How to change SIM-Map in the Xiaomi phone: the full guide

Replacement SIM-Maps are one of the most basic, but critical operations when using any smartphone, and Xiaomi brand devices are no exception. Often users face the need to replace the old media with a new one with support. 4G, You can also install a card of another operator for a better rate, or you can simply insert a SIM into a gadget you just bought, and although the process seems simple, there are nuances that you can ignore that can damage the tray or cause the communication module to malfunction.

In modern models of smartphones Redmi and Poco, the mechanism of retrieval of the slot can vary slightly depending on the year of release and the price segment of the device. SIM-card SIM-MicroSD card and memory card. It is important to understand the architecture of your particular device so as not to damage the contacts or mechanical part of the case if you carelessly handle.

In this article, we will discuss the entire process in detail, from finding a clip in the bundle to fine-tuning network parameters in the MIUI or HyperOS operating system. We will look at typical errors, methods for diagnosing signal problems and answer questions that often arise from users when they first install a new communication module.

Preparing for replacement: tools and precautions

Before you start physically removing the tray, make sure you have all the tools you need on hand. Each new Xiaomi smartphone always comes with a special metal clip designed for this purpose. If the original tool is lost, you can use a regular stationery clip that needs to be straightened beforehand, or a thin needle, but in the latter case, you should take special care not to scratch the case.

The critical step is to turn the device off, although current standards allow for retrieval and insertion. SIM-Hot Swap, specialists in repair of mobile equipment strongly recommend completely turn off the smartphone before any manipulations with the tray. This prevents possible short circuit contacts, a voltage jump in the power supply of the communication module and software failures when the system does not have time to correctly redistribute resources between slots.

⚠️ Warning: Never use sharp objects such as knives, wide-eyed pins or sewers to remove the tray, which can damage the latch mechanism inside the case or penetrate the insulation, causing the slot to break permanently.

It's also worth preparing for yourself. SIM-Make sure it has the right format — modern smartphones use the Nano-SIM standard. If your card is larger, it should be carefully trimmed along the circuit or replaced by a carrier. Do not try to insert a Micro-SIM or Standard-SIM card into the slot by force, even if it seems suitable in width - the thickness of the contacts may not match, which will lead to their bending.

Algorithm of tray extraction and installation SIM-map

The process of physical SIM replacement in Xiaomi smartphones is unified for most models, but requires attention to detail. The tray is usually located on one of the ends of the device: in classic models, this is the lower edge, and in some protected or specific versions it can be on top or side.

Insert the paper clips into the hole perpendicular to the phone's body. Press until you feel a slight click and the spring mechanism pushes the tray out. Remove it completely, but try not to pull too sharply so as not to damage the delicate contacts inside the socket. On the surface of the tray you will see notches, the shape of which exactly repeats the contour SIM-Notice the bevelled corner of the map, which should match the bevelled angle in the tray notch.

Once the card is placed in the tray, carefully enter it back into the case. It's important not to confuse the sides: the tray only enters one side, and if you feel resistance, do not press. Turn it 180 degrees and try again. A properly installed tray should equal the phone body, not protruding outwards and not falling inwards.

Turn on the device and wait for the operating system to boot. Usually, the phone automatically detects a new one. SIM-map and request PIN-If the download screen is gone but the network icons are not showing, check if the card is tight. Sometimes you need a little pressure on the tray when it's off to improve the contact, but do it very carefully.

Set up network parameters and select SIM-default-card

After successful installation of the physical media, you need to configure the software part. MIUI Provides flexible tools to manage two or more SIM cards. To access settings, go to Settings menu, then select SIM-Maps and mobile networks. This shows all the connected modules with their names and operators.

In this section, you can prioritize traffic and voice, for example, you can set calls to always be made through the SIM of operator A, and mobile Internet works through operator B. This is especially true for users who use one card for cheap minutes and another for unlimited Internet.

Special attention should be paid to the type of preferred network. In the settings menu of each SIM card there is a network type. It is recommended to choose the mode Preferably LTE or 5G/LTE/3G/2G (auto) so that the phone switches to the maximum available speed on its own. If you are in the area of poor coverage, you can force switch to Only 3G or Only 2G to save battery power, although the data transfer speed will be significantly reduced.

Also available in this menu is the network name display function, which is to make sure that it is activated so you can always see which operator's tower the device is connected to, which is especially useful in border areas or places where virtual operators (MVNOs) operate using other companies' infrastructure.

Use of combined slot and memory cards

Many of the low-end and mid-end models of Redmi and Poco are equipped with a hybrid slot, which means that the second compartment in the tray can take either a second one. SIM-So, you can have a card, or a microSD card, but not at the same time, and the tray design has two sides, one side of the tray, and the other side of the tray, the second SIM card, the memory card.

If you have to use two SIM cards and a memory card at the same time, you can't do it with regular means. SIM-These adapters have thin contacts and allow you to insert a sandwich into a microSD slot, and the phone will see both the memory and the second SIM.

When using adapters or hybrid slots, it is important to keep an eye on the thickness of the structure. A too thick adapter may keep the tray from closing until the end, leading to dust and moisture getting inside the case, as well as poor contact. Always make sure that the tray enters the case without visible effort or gaps.

Diagnostics: The phone can't see SIM-map

When the phone is replaced with a SIM card, it says, No. SIM-"Put in the cards" or "Put in" SIM-It's a pretty common card. The first step in diagnosis is to check the purity of the contacts. Wipe the golden part of the SIM card with a soft dry cloth or a rubber strip. Oxidation or greasy spots from the fingers can interfere with normal reading.

If the cleaning didn’t work, try installing the SIM card in another slot (if there are two of them). If the card worked in the second slot, then the problem in the first slot is probably contamination of contacts inside the slot or mechanical damage. If the card is not readable in either slot, but the other SIM card works normally, the problem may be in the card itself or its incompatibility with the operator’s networks.

⚠️ Note: If the phone says “No service” or shows a cross instead of the signal level, but the SIM card itself sees, the problem may not be in the physical setting, but in the settings. APN (access points) or locking by the operator due to non-payment.

Another cause could be a software failure. Try resetting your network settings. Go to Settings → Connection & Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Note that this action will remove saved Wi-Fi passwords and conjugated Bluetooth devices, but often solves network logging problems.

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If you change your phone, you leave the old one. SIM-card, ask the operator to release a duplicate with support 4G/LTE. Older cards issued by more 5-7 Years ago, modern encryption and speed standards may not support them, even if the phone supports them technically.

Frequent Questions and Answers (FAQ)

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Proper installation SIM-Maps and timely updates of network settings are the key to stable communication and fast Internet on your Xiaomi.