Installing a mobile operator card is the first and most important step after unpacking a new device. Despite the seemingly simple procedure, Xiaomi owners often face difficulties due to the different tray form factors in different models. Installation incorrectly can lead to the device simply not seeing the network or, worse, the slot will be damaged.
In this guide, we will take a closer look at the tray extraction process, determine the orientation of the chip, and look at the features of combined slots. We will focus not only on standard models, but also on nuances that are often overlooked by inexperienced users.
Careful adherence to the algorithm ensures stable communication and no mechanical damage to the internal contacts of your gadget. Let's get started preparing the tools and the device itself for operation.
Tool preparation and tray type determination
Before you start physically impacting the body, make sure you have the right tool on hand.Combined with most Xiaomi smartphones comes a special metal clip, but it is easy to lose.Alternatively, you can use a thin needle or stationery clip, straightened to the desired condition.
It is crucial that the tool be sharp and thin, as the extraction hole is often drowned deep into the body. Using blunt objects or, worse still, toothpicks can lead to a breakdown of the mechanism or damage to the body. Mechanical damage to the tray is a common cause of subsequent problems with extraction.
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If the original paperclip is lost, use a pin, but make sure that its tip is not too sharp to avoid injury, and not too blunt to slip.
There are two main types of trays used in the Mi line: standard double and combined (hybrid). In the first case, there are two independent spaces under the nano-SIM. In the second, one place under the SIM and the second under the microSD card, or the ability to install two SIMs, but without the possibility of expanding memory.
Visually inspect the end of the device. The tray is usually located at the bottom or top of the case, depending on the year of the model's release. Near the hole is often engraved indicating the configuration of the slots, but you should not rely on it alone.
Algorithm of extracting the tray for a SIM card
The extraction process requires precision and the right angle of inclination of the tool. Put the paper clip in a round hole at the end of the tray perpendicular to the plane of the body. No need to push with all the force; enough confident, but gentle press.
Once you feel a slight click and the spring mechanism is triggered, the tray will extend a few millimeters, and then you can effortlessly remove it with your fingers. If the tray is not extending, check if you have hit the hole, and try to slightly change the angle of the needle input.
☑️ Proper removal of the tray
Pay attention to the inner surface of the hole. If you see plastic parts in the mechanism, be very careful. The plastic pins inside the mechanism are quite fragile and can break if you handle it sloppy, making it impossible to re-install the tray without repair.
Once removed, carefully examine the tray itself, often with schematic markings on the surface showing how the map should lie, a scheme that is universal for most models, but it is always best to double-check visually before installation.
Orientation and installation of nano-SIM cards
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 nail. If your card is larger (micro or mini), it must be replaced in the operator's cabin or carefully trimmed according to a template, although the latter option is not recommended because of the risk of damaging the contacts.
The main rule of installation is that the chip should look down at the contacts of the tray, and the bevelled corner of the card should coincide with the beveled angle of the notch in the tray. You can't insert the card on the correct side if it doesn't match the contour, so don't use force.
What to do if the card is not included in the tray?
Double slot models often use a sandwich design, where one card is mounted on top of the other or in a special slot on the back of the tray, in which case the contact areas of both cards must be facing in one direction or according to the scheme on the tray itself.
Make sure the card fits tightly to the base and doesn't hang around. If the tray has a springy fixing mechanism, press it slightly until the characteristic click, although in most modern Xiaomi the card is simply embedded in the frame.
Features of installing a microSD memory card
If your smartphone supports memory expansion, you can use a second slot to install the microSD card. you will have to choose which is more important for you: two numbers or a large amount of memory.
The memory card is set in a similar way to the SIM card: downward contacts and a bevelled angle. However, unlike the SIM card, the microSD does not have a rigid fixation in some models and can pop out when moving sharply if the tray does not have special sides.
Once you have installed the memory card and turned on your phone, the system may suggest formatting the drive, which is normal for new cards, and select "Use as a portable storage" if you plan to transfer the card to other devices, or "Internal memory" if you want to expand the space for installing applications.
Pay attention to the speed of card recording. For high-resolution video recording or heavy applications, it is recommended to use U3 or V30 cards. Slow cards can cause system delays and brakes when shooting video.
Return of the tray to the smartphone case
Once the maps are successfully installed, you need to get the tray back into the case, and it's critical to be guided, and the tray has only one correct position, and it enters smoothly and without resistance.
If you feel a pressure when pushing the tray, don't push! Pull it out, flip it 180 degrees and try again. Forced upside-down pressing of the tray is guaranteed to break the contacts inside the smartphone or deform the tray itself.
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The tray must enter the body completely smoothly, and any resistance means that the orientation is incorrect.
Insert the tray until its outer edge is equal to the frame of the case. It should not stick outwards and should not fall inside. Properly installed tray ensures the tightness of the case (if the model is protected from moisture) and reliable contact with the board.
In some Xiaomi models, the tray may have a rubber seal. check its integrity before installing.A damaged seal reduces protection from dust and moisture, so in such cases it is recommended to be careful with the device in the future.
Network setup and troubleshooting
Once you turn on your smartphone, the system automatically detects a new SIM card, and the operator name and signal level will appear on the screen. If that doesn't happen, go to the settings menu. The path usually looks like this: Settings → SIM-maps and mobile networks.
In this section, you can set up your preferred SIM card for calls and mobile internet. Xiaomi allows you to flexibly manage two numbers by assigning different tunes or limiting traffic consumption for the second card.
| Problem. | Possible cause | Decision |
|---|---|---|
| No signal. | Incorrect installation | Remove and flip the SIM card |
| Defines only 1 SIM. | Inactive second slot | Enable in the settings Use SIM |
| No Internet. | No data operator selected | Select SIM in the "Mobile Internet" |
| Writes "No Network" | Operator problems | Check balance and coverage |
If your phone says "Sim card not detected" or "Emergency calls only," try wiping the contacts of the card with a soft eraser. Fat spots or oxidation can interfere with normal connection.
In rare cases, the problem is a software failure: try resetting the network to factory settings, which won't delete your personal files, but will return all the connection settings to the original state, which often solves the problem.
⚠️ Warning: Never try to insert a tray into the case unless it contains a SIM card or memory card, unless the tray design suggests it.An empty tray without a card in some models may bend and close contacts inside the phone.
⚠️ Warning: If you use a hand-cut SIM card, make sure it is not thicker than standard.A card that is too thick can get stuck in a tray and it will be extremely difficult to remove it without damaging your smartphone.