Installing a carrier card is the first and most important step after buying a new smartphone. Despite the fact that the procedure seems elementary, owners of Xiaomi and Redmi devices often face nuances that can damage the tray or the plate itself. Modern gadgets of the Chinese brand have different mechanisms for retrieving the slot, and improper handling of them is fraught with breakdown.
In this article, we will discuss how to properly install a sim card in shaomi to avoid common errors, learn about the differences in the design of trays of different models, understand the formats of chips and understand what to do if after installation, the device does not see the network.
Before you pick up a paper clip, you need to determine the type of tray in your device, which not only determines the algorithm of actions, but also the risk of damage to the mechanism. In modern devices, the tray can be retractable, combined or combined with control buttons.
It is also important to prepare the workplace. It is recommended to perform the procedure over the soft-coated table to avoid losing small parts or falling the phone. Make sure that your hands are dry and clean, as fat and moisture can negatively affect the contacts.
Tool preparation and SIM format verification
The first thing you need to do is make sure that your SIM card size is up to the standard required by a particular smartphone model.Today, the absolute standard for all current Xiaomi, Poco and Redmi devices is the Nano-SIM format. It is the smallest of the existing plates, almost devoid of plastic edging around the chip.
If your SIM card is larger (Micro-SIM or standard), don't try to force it or cut it with eye scissors. Using homemade adapters or cropped cards can lead to a tray getting stuck or damage to the reader inside the case.
To extract the tray, you'll need a special key that comes with the phone. If it's lost, a regular paper clip or a thin needle will do. The main requirement for the tool is that it must be thin enough to enter the hole, but strong enough not to bend when pressed. Use of too thick objects such as toothpicks or pins is strictly prohibited, as it can damage the extract sensor.
It is also worth turning off the smartphone before you start manipulating it, and although most modern phones support hot replacement, it is safer to turn the device off to install or replace the card format, allowing the system to correctly recognize the new operator when you turn on and avoid software errors of registration on the network.
⚠️ Warning: Never use sharp objects like knives or sewers to remove the tray. One wrong move can damage not only the body, but also the internal plumes if the hole is not located correctly.
Determining the type of tray in your Xiaomi
The design of a SIM card slot can vary significantly depending on the price segment and year of the device’s release, and understanding the type of tray you have will help you avoid awkward situations when a user tries to squeeze out a non-existent mechanism.
- 📱 Retractable tray: The most common option, located on the end of the case, has a small hole for the key and extends when pressed.
- 🔋 Removable cover: Found in the budget models of the Redmi series of earlier years of release. Requires the removal of the back cover and the removal of the battery to access the slot.
- 💳 Combined slot: A tray in which you can install either two SIM cards, or one SIM card and a MicroSD memory card.
Flagship owners should be especially careful. In some devices, such as the Mi Mix series or some Xiaomi 13/14 versions, the tray may have a sealed rubber pad to protect against water. When installing the card, you need to make sure that the pad does not wrap and fits tightly to the edges, otherwise the moisture protection will be broken.
If you can’t find a key hole on the side faces, look carefully at the perimeter of the device. In rare cases, especially in protected series or specific regional versions, access to the slot can be hidden under a decorative plug or combined with other design elements. However, for 99% of Xiaomi smartphones, the rule is: look for a narrow slot on the lower or upper end.
Step-by-step: installation of Nano-SIM
The process of installing a SIM card requires care and care. Follow the algorithm to ensure that the communication module works correctly. First, take the key-clip and insert it into a circular hole next to the tray. Press smoothly but confidently until the tray jumps.
Take the tray out completely and put it on the table. Notice the metal cutouts — they repeat the outlines of the Nano-SIM. Place the map in a designated place so that the bevelled corner matches the shape of the tray. Golden contacts must necessarily look down to the smartphone screen (or up if you look at the tray from the contacts side).
