which means that when dialing your mom's number, the phone will always use a personal SIM, and when calling the courier, it will always use a work card, and this detail avoids confusion and random costs, providing complete control over communication.

Applications for the second line without a SIM card

If your smartphone doesn’t support eSIM and the physical card slot is busy, software solutions come to the rescue. There are specialized applications that provide virtual numbers for calls and SMS over the Internet. Services such as Google Voice, Skype or specialized Russian and foreign analogues allow you to get a second number without interference with hardware.

The way these applications work is based on VoIP (Voice over IP), which is done via Wi-Fi or mobile Internet, which allows you to keep the main SIM card free, but it is worth considering that the quality of communication depends on the speed of the Internet connection, not on the signal level of the cell tower.

Many users use this method to sign up for instant messengers or services that require SMS confirmation to avoid “shine” the main number. Virtual numbers are often short-term rentals, making them ideal for one-time registrations or temporary projects.

Solving problems with the definition of the second SIM

It's not uncommon for users to see the second card when they're installed, or if they lose their network all the time. The first step in diagnosis is always to check the physical contact: wipe the SIM chip with a soft, dry cloth and make sure it sits tightly in the tray. Sometimes, the oxidation of the contacts leads to unstable operation.

If the physical contact is fine, the problem may be software network failures. Try resetting the network settings to factory values through the Settings menu → Connection and Sharing → Reset Wi-Fi, mobile network and Bluetooth. This action will not delete your personal data, but will return network settings to the original state, which often resolves priority conflicts.

⚠️ Note: Before resetting your network settings, be sure to save passwords from Wi-Fi networks, as they will be deleted during the recovery process.

It’s also worth checking if the SIM card is blocked by the operator due to suspicious activity or lack of payments. In rare cases, the problem may be the firmware: if you use custom ROM or early beta MIUI, there may be bugs in the modem, in which case waiting for an official update or rolling back to a stable version may be the only solution.

Optimizing battery consumption for two lines

Using two active SIM cards inevitably leads to increased power consumption, and a smartphone modem has to constantly communicate with two different cell towers, which puts additional strain on the processor and radio module. Owners of devices with a smaller battery should be aware of ways to minimize this impact.

In MIUI settings, there is a mode "Flight mode" for individual SIM cards. If you are in an area where one of the SIM cards catches the network extremely poorly, the phone will constantly try to find the signal, wasting the charge. Temporary disabling the second line in the SIM control menu will help save energy before leaving the area of poor coverage.

In addition, disabling 5G search on one of the cards, unless urgently needed, will also have a positive impact on autonomy, switching the second SIM to 2G/3G Only mode (if the developer menu or operator settings allow it) will reduce background activity of searching for high-speed networks.

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Two active SIM cards can increase battery consumption by up to 15-20% per day, so in power saving mode it is recommended to turn off an unused line.