Modern Xiaomi smartphones have long ceased to be just devices for calls, becoming powerful multimedia centers, but the basic communication function remains a priority for most users. The question of how to insert a second SIM in Xiaomi often arises for those who move from one-way models or first pick up a device with a hybrid slot. Dual-simacy today is not a luxury, but a necessity for separating work and personal contacts or using different tariff plans to save on traffic and minutes.
The procedure for installing a memory card or a second communication module can vary dramatically depending on the specific series of devices and the year of its release. While the flagship Xiaomi Mi and Redmi Note models of recent years are often equipped with full-fledged slots, budget options may have design limitations. In devices with a hybrid slot, installing a microSD memory card physically blocks the ability to use the second one. SIM-card, requiring the selection of one of two options.
Before you start disassembling the tray, you need to clearly understand the type of design of your device, so as not to damage the delicate mechanisms of extraction. Mishandling the tray or using incompatible nano-SIM cards can lead to a stuck mechanism inside the case. In this article, we will discuss in detail all the nuances of installation, from finding a paper clip to software setting communication priorities in the shell of MIUI or HyperOS.
Definition of tray type and preparation of tools
The first step before any physical manipulation of a gadget is to identify the type of tray for the device. SIM-In the arsenal of Xiaomi there are three main design options: a classic split slot, combined (hybrid) and a modern tray without mechanical extraction (eSIM, although in the mass segment of the Russian Federation this is still rare). Most often, users are faced with the need to understand whether they are supported by Redmi or not. POCO simultaneous operation of two "simok" and memory card.
To extract the tray, you will need a special key that comes with the box. If the original paper clip is lost, you can use a thin needle or straightened stationery clip, but be careful: too thick an object can damage the latch mechanism inside the case. Do not try to pick the hole with a knife or toothpick, as wood or plastic can crumble and get stuck deeper than metal.
⚠️ Warning: Make sure the phone is turned off before removing the tray. Although current devices support hot replacement, there is still a risk of short-circuiting contacts if sloppy extraction is done, especially if there is moisture in the tray.
Examine the end of the device in good lighting. The tray is usually located on the bottom or top edge, less often on the side. On some moisture-proof models, such as the Xiaomi 13 Pro, the tray can be sunk deeper and require a stronger but more accurate press. If the tray does not extend after pressing the key, do not use excessive force - you may not have hit the opening of the mechanism.
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If the paperclip is lost and there is no needle at hand, use a thin metal earring or pin, but avoid using plastic items, they can break inside the hole.
Instructions: Install SIM in Classic and Hybrid Slot
After successfully extracting the tray, carefully examine its shape. In the classic version, you will see two separate recesses of the same size, designed exclusively for nano-SIM cards. In this case, it is simple: the first card is placed in slot 1, the second one is in slot 2, and the microSD card takes its own separate place without interfering with any of the sims.
It gets complicated if you have a hybrid slot. Visually, it looks like a single metal frame, where one seat is reserved for a microSD and the second place is shared. Xiaomi engineers often sample metal in such a way that the memory card is installed overrides the contacts of the second SIM, in which case you have to choose between two SIMs without a memory card, or one SIM and a flash drive.
☑️ Correct installation of maps
When you set up the card, it's important to be oriented. The tray usually has a schematic image showing how the card should lie. The bevelled angle of the nano-SIM should match the bevelled angle in the metal frame of the tray. If the card doesn't lie flat and protrudes above the edges, don't push it -- you risk damaging the contacts or the card itself.
| Slot type | Slot 1 | Slot 2 | Slot 3 (MicroSD) |
|---|---|---|---|
| Classical. | SIM nano | SIM nano | MicroSD (separately) |
| Hybrid (Option A) | SIM nano | SIM nano | Not used. |
| Hybrid (Option B) | SIM nano | MicroSD | Not used. |
| Triple (rare) | SIM nano | SIM nano | MicroSD (side by side) |
After placing the cards, gently press the tray back into the case until a characteristic click. Make sure that the frame is level with the body and does not protrude outwards, which could disrupt the moisture protection (if claimed) or lead to breakage when wearing the case.
