Modern Xiaomi, Redmi and POCO smartphones are equipped with a reliable tray fitting system, which requires careful extraction. Wrong actions can damage the mechanism or the access card itself. Owners often face difficulties during the initial installation phase, when it is necessary to accurately combine contacts and notches.
In this article, we will discuss in detail how to insert a SIM card into a Xiaomi phone of various modifications. You will learn about the types of trays, the nuances of working with hybrid slots and how to configure the network for stable operation on the Internet. Proper installation provides a stable signal and prolongs the life of contacts.
Before you start physically impacting the device, you need to prepare, you need a staple from the kit or a thin needle, make sure your hands are clean and dry, so that you don't leave any traces of fat on the gold contacts of the card, which can disrupt signal transmission.
Types of trays for SIM-cards in Xiaomi smartphones
The company's engineers use several design options for memory card slots and SIM. Understanding the type of your tray is critical, as trying to insert a card in the wrong compartment can lead to mechanical jamming. Most often, a combined version allows you to use two SIM cards or one SIM card and a microSD memory card.
Redmi’s budget models often use classic trays, where both SIM positions are isolated from each other. The Mi and Xiaomi flagship lines have been dominated by hybrid solutions in recent years, saving the interior space of the case, giving the user a choice between memory expansion and number two.
Special attention should be paid to the American versions of smartphones, which can come without a physical card tray at all, using eSIM technology, where the operator profile is loaded programmatically, for which the physical insertion of cards is not designed constructively, and attempts to open will lead to a loss of warranty.
You can visually determine the type of slot by looking at the end of the device. If you see two separate notches for cards of different sizes, you have a standard double slot. If the notch is one, but divided into two zones, or has a complex shape, it is likely a hybrid system that requires careful study of the circuitry on the tray itself.
Tool preparation and tray extraction
You don't need a complicated toolkit to get started. There's always a special metal key clip in the box with the new device. If it's lost, a regular sewing needle or pin will do, but you should use it with extreme caution so as not to damage the ejection mechanism.
Find a small circular hole on the end of your smartphone. Depending on the Xiaomi model, it can be on the bottom edge next to the Type-C charging port or on the top end. Sometimes the hole is combined with a microphone, so it's important not to confuse them: the tray hole is usually in a recess or has a clear metal rim.
Insert the tip of the paper clip into the hole strictly perpendicular to the body. You don't have to push with all your strength; you have to press with enough confidence, but smoothly. You have to feel a slight click and see how the tray moved out a little bit, and then you can carefully remove it with your fingers.
☑️ Pre-installing check
There is a common misconception that you can only retrieve the tray on a phone that is turned off. Current Hot-Swap standards allow you to change cards on the fly, but to initially set up the network and avoid software failures in determining the operator, it is better to restart the device after installation.
⚠️ Warning: Never use knives, scissors or other sharp objects with a wide blade to remove the tray, which can damage the sensor of the presence of the card inside the case or unsettle the spring mechanism, after which the tray will cease to fix.
Proper installation of SIM-card in the tray
The most important step is to place the card in the lodge, and the tray has a well-defined shape that will not allow you to install the card incorrectly, if you pay attention. Pay attention to the bevelled corner of the card plastic: it should perfectly match the notch in the tray.
Hybrid slots often have a lot of confusion with numbering, usually with the numbers 1 and 2 on the metal plate, or a schematic picture on it, the SIM 1 position is most often for the main card, and the SIM 2 or SD for the second SIM or flash drive. In some models, the tray has two sides: flipping it, you will get to the second slot.
If the card is old and has the dimensions of a mini-SIM or micro-SIM, and your smartphone requires a nano-SIM, be sure to use an adapter. However, be careful: cheap adapters can be incorrectly thick and stuck inside the phone.
What to do if the card is not held in the tray?
Once you're laid, carefully insert the tray back into the body. Watch your orientation: it should come in smoothly, without resistance. If you feel a push, don't push. Take out the tray, flip it 180 degrees and try again. The right side will come in before you click.
