Installing the communication module is the first and most critical step after unpacking a new smartphone. Owners of Xiaomi, Redmi and Poco devices often encounter different tray designs, which can cause confusion for beginners. Installation of the chip can damage the contacts or mechanically get stuck inside the case.
In this article, we will discuss in detail the algorithm of actions for all types of modern devices of the Chinese brand, you will learn about the differences between combined and separate slots, as well as get answers to questions that arise when you have problems with network definition.
Accuracy ensures stable mobile communication and Internet access at all times, and we will look at the nuances of working with hybrid slots, where you have to choose between a second SIM card and a memory card.
Tool preparation and inspection of the device
Before you start removing the tray, you need to prepare a workspace with good lighting. You need a special key-clip, which usually comes with a box, or a thin needle with a blunt end. The use of sharp objects like pins is not recommended, as you can accidentally damage the spring mechanism or scratch the body.
Take a close look at the ends of your smartphone. In most modern Xiaomi models, the extraction hole is on the bottom edge, next to the USB Type-C charging port or headphone jack. However, in some protected models or devices with moisture protection, the tray can be located on the side.
⚠️ Warning: Before removing the tray, make sure your hands are dry and clean.Damp or dust entering the case when the slot is open can lead to oxidation of the motherboard contacts.
If you use a third-party tool, make sure that its diameter corresponds to the hole. Too thick needle can get stuck, and too thin - just bend without activating the ejection mechanism.
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If your native key is lost, use a paper clip to straighten one of its ends at right angles, which is the perfect replacement for the original tool.
Types of trays in Xiaomi smartphones
The design of a SIM card slot depends on the price segment and the year of release of the device, and understanding the type of your tray will help to avoid errors in installation and correctly allocate storage space.
In budget and mid-budget models, a combined version is often found: it allows you to install either two SIM cards, or one SIM card and one MicroSD memory card. Flagship models are more often equipped with two independent SIM card slots, but do not have the ability to expand memory.
- 📱 Single tray: Designed for only one Nano-SIM SIM card, the memory card is installed separately or not supported at all.
- 💾 Hybrid slot (2+1): Universal solution, where the second place is divided between the second SIM card and memory card.
- 🔌 Separate slots: Two independent slots for two SIM cards, sometimes with the option of installing a memory card in a separate third slot.
You can determine the type of tray visually by comparing it with the image on the protective film of the smartphone or in the instructions, and information can be found in the specifications on the official website of the manufacturer.
Step-by-step instructions for installing Nano-SIM
Current communication standards require the use of Nano-SIM cards, which are the most compact, and if your card is old, it must be replaced at the office of a telecom operator or carefully trimmed into a special frame, although the latter method carries the risk of damage to the chip.
Insert the key into the tray hole perpendicular to the end of the device and slightly press until the characteristic click. The tray should extend a few millimeters, after which it can be carefully removed with your fingers. Do not use excessive force so as not to break the mechanism.
☑️ Algorithm of SIM card installation
Put the SIM card in the notch of the tray. Notice the bevelled angle of the plastic, which should match the shape of the notch. The contacts in golden color should be directed down to the motherboard, if you look at the tray from above.
Carefully insert the tray back into the body, keeping the orientation in mind. Push it to a slight click, making sure it aligns with the body and does not protrude outward. If the tray does not enter easily, do not press — check the correct orientation map.
⚠️ Warning: Never try to force the tray into the tray unless it enters, which can cause the tray to break its internal contacts or deform itself, and then it will be extremely difficult to remove it.
Features of hybrid slots
The hybrid design is popular in the Redmi Note and Mi series of the past, and the main challenge is that it is physically impossible to use two SIM cards and a memory card at the same time, unless you use cloud services or a large internal drive.
When you install a microSD card in the second compartment, the second SIM card is no longer defined by the system, and it's important to consider users who are critical to both phone numbers, so you have to choose between memory expansion and dual-sim.
| Configuration | Slot 1 | Slot 2 | The result |
|---|---|---|---|
| Option A | Nano-SIM | Nano-SIM | 2 numbers are working, no SD |
| Option B | Nano-SIM | MicroSD | 1 number + memory is working |
| Option B | MicroSD | - | Only memory (rarely) |
Some users use adapters that allow you to place a memory card on top of the SIM card, but this method is extremely risky.
Can I use the SIM and SD adapter at the same time?
What to do if your phone doesn’t see your SIM card
When you install the communication module on the screen appears the words "No SIM card" or "Put SIM card" is common, the first thing you need to check the correct installation: contacts should be clean, and the card should sit tight in the tray.
Try to wipe the SIM card contacts with a soft dry cloth or a blower. Fat spots or oxidation can prevent reading data, and it is also worth checking whether the card itself is working in another device to rule out physical malfunction.
If the problem is not solved, you should check the network settings in the software part. → SIM-maps and mobile networks and make sure that the slider activate the desired SIM card is on. 5G/LTE on 3G back and forth.
- 🔄 Reboot: Banal but effective action: Restart your smartphone to update your network registration.
- 📶 Resetting: In the menu of mobile networks, find the reset point to standard values.
- 🛠️ Verification IMEI: Type *#06# into the dialer if IMEI not displayed or equal to zero, there may be a problem with the modem or firmware.
⚠️ Warning: If the smartphone starts to heat up at the bottom after installing the SIM card, immediately remove the tray.This may indicate a short circuit of contacts or a malfunction of the card itself.
Frequent questions and problem-solving
Users are often interested in the safety of retrieving a SIM card on an on-device. Technically, the standard allows for hot extraction, but the system may not have time to correctly complete the recording processes, which could theoretically damage the operator's profile.
Another common question is about cropped SIM cards, if you crop the card yourself and it starts hanging around in the tray, use a small piece of tape or a paper insert to fix it, but it is better to order a new card from the operator, since a dangling chip can damage contacts inside the phone.
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The most common reason for reading errors is a map orientation or contamination of contacts, not a phone breakdown.
In rare cases, the tray may get stuck inside. Don't try to pull it out with tweezers or a knife through the slot. Try tapping your phone slightly with your hand edge against a soft surface (such as a sofa) when you press the extraction mechanism.
For moisture-protected devices, it is important to close the tray tightly before clicking, otherwise the IP68 or IP53 water protection will stop working.