Installation Nuances in Redmi and POCO models
Redmi and POCO lines often use more budget-friendly solutions in the design of the case, which can affect the ease of extraction of the tray. In some models, for example, the Redmi 9 series or the POCO M3, the tray can sit very tightly due to the peculiarities of assembly or dust. If the tray is not removed with a light press, try tapping the phone with the edge of the palm in the area of the hole to slightly shift the mechanism.
Another feature of public sector workers is that they don't have a clear fixation of the card in the frame. Unlike flagships, where the card is kept at the expense of the exact size, in budget trays it can fall out. It is recommended to slightly hold the card with your finger when inserting the tray into the phone so that it does not shift at the most inopportune moment.
What to do if the tray is stuck?
Owners of side-button models (such as the Redmi Note 10 and later) should be especially careful when removing the tray located on the same edge. There is a risk of accidentally pressing the on button or, worse, damaging the button plume if the key slips. Always lock the phone securely in your hand.
Some users have noted that in cheap cases, the paper clip opening may be shifted or too narrow, in which case it is better to temporarily remove the protective case to gain direct access to the extraction mechanism without the risk of scratching the screen or case.
Software setting up Dual SIM after installation
Once the cards are physically installed and the smartphone is turned on, the MIUI Android system will automatically detect new modules, you will see notifications of registration on the network, but for comfortable operation you need to set priorities correctly, otherwise the phone can start to put down the battery, constantly switching between towers of different operators in the area of poor reception.
Go to the Settings menu, then select a paragraph. SIM-This shows both cards, click on each to give clear names like "Work" and "Personal" or to indicate operators, so you don't get confused about which number is coming from, especially if both operators are on the same network.
The key is to set the default settings, and the system will suggest selecting a card for:
- 📞 Calls: You can choose a specific SIM Or the "Always Ask" mode".
- 🌐 Mobile Internet: Here it is important to choose a card with unlimited traffic or the best coverage in your area.
- 💬 SMS-Messages: usually choose the main SIM, so as not to miss the confirmation codes from banks.
It is important to note the 4G function is preferable. In older versions of MIUI with two SIMs enabled, the second could only work in 2G/3G mode. Modern Snapdragon and MediaTek processors support Dual 4G, but this option sometimes needs to be activated manually in additional network settings so that both cards catch fast Internet (although data will only be transmitted through one at a time).
⚠️ Note: When activating the second SIM-maps may require confirmation through some regions USSD-code or reboot of the device, if the network does not appear through 2-3 minutes, reboot manually.
Solving problems with the definition of the second SIM
There are times when the card is physically inserted, but the phone says "No SIM" or "Not defined." First of all, check the contacts. Wipe the golden contacts of the SIMKA with soft dry cloth. Finger fat or oxidation can prevent contact. Also make sure the card is not cut curved - in narrow trays Xiaomi even millimeter ledge can block the press.
The second common problem is frequency incompatibility or operator locking. SIM-cards (issued more than) 5-7 years ago, they may not be up to date 4G/LTE Or have a non-standard chip size, and in this case, the easiest way to contact the communication salon for a free card replacement with a number saved.
If the problem is software, try resetting your network settings. Go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. This action will not delete your personal data, but will return network settings to factory values, which often helps make a phone with a caprino module friends.
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If the phone can't see SIM-If you put it in another smartphone, if it doesn't work there, the problem is the SIM itself, if it works, it's the slot or the software on the phone.
Features of working with eSIM in new models
While the issue is more often physical cards, eSIM technology, which is gradually being introduced into new Xiaomi models of global versions, cannot be ignored.The electronic SIM card allows you to add a second number without having to open the tray. This is ideal for travelers buying local rates, or for those who want to save space under the microSD in the hybrid slot.
The eSIM activation process is fully digital: you scan QR-The code provided by the operator is in the settings menu. Unlike a physical card, the eSIM cannot be lost or broken mechanically. However, it is worth remembering that it will not be possible to move such a SIM to another phone with a simple extraction - you will need to re-activate the operator's activation procedure.
At the moment in Russia, eSIM support on Xiaomi smartphones is limited by law and technically, but for users who are abroad or using global firmware, this is a great alternative to the second physical slot. → SIM-maps and mobile networks → Add a tariff plan.