☑️ Installation checklist
Once the card is laid, carefully insert the tray back into the phone. It's important not to mix the sides: the tray should enter easily, effortlessly. If you feel resistance, don't push! Take it out, flip it over and try again. A forced installation can break the plastic guides inside the case.
Turn on the device. Once you load MIUI or HyperOS, you should see signal level icons and operator designation (e.g., "MTS", "Beeline", "Megafon") at the top of the screen. If there are no icons, check if the slot is activated in the settings.
⚠️ Warning: Make sure the SIM card sits tightly in the tray and doesn't hang around.If the card isn't inserted to the end, vibrations in calls can cause contact loss and the network to suddenly disappear.
Features of installation in models with two SIM
Most Xiaomi smartphones support two SIM cards at the same time, which is convenient for separating personal and business calls or using different tariff plans.
When you install two cards, it is important to keep the order if you plan to use one as the main mobile Internet slot. Usually, the SIM 1 slot is the priority for data transfer, although this can be changed softwarely.
In some Hybrid SIM tray models, the second cell may be occupied by a memory card, in which case you can't use two SIM cards at the same time, you have to choose between two SIMs or one SIM and a MicroSD flash card. Study the circuit on the tray itself, which usually shows which cell is responsible for what.
If you don't recognize one card after you set up two cards, try swapping them. Sometimes the contacts in one of the slots can oxidize or have micro-defects, and reshuffling them will help you identify the problem. PIN-code, unless you have entered it when you have switched on.
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Use different rates for calls and the Internet: for example, a cheap package of minutes on one SIM and unlimited Internet on another to save your budget.
ESIM: An Alternative to a Physical Card
Modern flagships Xiaomi increasingly equipped with support for eSIM technology. It is a built-in digital module that does not require a physical tray. QR-code provided by the operator.
The eSIM setup process is completely software-based. You have to go to settings, select the option to add a fare, and follow the on-screen instructions.This frees up the physical slot for a second normal SIM or memory card, which is a huge plus for travelers.
However, it is worth remembering that not all carriers and not all regions support this technology. Before buying a phone with an eSIM, check with your provider the ability to connect a virtual number, and the eSIM can not be physically moved to another phone if your device’s current breaks.
The advantage of eSIM is that you can store multiple profiles at the same time, so you can have, for example, five different numbers from different countries and switch between them in the settings menu, without having to carry a plastic card portfolio with you.
How to transfer eSIM to a new phone?
Diagnosis: what to do if the smartphone does not see the SIM
There are times when, after all the right actions, the phone says, "No SIM card" or "Only emergency calls." Don't panic. First of all, reboot the device. This trivial action solves 80% of the software glitches associated with logging into the network.
If the reboot didn't work, remove the card and wipe its golden contacts with a soft eraser or dry cloth without pile. There may be traces of fat or oxides on the surface that interfere with contact. Also blow out the slot in the phone to remove dust.
Check the network settings. Sometimes a particular slot is disabled. Go to Settings. → SIM-maps and mobile networks, and make sure the switch opposite the card is activated, and check if you have an "In Airplane" mode that locks all radios.
In rare cases, the problem may be with the SIM card itself, it may have demagnetized or damaged the chip, try inserting the same card into another phone, and if it doesn't work there, the operator has a problem, or the card's plastic, you have to go to the salon to replace it.
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If the phone doesn’t see the SIM card, the algorithm is simple: reboot → clean contacts → check the slot settings → test the card in another device.
It is also worth mentioning the lock by IMEI. If the phone was stolen or bought from hands and is listed in the database of lost, it can block the work of any SIM cards.
| Problem. | Possible cause | Decision |
|---|---|---|
| Writes "No net" | Failure of the operator or a bad signal | Check the coverage, reboot the phone |
| Demands. PUK-code | Three times incorrect PIN | Enter PUK from the envelope or operator LC |
| Can't see the second SIM | Slot disabled in settings | Activate in the menu "SIM-cards" |
| It's constantly losing its signal. | Poor contact or damage to the tray | Clean contacts, replace tray |