Network setting and selection of the main slot
After switching on the phone, the system will automatically detect a new one. SIM-In the interface. MIUI Or HyperOS will be notified of the registration on the network, and if there are two cards, the operating system will suggest assigning their functions: which will be used for default calls and which for mobile Internet.
To change the settings go to the Settings menu → SIM-And you'll see a list of maps installed here, and if you click on a specific card, you can fine-tune its behavior in detail, roaming data, choosing the type of network (4G/5G) or change the name to appear in the call log.
It is important to properly distribute the load between slots. In most modern Xiaomi models, the first slot is a priority for high-speed Internet. If you use one card for calls and one for the Internet, it makes sense to assign an Internet tariff to slot 1 for maximum speed.
| Parameter | Slot 1 (Main) | Slot 2 (Additional) | Hybrid mode |
|---|---|---|---|
| Support for 5G support | Yes (if available) | Limitedly. | Only one SIM. |
| VoLTE / Wi-Fi Calls | Full support | Full support | Depends on the card. |
| Expansion of memory | Unavailable | microSD to 1 TB | microSD or SIM |
| Priority of data | High-pitched | Medium. | N/D |
Remember that when you activate the second SIM-Mobile Internet speed on the first card may decrease to standards 3G or EDGE This is a technical limitation of many dual-symbol devices, which is solved by using the VoLTE function, if it is supported by your operator.
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Use Flight Mode for 10 seconds after installing the card if the phone doesn't see the network right away, this will force the radio to restart without fully restarting the device.
Solution: The phone can't see SIM-map
When you don't get a map, it's rare, but it's possible. First, check the cleanliness of the contacts. You wipe the gold plate of the map with a soft dry cloth. Oxidation or dust can make the connection.
The second step is to check the card itself, put it in another phone, and if there's no signal, there's a problem with the carrier or the card chip, and then you need to contact the salon to replace the SIM with a new one, and you keep the number.
If the card is working but Xiaomi ignores it, 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 files, but will return network settings to factory values.
⚠️ Note: If the phone is writing «SIM-Card blocked or requested PUK-code, don't enter random combinations. PUK-The code will permanently block the card, and it can be restored only by the operator.
In rare cases, the problem is software firmware failure. Make sure your device is updated to the latest version of MIUI. Errors in the radio module are often corrected by security patches that come with system updates.
Features of using eSIM in Xiaomi
The brand's flagship models are increasingly supporting eSIM technology, a virtual SIM card embedded in a factory board, and you don't have to physically insert anything to activate it. You just need to scan it. QR-code provided by the operator through the settings menu.
To add eSIM, go to Settings → SIM-maps and mobile networks → Add a plan. The smartphone camera reads the code, and in a few seconds you'll get a full number two. It's convenient for travel, allowing you to buy local rates without buying physical cards.
The main advantage of eSIM is the ability to store multiple carrier profiles and switch between them programmatically, you can have five numbers in different countries, but actively use only one or two at a time, depending on the design of the device.
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eSIM completely eliminates the mechanical wear of the contacts and the risk of losing the miniature nano-SIM, which makes this format the most promising for the future.
When selling a phone, be sure to remove eSIM profiles from settings or perform a complete device reset. Unlike a physical card that you just take out, the virtual profile remains in the phone's memory, and the new owner could theoretically access your number if not cleaned up.
Security and data security on SIM
Many users store their contacts on the SIM card and SMS-When you switch to a new phone or change your card, this data may be lost. In the Xiaomi ecosystem, it is recommended to use synchronization with Mi Account or Google Contacts.
To copy contacts from the old SIM Go to the Contacts app, select Import/Export and specify the source SIM-It's a map, and destination is a phone or Google. It'll take a few seconds, but it'll keep your phone book safe.
Check regularly if your card is activated with roaming data if you do not plan to travel abroad. Accidental connection to a foreign network can lead to significant write-offs. → Data roaming.