Modern smartphones of the Xiaomi brand are famous for their thoughtful design and high functionality, but even experienced users sometimes have difficulties with basic manipulations, such as installing a communication module. SIM-The card can not only lead to a lack of signal, but also to mechanical damage to the contacts of the device or tray, so it is important to understand the design of your model, as the engineers of the company are constantly experimenting with form factors and slots.
In this article, we will discuss in detail the process of installing a SIM card, from finding a tray on the case to software setting up the network after turning on the device. You will learn how hybrid slots differ from standard ones, how to correctly orient the chip during installation and what to do if the smartphone has stopped seeing the operator. A competent approach to this simple, at first glance, action will ensure stable mobile communication and prolong the life of the contact group of your gadget.
Before you start physically affecting the case, you need to make sure that you have all the tools you need at hand. Usually, a special key is bundled with new devices, but it is easy to replace with a regular stationery clip or a thin needle. The main thing is to act carefully, without undue pressure, so as not to damage the extraction mechanism, which in budget models can be made of fairly soft metal.
Search for tray and preparation of tools
The first step in the installation process is to accurately locate the SIM card slot. In most Xiaomi, Redmi and POCO models, the tray is located on one of the ends of the device, most often on the upper or lower end. Carefully inspect the side faces: you should notice a narrow elongated hole next to the round or oval contour of the tray. On some protected models or devices with moisture protection, the tray can be combined with volume or power buttons, which requires special care when extracting.
To remove the tray, you'll need a special metal key, which is usually in the box along with the warranty card and the instruction. If the original tool is lost, you can use a regular stationery clip by straightening one of its ends, or a thin sewing needle. Important: do not use thick objects such as toothpicks or pins, as they can break inside the hole or damage the latch mechanism, which will make it impossible to remove the tray in the future without disassembling the phone.
Insert the sharp end of the key or paper clip perpendicular to the hole and press with moderate force until a characteristic click. The tray should extend from the body by several millimeters, after which it can be gently tucked with the nail and fully removed. Pay attention to the orientation of the tray: on some models it can only be removed in one direction, and on others it can be bilateral. Do not use excessive force if the tray does not respond, it is better to check once again the correctness of the tool hitting the mechanism.
⚠️ Warning: Before removing the tray, it is strongly recommended to turn off the smartphone completely. SIM, power outage ensures that the system correctly recognizes the new card when turned on and eliminates the risk of short circuit contacts.
Definition of tray type and SIM format
Once the tray is removed, you need to determine its type, as it depends on whether you can use the memory card simultaneously with the second SIM card. There are two main types of trays used in Xiaomi devices: the standard dual slot and the hybrid. The standard version has two independent bays of the same size, designed exclusively for SIM-cards Nano-SIM format. This allows you to use two SIM cards of any operator at the same time without restrictions.
The hybrid tray is more complex in design, with one compartment for the first SIM card and the second compartment for the combined tray, and the combined tray can be fitted with either a second compartment. SIM-It's not technically possible to have a second SIM and a memory card simultaneously in a slot, and there's often a schematic marking on the tray surface that indicates which compartment is responsible for what, and the direction of the chip's installation.
As for the format of the card itself, all modern Xiaomi smartphones work exclusively with the Nano-SIM format. This is the smallest of the existing standards, which is a chip the size of a pinky fingernail without plastic edging. If your SIM is larger (Micro-SIM or standard Mini-SIM), it must be replaced by a carrier or carefully trimmed along the circuit using a special stencil, although the latter method carries the risk of damaging the chip and is not recommended.
Proper installation of SIM-card in the tray
The process of installing the card requires attention to detail, because the wrong orientation of the chip can lead to a lack of communication. Take the tray in your hands and find a schematic image on its surface that shows how the chip should lie. Usually, the golden contacts should look up, and the cut corner of the card should match the cut angle of the notch in the tray. If you confuse the sides, the map simply will not fall into the designated place.
Carefully place the Nano-SIM in the appropriate groove.The card should sit tightly, without backlash and protruding beyond the edges of the tray.If you use a hybrid slot and plan to install a memory card, make sure the microSD contacts are directed in the opposite direction from the SIM contacts, as indicated in the diagram. After installation, slightly press the card with your finger to make sure it is fixed in the grooves, but do not overdo it to damage the fragile plastic tray.
Once the card is installed, insert the tray back into the smartphone case. It's also important to keep the orientation: the tray only enters one side. Usually, the bevelled corner of the tray or the location of the contacts prompts the correct position. Push the tray smoothly, without jerks, until completely snapped. If the tray is not fully entered, it will protrude from the body, which will violate the tightness of the device and can lead to moisture.
