Installing a SIM card in a Xiaomi Redmi smartphone is a seemingly simple procedure, but even it can raise questions for a beginner, especially if it is a hybrid tray, nano-SIM or two SIMs at the same time. In this article, we will examine all the nuances from choosing the right tool to activating the mobile network, including typical errors that lead to a lack of signal.
It is important to understand that the process may vary depending on the Redmi model. For example, the Redmi Note 12 uses a hybrid tray for two nano-SIMs or one SIM + microSD, and the Redmi A2 uses only two nano-SIMs without memory card support. We will look at the universal steps that will suit most devices in the series, and also point out the features of specific models.
If you've never inserted a SIM card yourself or are afraid of damaging the slot, this guide will help you avoid common problems, from having no network after installation to getting stuck in the tray, we'll tell you how to proceed in each situation.
What SIM cards are suitable for Xiaomi Redmi
All modern Xiaomi Redmi smartphones (starting in 2018) support only nano-SIM (4FF) format, which means that if you have an old micro-SIM or a full-size SIM, it will have to be trimmed or replaced in the cabin of the operator. Using adapters or hand-cut cards can lead to loss of contact between the SIM and the reader, which will cause network problems.
It is important to check compatibility not only by size but also by supported communication standards. Most Redmi models run on networks:
- 📶 2G (GSM 900/1800 MHz) for voice communications;
- 📶 3G (UMTS 900/2100 MHz) - for mobile Internet;
- 📶 4G/LTE (Band 1/3/5/7/8/20/28/38/40/41) — high-speed;
- 📶 5G (In the Redmi Note 11 Pro models+ 5G, Redmi K50 newer).
To find out what ranges your model supports, check the specifications on the official Xiaomi website or in the documentation. For example, the Redmi 10C does not support 5G, but has improved 4G reception compared to older models.
⚠️ Note: If you use a SIM card older than 5 years, its chip may be worn out, in which case even the correct installation does not guarantee a stable signal.
Types of sim trays in Xiaomi Redmi: how to determine your own
Xiaomi Redmi smartphones are equipped with three types of trays for SIM cards:
| Type of tray | Models. | What's up | Features |
|---|---|---|---|
| Normal (2 nano-SIM) | Redmi 9A, Redmi A1, Redmi Note 10 | Two nano-SIM + microSD (Separate Slot) | The most convenient option is not to choose between the second SIM card and memory card. |
| Hybrid (SIM + SIM/microSD) | Redmi Note 11, Redmi 10, Redmi K40 | Two nano-SIMs or one SIM + microSD | When using two sims, you can not insert a memory card, and vice versa. |
| SIM only (without microSD) | Redmi K60, Redmi Note 12 Pro+ | Two nano-SIMs | There is no memory card support, just built-in storage. |
To find out the type of tray in your model, check:
- Documentation in the box of the smartphone (section "Specifications").
- The official site of Xiaomi - in the characteristics of the device.
- Visually inspect the tray: if it has an SD tag, it means that microSD is supported.
Preparation for installation: tools and precautions
Before you start installing a SIM card, prepare everything you need:
- 🔧 Paperclip or key to extract the tray (goes complete with the phone).
- 📱 Nano-SIM (if the card is different size, cut it or get a new one from the operator).
- 🔍 Good lighting - the tray is small, easy to drop the sim.
- 🧲 Magnetic surface (in case you drop a paper clip or SIM).
If you don’t have a Xiaomi brand key, you can use:
- 📎 Folded paper clip;
- 🔑 A needle or a thin pin (carefully so as not to damage the hole);
- 📱 Clamp for SIM cards from another smartphone.
⚠️ Warning: Never use sharp objects (knives, scissors) to remove the tray.This can damage the fixation mechanism or scratch the body of the smartphone.
💡
If the paperclip does not enter the tray hole, try to slightly heat it with a lighter (without leading to redness) - the metal will become softer and easier to enter.
Step-by-step: how to insert a SIM card in Xiaomi Redmi
Follow this algorithm to correctly install the SIM card:
- Turn off your smartphone. Although many people install a SIM on the phone that's on, it's best to turn it off to avoid modem malfunctions.
