Xiaomi Redmi 4X remains a popular device due to its reliability and availability, but the initial setup of communication can raise questions for beginners. Proper installation of the communication module is the first step to full use of the gadget, and it is important to perform all the actions carefully so as not to damage contacts. In this article, we will discuss in detail the process of installing SIM cards, understand the types of trays and solve possible problems with network definition.
Many users are struggling with the misunderstanding of the design of the slot, which has its own characteristics in this model. Hybrid slot requires careful consideration of the choice between the second SIM card and the memory card. Ignoring the nuances of the installation can lead to the fact that the phone will not see the network or will constantly lose the signal, so follow the instructions carefully.
Before you start physically impacting your device, you need to make sure you understand what card format your device supports. Current communication standards dictate their rules, and using adapters or improperly trimming plastic can cause the reader to break. We'll look at all aspects of preparation and installation to ensure that your Redmi 4X runs smoothly.
Preparation for installation and types of SIM cards
The first thing to do is to determine which SIM card format you use, as it depends on whether you need to trim it or use an adapter. Xiaomi Redmi 4X works with Nano-SIM format, which is the smallest among the common standards at the moment. If your card is the size of a Mini or Micro, it will have to be cut off along the circuit or replaced from the carrier, which is a safer option.
It’s important to understand that the tray in this smartphone is hybrid, meaning it combines space for a second SIM card and a microSD card slot. This means you can’t use two SIM cards and a memory card at the same time — you have to choose between a memory extension and a second number.
Before removing the tray, it is strongly recommended to turn off the smartphone, although modern standards allow you to do so on hot.De-energizing the device ensures that there is no voltage surge in the power supply chain, which in theory can damage the communication controller, especially if the card contacts are oxidized or contaminated.
⚠️ Warning: Never try to insert a SIM card into the tray with a chip up or in the wrong position.Mechanical force in this case will lead to irreversible damage to the contact group inside the smartphone.
You only need the original paperclip that came with the kit, or a thin needle, to work. Using too thick objects like toothpicks or stationery clips can damage the latching mechanism of the tray, after which it will be extremely difficult to remove it without disassembling the case.
Step-by-step instructions for removing the tray
The process of extracting the tray in Redmi 4X is standardized, but requires care. The tray is on the top end of the device, and you can find it by the characteristic hole next to the frame. It is important not to confuse this hole with the hole of the microphone, which is also located on the upper edge, but has a smaller diameter and is located in the center.
Insert the tool into the hole perpendicular to the phone body. You should feel a slight accent, then press with moderate force until a characteristic click. The tray will extend outwards a few millimeters, which will allow you to grab it with your fingers and remove it completely.
- 📱 Find the top end of the smartphone and locate a small hole next to the frame.
- 📌 Use a paper clip or needle to press inside the hole.
- 🔓 Wait for the tray to extend and gently pull it with your fingers.
- 👀 Inspect the tray: one side is designed for Nano-SIM, the other is for Nano-SIM or microSD.
After extraction, carefully examine the tray. One side has a memory card cutout and the other has a SIM card cutout. In some tray revisions, the place under the SIM card can be combined, but in Redmi 4X, the most common classic separation scheme is the one. Make sure that the tray contacts are free of dust or pile.
Proper installation of SIM card in the tray
Installation of the card in the tray requires the orientation of the chip. Golden contacts must look strictly downwards, to the inside of the tray, if you look at it from the outside upwards. The cut corner of the card must coincide with the cut angle of the notch in the tray, which serves as physical protection against improper installation.
If you only use one SIM card, insert it into a slot designated as SIM 1.This slot is usually a priority for using 4G mobile internet, although in MIUI settings priority can be switched programmatically.
If you use a microSD card, it's installed in the second compartment. Note that the memory card has no latch inside the tray and is kept by the tight fit and pressure of the tray lid. It can fall out if you handle it sloppy, so be careful.
☑️ Pre-installing check
Once the cards are placed, gently push the tray back into the case, it should enter smoothly, without excessive force. If you feel resistance, check the orientation of the map - it is likely that it is inserted incorrectly or skewed.
Features of the hybrid slot and memory card
The hybrid slot in Xiaomi Redmi 4X is a compromise solution of engineers, allowing you to choose between communication functionality and memory, the user must decide in advance what is more important for him: a second phone number or additional storage for photos and videos.
| Configuration | Slot 1 | Slot 2 | 4G support |
|---|---|---|---|
| One SIM card. | SIM (Nano) | Empty. | Yes (LTE) |
| Two SIM cards. | SIM 1 (Nano) | SIM 2 (Nano) | Yes (one 4G, second 2G/3G) |
| Sim + Memory card | SIM 1 (Nano) | microSD (up to 128 GB) | Yes (LTE) |
| Only memory. | Empty. | microSD | No. |
Both slots are 4G-enabled, but high data rates will only be available on one active card, and the second card will run on 2G or 3G networks, which is standard behavior for modems of the period.
⚠️ Note: When installing a microSD card, make sure it is formatted in the file system FAT32 or exFAT. File system. NTFS It may not be defined by a system without third-party software.
If you plan to actively shoot high-resolution video, using a Class 10 or UHS-I memory card will become critical.Slow cards can cause delays when recording video or running heavy applications ported to an external drive.
First Enabling and Configuring the Network
After successfully installing the tray and turning on the smartphone, the MIUI system will automatically detect new SIM cards, and a preference setting notification will appear on the screen, where you can choose which card will be used for default calls and which for mobile Internet.
In some cases, automatic setting of APNs (access points) may not occur, especially if you use a virtual carrier or regional brand SIM card, in which case you need to manually prescribe the network access parameters that can be found on your carrier’s website.
To check the status of the connection, lower the notification curtain and make sure that the 4G, 3G or H+ signs appear next to the signal indicator. If only E or G is on, this means that the phone is in a poor coverage area or network settings need to be adjusted.