How to make a second line on a Xiaomi phone

The modern rhythm of life dictates its conditions, and having two SIM cards in a smartphone has become more a necessity than a luxury. Owners of Xiaomi, Redmi and Poco devices often wonder how to correctly organize the work of several numbers, it can be separation of personal and work calls or finding a better tariff plan from another operator, while keeping the main number active.

Fortunately, the MIUI ecosystem and the new HyperOS provide flexible communication management tools, so you don't have to carry two phones or constantly rearrange plastic SIMs, and software and hardware solutions allow you to create a full-fledged "second line," whether it's a physical card, a virtual number, or even eSIM technology.

In this guide, we will take a look at all the options available to activate an extra number, the technical details of map installation, setting call priorities and the Internet, and the topic of virtual numbers that are becoming more popular among Android users.

Hardware installation second SIM-map

The most common and reliable way to get a second line is to install a physical SIM card.Most modern Xiaomi models are equipped with a hybrid tray or a full-fledged slot for two Nano-SIM cards. Before starting the procedure, make sure that the device is turned off to avoid damage to contacts or software failures in the hardware identification system.

Use a special paper clip that comes with the kit, or a thin needle to remove the tray. Pay attention to the circuit that is struck on the tray itself or the case of the smartphone, as the orientation of the chip may vary depending on the model. In some older models, the second slot can be combined with a microSD card connector, which requires a choice between the memory expansion and the second number.

⚠️ Attention: Do not put too much effort into installing the tray. If it does not enter smoothly, check that the SIM card is correctly orientation. Forced indentation can damage the motherboard's internal contacts.

Once the phone is turned on, the system automatically recognizes the new SIM card, a notification will appear on the screen asking you to adjust the usage parameters, and you will be asked to assign roles for each card: which one will be used for the new card. GSM-This is the basic setting that you can change at any time, and this is the default setting, and which is for mobile data.

Dual SIM setup in the MIUI and HyperOS menu

After physical installation of cards it is necessary to configure their software part competently. MIUI It offers detailed control over each number. Go to the Settings menu. → SIM-Maps and mobile networks. This is where your communications are basically controlled.

In this section, you will see a list of installed cards. By clicking on a particular SIM card, you can change its displayed name (for example, "Work" or "Home"), which makes navigation easier. It also configures the type of preferred network: 4G/LTE, 3G or 2G. For the second line, it often makes sense to limit communication to voice and SMS only, leaving the Internet for the main card to save battery power.

Special attention should be paid to the function "View" SIM-It allows you to quickly switch cards right from the notification curtain or the widget on your desktop, which is especially convenient if you don't want to make calls from the main number, but you have to stay in touch. SIM instantaneously.

Don't forget about roaming settings. If you're traveling, the second line can be a local SIM card, and the main line can be roaming only for incoming ones. In the Additional settings menu, you can prevent the second card from accessing the Internet in roaming to avoid unforeseen costs.

Using eSIM technology on Xiaomi

Xiaomi’s flagship models are increasingly supporting eSIM (embedded SIM) technology, a built-in chip that allows you to activate a virtual SIM card without having to use a physical slot, ideal if your tray is already occupied with two cards or you want to add a temporary number for a trip abroad.

You will need to activate eSIM. QR-It's a completely digital process, where you scan the code with your smartphone camera in the Settings menu. → SIM-maps and mobile networks → Add the eSIM tariff. The system will download the operator profile and automatically configure the necessary network parameters.

The main advantage of eSIM is the ability to store multiple profiles at once and switch between them as needed, for example, you may have a profile for work, a profile for travel and a profile for personal use, but only two of them will be activated at a particular time.

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When activating eSIM, make sure that the smartphone is connected to stable Wi-Fi. Downloading the operator profile requires a constant connection to the Internet, and a communication interruption can lead to an activation error.

Virtual numbers and clone applications

If you don't need a physical second line, but you just need an extra number for check-in or temporary calls, you can use virtual telephony services, and applications like Skype, Google Voice, or specialized VoIP services allow you to get a number that will work over the Internet.

Another popular method is to use App Cloning (or Second Space) feature, with the built-in MIUI feature allowing you to create a full copy of the messenger (WhatsApp, Telegram, Viber), so you have two independent apps on one device, each of which can be linked to its own phone number.

• 📱 Second Space: Creates an isolated environment in the phone with its apps and contacts where you can install a SIM card or link a virtual number.
• 📞 VoIP applications: Allows you to make calls to regular numbers over the Internet using a dedicated virtual number.
• 🔒 Privacy: Virtual numbers are ideal for registrations on dubious sites so as not to shine a primary personal number.

It is worth noting that some banks and services may not accept virtual numbers for authorization for security reasons, in which case the only way out is to issue a full SIM card from a mobile operator.

Call and Internet management for two lines

When both lines are active, it's critical to properly distribute tasks between them. SIM-The maps are called Calls and Mobile Internet, and you can choose which card you're going to use by default, but the system allows you to change that behavior flexibly.

For example, you can set the "Always Ask" mode for outgoing calls, so that each time you dial a number, the phone will ask you to choose which SIM card to call from, which is convenient if you often call different contacts from different numbers (for example, couriers from one and colleagues from another).

The situation is different for mobile Internet: at one point in time, the Internet can only work through one SIM card, switch between them automatically when changing settings or manually through the notification curtain, it is important to monitor traffic limits if the rates on the cards are different.

⚠️ Attention: In active mode 4G on one SIM card, the second card can switch to mode 2G/3G to anticipate incoming challenges (technology) DSDS). If the second card has a weak signal 2G, Incoming calls may not be available. Check your carrier's network coverage.

Smart Calls is also available, and the smartphone can remember which number you last called a particular contact from and suggest that you use it next time, eliminating the need to constantly monitor your settings.

Solving the Dual SIM Problem

Despite the system's fine-tuning, users can face difficulties, and a common problem is when the phone sees only one SIM card, in which case the first step is to check if the card is sitting tight in the tray, sometimes it helps to wipe the SIM contacts with a soft eraser.

If the cards are determined but do not catch the network, check the settings of the network modes. Make sure that both cards are selected Preferably. 4G/LTE (or 5G, It's also worth checking if the SIM card is blocked. PIN-a request for which the notification may have been lost.

• 🔄 Network reset: If the connection is unstable, try resetting the mobile network to factory settings. This won't delete your data, but will return the configuration. APN and net to baseline.
• 🔍 Software Update: Modem issues are often fixed in system updates. Check for new versions MIUI/HyperOS.
• 📶 Manual network selection: In some cases, automatic operator selection fails. Try to select your operator's network manually in mobile network settings.

If nothing helps, it may be hardware frequency incompatibility. Make sure your version of the smartphone (Global, China, EEA) supports the local carrier’s frequencies, especially for the 4G Band 3, 7, 20 bands.

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The correct setting of APNs is critical to the mobile internet on the second SIM card. If the internet is not working, check the settings of the access points in the mobile network menu.