- Find a SIM card tray. Most Redmi models have it on the left side of the screen, and some devices (like Redmi 9T) have it on the top end.
- Remove the tray. Put the paper clip in a small hole next to the slot and press until you click. The tray will move out automatically - don't pull it by force!
- Place the SIM card in the tray. The Nano-SIM should lie chip down, and the beveled corner of the card matches the beveled corner of the tray. If you have a hybrid slot, choose a side for SIM (usually marked 📱).
- Put the tray back in. Squeeze it right up to the end, and it's going to be a little click. Don't use too much force.
- Turn on your phone and check the network. Once the system is loaded, the network indicator should appear in the status bar (📶). If it is not, restart the device.
The tray is inserted to the point and does not stagger |
SIM card is chip down |
The sloping corners of the sim and tray match |
There is no dust or foreign objects in the tray-->
If the SIM is not determined after installation, try:
- 🔄 Reboot the phone;
- 📱 Remove and re-insert the tray;
- 🔧 Check if the slot is contaminated (dust or contact oxidation may interfere with the connection).
Frequent Mistakes and How to Avoid Them
Even with the seemingly simple procedure, users often encounter problems, and here are the most common mistakes and solutions:
| Problem. | Reason. | Decision |
|---|---|---|
| Symbol is undetermined | Incorrect installation (chip up) or contamination of contacts | Turn the SIM over, wipe the contacts with alcohol |
| The tray is not fixed. | Simka set curved or tray deformed | Check the flatness of the installation, if necessary, replace the tray. |
| No network after installation | Non-activated SIM or failure in network settings | Call the operator back for activation or reset the network settings in Settings → SIM-maps and mobile networks → Reset |
| The phone doesn't see the second SIM | Hybrid tray: second SIM conflict with microSD | Make sure that the tray only SIMs (without a memory card) |
One of the most insidious problems is the oxidation of the contacts in the slot. If the SIM has previously worked but suddenly stopped being detected, check the metal contacts in the tray: they should shine. If there is a green or black coating, wipe them with a cotton swab dipped in alcohol.
What to do if the tray is stuck?
Network settings after installing the SIM card
Successful installation of a SIM card is only half the battle, and in order for the phone to work properly with the mobile network, you need to configure several parameters:
- Select the network operator. Go to Settings → SIM-maps and mobile networks → Select the network and select the mode Automatically or manually specify your operator.
- Setting up access points (APN). If the mobile internet is not working, check it out. APN: Settings → SIM-maps and mobile networks → Access points (APN). The parameters can be requested from the operator or found on its website.
- Network priority. For better Internet speed, set Settings → SIM-maps and mobile networks → Preferred type of network → 4G (or 5G, if maintained).
- Roaming (if necessary) If you are abroad, turn on roaming: Settings → SIM-maps and mobile networks → roaming.
If the internet still doesn’t work after setting up, try:
- 🔄 Reboot the phone;
- 📱 Temporarily disable and re-enable the aircraft mode;
- 🔧 Reset network settings to factory (Settings) → System system → Reset → Resetting network settings).
💡
If after all the manipulations the network does not appear, the problem may be in the SIM card (for example, blocked by the operator) or in the hardware malfunction of the phone (damaged modem).
Features of installing a SIM card in popular Xiaomi Redmi models
Some Xiaomi Redmi models have unique nuances when installing SIM cards.
Redmi Note 11 / Note 11 Pro
These models are equipped with a hybrid tray. If you use two SIMs, the memory card is not supported. Also, the Note 11 Pro has 5G support, but only on the first SIM card (SIM1 slot).
Redmi 10 / Redmi 10A
So here, the tray is on the top end, which is unusual for a series, and you have to be careful when you take it out, if you press the paperclip at the wrong angle, you can damage the power button that's right next to you.
Redmi K50 / K60
Flagship models do not support memory cards, but have an improved modem for stable 5G reception. When installing the SIM, make sure that it supports VoLTE (voice over 4G), otherwise calls will switch to 2G/3G.
Redmi 9A / 9C
Budget models with a separate microSD slot. You can use two SIMs and a memory card at the same time, but the microSD read speed leaves much to be desired (especially when recording video).