Modern smartphones of the Xiaomi brand and the sub-brand Redmi have become one of the most popular devices on the market due to the excellent price-performance ratio. MIUI, Initial communication settings can raise questions for users, especially if they are switching from a different form factor. SIM-cards are the first and most important step, without which it is impossible to use the gadget for calls and mobile Internet.
In this article, we will discuss in detail the process of tray extraction, correct positioning of the chip and initial network configuration. It is important to understand that the design of slots in different models may differ, but the general principle remains the same. Modern Redmi models use only nano-SIM format, so using adapters or trying to insert a larger card can lead to a tray getting stuck.
Before you start physical activities, make sure your device is turned off or at least your screen is locked to avoid accidental taps. While many modern smartphones support hot SIM card replacement, it is better to install the system when the power is turned off to correctly determine the network, which ensures that the operating system correctly reads the operator’s data at start.
Tool preparation and tray type determination
The first step is to prepare the workplace and the tools you need. You don't need complex equipment, just the smartphone and the SIM card itself. The Xiaomi device always comes with a special paper clip to extract the tray. If the original paper clip is lost, you can use a regular stationery clip, straightening one of the ends, or a thin needle.
It is critical to determine the type of tray in your model, as the way you install it depends on it. In budget and mid-budget Redmi models, you often find combined slots where one seat is for the SIM and the second one is for either the second SIM or the MicroSD card. In more expensive models, separate, independent slots or hybrid trays can be installed without support for memory cards.
⚠️ Warning: Never use sharp objects, such as sewing pins or a knife, with excessive force.This can damage the latch mechanism inside the case, and it will be impossible to remove the tray without disassembling the phone.
Look at the end of the device. Usually the tray is on the top or bottom. Near the clip hole, there's often a micro-perforation that tells you which side to act on. Make sure your hands are dry and clean so you don't leave any traces of fat on the card contacts or the gold contacts inside the phone.
The process of extracting the tray and positioning the map
After preparation, you can proceed to directly extract the slot. Find a small hole next to the tray at the end of the case. Put the tip of the clip or needle perpendicular to the surface of the device. Press confidently, but without jerks. You should feel a slight click of the spring mechanism, after which the tray will be slightly extended from the body.
Carefully pull the tray with your fingers. Notice its orientation: on one side of the tray, there is often a schematic hint showing how to place the card correctly. If there is no hint, remember the position of the bevelled corner on the tray itself - it should coincide with the bevelled angle on a plastic basis. SIM-map.
Place the card in the appropriate recess. It should be tight and not wobbly. If you use a combined slot, make sure you don't try to insert the memory card and SIM-The card's contacts should be directed down to the motherboard, although some rare Redmi models also have reverse orientation.
☑️ Pre-insertion check
When you put the card in the tray, gently push it back into the case. It's important to keep the direction: the tray should come in smoothly. If you feel resistance, don't push it, most likely the tray is turned over or inserted on the wrong side. A properly installed tray will equal the frame of the case and will not protrude.
Features of installation in different models of Redmi
The Redmi and POCO lineup (which is also part of Xiaomi’s ecosystem) have hundreds of models, and the designs can vary. Older models like the Redmi Note 4 or Redmi 4X have fully retractable trays and cards are inserted into special sleds. Newer series like the Redmi Note 12 or Redmi 13 use more compact and sealed trays.
Below is a table that helps you navigate the types of slots for popular series:
| Device series | Type of tray | Support for microSD support | Location. |
|---|---|---|---|
| Redmi Note (old) | Retractable | Separate slot | Upper end |
| Redmi Note (new) | Hybrid | Instead of the 2nd SIM | Lower end |
| Redmi (basic) | Triple (3 in 1) | There's a place. | Lower end |
| POCO X / F series | Hybrid | No (only 2 SIMs) | Lower end |
Special attention should be paid to models with support for eSIM. In such devices, there can be only one physical slot, and the second SIM card is activated programmatically through the use of the SIM. QR-If your Xiaomi model does not have a second tray, check the specifications on the official website - perhaps the second line is implemented through a virtual SIM card.
What to do if the tray is not removed?
Initial network setting after switching on
After successful physical installation of the card, turn on the smartphone.Android system with shell MIUI or HyperOS will automatically detect a new SIM card, and a request may appear on the screen. PIN-Enter the code provided by the operator (usually 0000 or 1234 if the code has not changed).
You should check the settings of the APN access points. In 95% of cases, modern Xiaomi smartphones automatically load the correct settings of the Internet and MMS from your carrier. However, if the mobile Internet does not work and calls pass, you will need manual settings.
To do this, go to the settings menu: Settings → SIM-maps and mobile networks → Choose. SIM-map → Access points (APN). If the list is empty or the settings are not working, create a new hotspot by entering data that can be found on your mobile operator's website. Usually, just enter the name of the hotspot and the address. APN.
💡
Save a screenshot of the APN settings before resetting your phone, allowing you to quickly restore access to the mobile Internet without searching the carrier’s website.
Solution: the phone does not see the SIM card
When you put the card out of the box, it's quite common. The first reason may be oxidation of the contacts. Rub the golden part of the SIM card with a soft eraser or cloth soaked in alcohol. Also wipe the contacts inside the tray if you have access.
The second common problem is format incompatibility. As mentioned earlier, modern Redmi only works with nano-SIM. If you cut the card yourself with scissors, the chip or insulation could be damaged, in which case you should contact the communication salon for a free replacement with a card of the correct format.
⚠️ Warning: If your phone says "No Service" or "Emergency Calls Only," try manually selecting the operator in your network settings.
It's also worth checking if the SIM card itself is activated. If the card is new and hasn't been activated in the cabin or through the operator's app, the phone will see it as "Unknown" or simply not respond. Call from another number to your mobile phone - if the beeps are coming, then the card is active and the phone settings are a problem.
💡
If the phone does not see the SIM card, in 80% of cases the problem is solved by cleaning contacts or reinstalling the card with the power off.
Setup two SIM cards and priorities
Most users in Russia and CIS use two SIM cards, and MIUI allows you to flexibly customize their work, you can assign one card to the main one for calling and the other for the Internet, or vice versa, which is convenient for separating personal and work contacts or for saving traffic.
To set priorities, go to Settings → SIM-You'll see the call switches and the mobile Internet switches here, and you'll see the SIM card for each action. Also available here is the function "Smart Switch", which allows you to use the Internet of the second card, if the main signal is missing (the function can be paid by the operator).
It is important to note that in dual SIM mode, mobile internet speeds can be lower than when using a single card, since the antenna is in standby mode of two networks at the same time. If you need a top speed of 4G/5G, temporarily disable the second SIM card in the settings.