The modern rhythm of life dictates its rules, and often one phone number becomes not enough for a comfortable communication. Users of Xiaomi, Redmi and Poco smartphones often wonder how to effectively separate personal and work contacts or simply use the advantageous tariffs of different operators. Fortunately, the MIUI shell and the new HyperOS provide powerful tools to accomplish this task without having to carry two devices with you.
In this article, we will discuss in detail all the ways to activate the second line. SIM-You'll learn how to set up SIM card switching, how to split notifications, and even how to create a completely isolated space for a second account.
It's important to understand that the term "second line" can be interpreted differently depending on your needs. For some, it's a trivial setup of a second SIM, and for others, it's the need to have two different WhatsApp or Telegram accounts on the same device. We'll cover all of these scenarios so you can choose the best option for your smartphone use scenario.
Physical installation second SIM-map
The most obvious and reliable way to get a second line is to install a second physical line. SIM-Most modern Xiaomi models are equipped with a hybrid tray that allows you to use two nano-sims at the same time or one SIM and a MicroSD memory card. Before starting the procedure, make sure that the phone is turned off to avoid damage to contacts or the card itself.
Remove the tray with a special clip that comes with a kit, or a thin needle. Pay attention to the shape of the cutouts: usually one side of the tray is for the first SIM, and the other is for the second or memory card. Carefully insert the cards, observing the orientation (gold contacts should look down), and insert the tray back into the case until the characteristic click.
After switching on the device, the system will automatically detect new SIM-If this does not happen, check the integrity of the contacts and the correct installation. In some regions, operators require manual adjustment of network settings, but in the case of Xiaomi, most often all settings are automatically tightened over the Internet.
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Use the original paperclip from the kit or a very thin needle. Do not use large-diameter stationery scrapers - this can damage the tray mechanism.
It’s important to keep in mind that range compatibility is important. If you’re using an old phone and a new 4G/5G SIM, speeds may be limited. It’s also worth checking if your particular model range supports two 4G cards simultaneously, as some budget models switch the second card to 2G/3G mode when the first one is active.
Setting up two numbers in the Android system
After the physical installation, you need to configure the software part correctly. Go to the Settings menu and find the section. SIM-And this is a map and a mobile network, and it shows both of the maps that we've discovered, which the system usually denotes as SIM 1 and SIM 2.You can rename them for convenience, such as "Work" and "Personal" to avoid confusion when making calls.
The same menu also configures the default settings, and you have to choose which card will be used for mobile Internet and which for voice calls and which for mobile Internet. SMS-System flexibility MIUI It allows you to ask a question every time you call, unless you want to fix one card as your primary voice.
☑️ Setting priorities SIM-map
Pay special attention to roaming and network type settings. For each SIM card, you can individually choose your preferred network type: Preferably 5G, Preferably 4G or Only 2G. This is useful if in your region one operator is better at catching the old standards, and another provides fast Internet.
⚠️ Note: When activating the second SIM-Some models may turn off the microSD card slot. Check the specification of your model so as not to be surprised by the disappearance of the flash drive from the file manager.
Be sure to check balance and plan. Using two active lines can consume battery power faster, as the modem is constantly in touch with two towers at once.If you rarely use the second line, consider temporarily shutting it down via a software switch in the notification curtain.
Function "Cloning applications" for messengers
Often, the second line is not a second SIM card, but the ability to have two accounts in the same messenger. MIUI has a built-in App Cloning feature that creates a full copy of the installed social network or messenger, which allows you to log into a second account associated with another phone number.
To activate, go to Settings → Applications → App Cloning. In the list of supported programs, find the desired messenger, such as WhatsApp, Viber or Telegram, and activate the switch next to it. The system will create a shortcut with an orange icon that will lead to a second, isolated application.
The second account works independently of the first one: it has its own notifications, its own audio settings and its own correspondence history. It is the ideal solution for those who want to share work chats and personal correspondence without installing third-party software. Notification support works normally, so you do not miss an important message on any of the numbers.
It’s worth noting that cloning consumes additional RAM resources, so if you have a budget model of a smartphone with 3 or 4 GB of RAM, activating multiple clones can slow down the system, in which case leave the clone on only for the most important second account.
Use of the “Second Space” mode
For those who want maximum isolation, Xiaomi has a Second Space feature, which is not just a clone of an app, but a full-fledged second virtual environment inside your phone, and in fact, you have two smartphones in one: each space has its own desktop, its own apps, its own galleries and its own accounts.
You can activate this function through the Settings menu → About Phone (or in advanced settings) → Second space. When you first start, the system will prompt you to create a separate password or fingerprint to enter the second space. This provides a high level of privacy: being in the main profile, no one will know about the existence of the second.
| Parameter | Cloning of applications | Second space | Guest mode |
|---|---|---|---|
| Data isolation | Only inside the app. | Full (whole phone) | Temporary. |
| Separate Google Account | No. | Yes. | No. |
| Memory consumption | Low. | High. | Low. |
| Difficulty setting up | Minimum | Medium | Minimum |
Switching between spaces is instantaneous, through a label on your desktop or a given fingerprint, which is very convenient: you put one finger on your personal profile, the other on your work profile, and all the applications in the second space are re-installed, allowing you to have different versions of programs, for example, or different privacy settings.
Impact on the battery
Virtual numbers and Internet telephony
If a physical SIM card is not possible or feasible, virtual telephony services are available. SMS And you can connect these numbers to applications like Skype, Zoom, or specialized ones. SIP-Customers installed on your Xiaomi.
To implement this method, you will need a stable Wi-Fi or mobile Internet connection. Once you sign up for a virtual telephony service, you get a number that you can use to sign up for services or for incoming calls, which is often cheaper than buying and maintaining a second physical SIM card, especially for temporary needs.
But there are limitations to this method: Many banks and government agencies do not accept virtual numbers to register or confirm transactions, and voice quality is directly affected by Internet speed, which can be critical in places with poor network coverage.
⚠️ Note: When using virtual numbers to register for important services (banks, government services), make sure you keep access to the number indefinitely.
Solutions and optimization of work
When using two lines, users may encounter a number of typical problems, most often due to the fact that the phone “loses” the network on one of the SIM cards or incorrectly determines the priority of the Internet. If the network icon is missing, try switching the network mode in the settings from 5G/4G/3G/2G to Only 4G and back to restart the communication module.
Another common problem is notification confusion. To avoid this, cloned apps are advised to change the theme or color of the icon if the shell allows, or simply watch the orange clone marker closely. It is also worth checking the energy saving settings: the system can "kill" the background process of the second messenger, and messages will arrive with a delay.
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For stable operation of two lines and cloned applications, be sure to add important messengers to the battery exception list (No restrictions), otherwise the system will aggressively close the background processes.
If you notice a high heat or a quick discharge, analyze which apps are active in the second line. Often, the "heavy" social networks in the second space continue to load content in the background. Regular cleaning of the cache and closing unused background applications will help keep the performance of the smartphone at a high level.