A mobile phone without an active SIM card is turning into a limited multimedia player, deprived of access to voice and mobile Internet. Owners of the popular Xiaomi Redmi Note 4X model, released in 2017, often face the need to replace the carrier or first activate the device after purchase. Despite the fact that the procedure seems trivial, the wrong actions can damage the contact group or the tray itself, so it is important to be careful.
Modern smartphones use compact media formats, and the Redmi Note 4X is no exception, requiring the use of a Nano-SIM standard card. The design of the tray in this model has its own features that differ from older or, conversely, newer versions of Xiaomi devices. Understanding these nuances will help you avoid situations where the card is inserted on the wrong side or stuck inside the case.
In this article, we will take a look at the tool preparation process, determine the type of tray you have, and Step-by-step describe the installation procedure. You will learn how to properly orient the chip so as not to damage it, and what to do if the phone does not see the network after installation. The main feature of the Redmi Note 4X tray is its hybrid design, where the second slot can accept either a second SIM card or a microSD card, but not simultaneously.
Tools and workplace preparation
Before any manipulation with technical holes of the smartphone, it is necessary to provide good lighting and a clean surface. Dust, villi or small debris that get inside the case along with the SIM card can oxidize contacts and disrupt the connection with the motherboard. It is recommended to wipe the workplace with dry soft cloth to exclude static electricity.
To extract the tray, you'll need a special paper clip that comes with the device. If the original key is lost, you can use a thin needle or a stationery clip by straightening out one of its ends. 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.
Make sure your hands are dry and clean, as greasy marks can remain on the golden contacts of the SIM card. Also check the integrity of the plastic card itself: it should not have cracks, chips or severe scratches in the chip area. If the card is too large and carved by hand, make sure that its dimensions are exactly the Nano-SIM standard, otherwise it may get stuck.
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Use only metal tools to extract the tray, as plastic toothpicks can break inside the hole and block the mechanism.
Definition of the tray type and its extraction
The Redmi Note 4X has a tray on the top of the case, and depending on the regional version (Chinese, global or Indian), the design of the tray may vary slightly. In some versions, the first slot is exclusively for the SIM card and the second is a hybrid, while in others, both slots can support SIM cards, but with limited memory usage.
To extract the tray, find a small circular hole on the upper end next to a long narrow strip, insert the tool perpendicular to the surface of the shell into this hole, and you need to exert a confident but not excessive force to make the latch mechanism work and the tray extend a few millimeters.
Once the tray has appeared from the body, gently tuck it with a nail or tweezers and remove it completely. Pay attention to the shape of the cutouts: they have rounded corners on one side, which prevents improper installation. The tray usually has micro holes or an engraving indicating which slot is the main and which is an additional one.
SIM card orientation: how not to confuse the parties
The most critical thing is that the map is correctly aligned with the tray contacts. The Nano-SIM standard has a chip that occupies most of the surface of the plastic substrate, but it's asymmetrically positioned. One of the corners of the map is cut off, and it's that slice that should match the corresponding bevel in the tray's pad.
When installing a card in Redmi Note 4X If you flip the map upwards, the phone can't read the data, and in the worst case, you can damage the reader. Visually compare the contact pattern on the map to the diagram drawn on the tray itself.
A hybrid slot (usually the second) requires special care. If you plan to use two SIM cards, you can’t install a microSD card. If you only need one SIM card, you can install it in any of the slots, but for maximum compatibility with 4G networks, you better use the first slot, which is often marked as SIM 1.
- 📐 The cut corner of the card should always coincide with the bevel in the tray - this is the main physical key.
- 🔌 Golden contacts are headed down, to the smartphone board, not up.
- 🚫 Don’t try to push the card by force unless it comes in easily – check the orientation again.
Step-by-step installation instructions
The installation process requires a consistent execution of actions to ensure the reliability of the connection. First, take the tray in your hands so that you can see the inside of it. Carefully place the SIM card in the appropriate recess of the first slot, making sure that it fits tightly to the bottom and does not stagger.
If you use a second SIM card, place it in the second slot, observing the same orientation by contacts. Make sure that the cards do not run into each other and do not protrude beyond the plastic frame of the tray. Any exposure can lead to jamming of the mechanism when the tray returns to the case.
Insert the tray back into the phone, observing the right side. The tray enters only in one position; if you feel resistance, do not push, but flip it over with the other side. Smoothly push the tray until a characteristic click that signals that the latch has fixed the mechanism.
☑️ Installation checklist
Once installed, turn on the device. The screen should light up, and in a few seconds, the signal level and operator name indicators will appear at the top of the display. If there are no icons, the map may be installed incorrectly or damaged.
Network setup and operation check
After the physical installation of the Redmi Note 4X It will automatically try to determine the network parameters of the new operator, and in most cases the process takes place without the user's input, but sometimes manual settings are required. APN to access the mobile Internet. You can check the status of the connection in the Settings section → The phone. → Background.
If the phone offers to update network settings or requests PIN-For dual-symbol models, it is important to set the priority of calls and mobile traffic, since by default the Internet can only work on one of the cards.
If the network doesn't show up, try rebooting the device. Sometimes it takes time for the system to register on a new network, especially if you're in an uncertain reception zone or have changed region, and check if there's a flight mode that locks all wireless connections.
What to do if your phone says “No SIM card”?
Common mistakes and ways to solve them
One of the most common mistakes is to install a card with contaminated contacts. Fat spots or oxidation can interrupt contact, causing the phone to periodically lose network.
Another problem is the use of cropped cards. If a SIM card was cut out of Micro or Standard format manually, its size may not match the tolerance of the Redmi Note 4X tray. Too small a card can hang around and not reach the contacts, and too large a card can get stuck. In such cases, it is better to contact the communication salon to replace the card with a factory Nano format.
Some users try to put the tray upside down, and the mechanism of the phone is designed in such a way that it is physically difficult, but if you press hard, you can damage the inner pins. If the tray does not enter smoothly and effortlessly until the very end, immediately stop the pressure and check the orientation.
| Problem. | Possible cause | Decision |
|---|---|---|
| Phone can't see the network | Improper orientation of the map | Turn the map down with contacts |
| The tray is stuck | Trying to put the tray upside down | Carefully remove and flip the right side |
| No Internet. | Wrong APN settings | Enter operator settings manually or reset them |
| No map is fixed. | Size mismatch (cut card) | Replace the SIM card with the original Nano-SIM |
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Proper installation of the SIM card is not only a matter of communication, but also a guarantee of the longevity of the reading mechanism of your smartphone.