☑️ Installation verification SIM
Prior to installation, wipe the golden surface of the SIM card with a soft dry cloth to remove fat and dust. Even microscopic contamination can prevent normal electrical contact, leading to periodic network losses or reading errors.
Network settings after installation
After physical installation of the SIM card and switching on the smartphone, the operating system MIUI or HyperOS should automatically detect a new communication module, and at the top of the screen, in the status bar, you'll see signal strength indicators and operator name indicators. 1-2 You have to go to the device settings to manually check the settings. Usually, the path to settings is: → SIM-maps and mobile networks.
In the SIM management menu, you'll see a list of modules installed. You can activate or deactivate a particular SIM card, assign it to the mobile Internet or to make default calls. Each SIM card has a separate set of options, including network type selection (4G/5G), roaming enabled and access point (APN) naming setups. In most cases, APN settings are loaded automatically, but sometimes have to be manually prescribed by the operator.
If your smartphone offers to update your operator settings or download your network profile, you can take this action, especially for virtual operators or when you move to new communication standards, and you can set your SIM card schedule to turn on and off, which is useful for saving battery power at night or for splitting work and personal time.
⚠️ Note: When setting up your mobile network, keep an eye out for data roaming. If you are in your home region, enabling this feature can lead to unintentional connections to affiliate networks and debits, even if you haven’t gone anywhere. Turn on roaming only when actually leaving the region of registration of the SIM card.
Solution: the phone does not see the SIM card
One of the most common problems is when, after installing a SIM card, the smartphone writes “No”. SIM-"Put in the cards" or "Put in" SIM-First of all, make sure that the card is installed correctly and the contacts are not contaminated. Try to remove the tray, wipe the contacts of the SIM card with a wipe or an alcohol napkin and insert it again, making sure that it fits tightly. Sometimes it helps to install a card in another slot if there are two of them.
The second reason could be a software failure in the modem, in which case it helps to reboot the device or reset network settings. To reset, go to the Settings menu → Connection and Sharing → Reset Wi-Fi, mobile network and Bluetooth. This action will return all network settings to factory values, but will not delete your personal files, contacts or applications. After reset, the phone will again try to register with the operator's network.
If the software methods don't work, maybe the problem lies in the communication module itself or in the mechanical damage to the tray. Check the SIM card on another phone: if it works there, then the problem is in the Xiaomi smartphone. If the card is not read anywhere, contact the operator's salon to replace the SIM card, as over time the contacts on the chip can oxidize or erase.
What to do if the contact in the tray is burned?
Compatibility table and frequent errors
To organize information about possible problems and types of trays in different series of devices, it is convenient to use a summary table, which will help you quickly navigate the features of your model and avoid typical installation errors.
| Xiaomi Series | Type of tray | SIM format | Frequent error |
|---|---|---|---|
| Xiaomi (Flagships) | Double Nano-SIM | Nano-SIM |
Analyzing the table, you can see that most modern devices have switched to the Nano-SIM format. Using adapters (frames) into which a small SIM card is inserted to be installed in a large slot often leads to a stuck structure inside the phone. The metal frame can stick to the contacts or jam the extraction mechanism, so it is better to abandon such adapters.
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Use the original operator SIM card. Hand-cut cards often have uneven edges that can scratch contacts inside the tray or get stuck when extracted. It's better to get a new Nano-SIM at the operator's office for free.
Using eSIM in Xiaomi devices
In addition to physical SIM cards, many new Xiaomi models support eSIM technology, a built-in digital SIM card.This allows you to activate the tariff plan without having to visit the operator’s office or wait for the delivery of plastic. QR-code provided by the operator through the settings menu of the mobile network.
The eSIM setup process is completely software-based and takes a few minutes. SIM-Select the option "Add a tariff plan" and follow the instructions on the screen. This is convenient for those who often travel or want to use two numbers on the same device, where the second slot is occupied by a memory card in a hybrid tray.
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The eSIM technology completely eliminates mechanical wear of the tray and contacts, since the chip is built into the manufacturer's board and does not require physical intervention of the user.
Can I use another carrier’s SIM card in a locked phone?
Why does the phone say "Unknown" SIM-map"?
Is it safe to take out your SIM card without turning off your phone?
How to clean SIM card contacts if they are oxidized?
In conclusion, it is worth noting that the correct installation of the SIM card is the foundation of stable operation of your smartphone. Compliance with simple rules of hygiene of contacts, attentiveness to the orientation of the tray and understanding of the type of slot will avoid most communication problems. Modern Xiaomi devices are designed with the user's convenience, but require careful treatment of mechanical elements.