How to insert a SIM card in Xiaomi Redmi 4A: instructions with photos and nuances

Xiaomi Redmi 4A — One of the brand's most popular budget smartphones, released in 2016, but still in demand due to its reliability and simplicity. SIM-maps: where the slot is, how to open it without damage, and why the phone can't see the network after insertion. In this article, we'll look at the process from A to Z, from map preparation to diagnosis of possible problems.

The Redmi 4A features two nano-SIMs or one nano-SIM+ microSD card, which means that you can’t expand your memory using two sims, and we’ll tell you how to avoid configuration errors and what to do if your smartphone doesn’t recognize the operator.

The instructions are suitable for both the original version of Redmi 4A (codenamed rolex) and its modifications (e.g. Redmi 4A Prime), all steps illustrated with photos and accompanied by tips from service engineers.

Preparation for installation: what will be needed

Before we start the insertion SIM-maps, make sure you have everything you need:

• 📱 Smartphone Xiaomi Redmi 4A (switched off!).
• 🪨 Paperclip or special key to extract the tray (comprised with the phone).
• 📇 Nano-SIM card (or micro-SIM, cropped to nano-format).
• 🔍 Flashlight (if lighting is weak – the hole for the paper clip may be poorly visible).
• 🧴 Alcohol wipes (optional, for cleaning contacts simki).

If you don't already have a nano-SIM, you can order it from the operator (free or for a nominal fee), or you can cut it yourself with a clipping template. But beware: improper cropping can damage the card chip.

Important: Redmi 4A It doesn't support eSIM, so virtual SIMs won't work here. SIM-Card activated by the operator – sometimes new cards require prior registration through the USSD-command (e.g. *111# for MTS).

Where is the SIM card slot in Redmi 4A

Unlike many modern smartphones, where the slot is located on the side, in Redmi 4A it is on the left side of the device (if you look at the screen). To detect it, flip the phone with the screen to your left end and look at the left end - there you will see a small hole with a metal rim.

Don't confuse it with a microphone hole (at the bottom) or a speaker (at the top).

If you can't find the hole, try swiping your finger on the left side, and you'll feel a little groove, which in rare cases can be covered with a protective film (if the phone is new) that needs to be carefully removed.

⚠️ Note: Do not confuse the slot for SIM It's a headphone jack (3.5 mm), which is located at the top of the phone, and trying to insert a paper clip there can damage the audio jack!

Step-by-step: how to insert a sim

Now, to the process itself, follow the instructions strictly by the steps to avoid damage to the tray or contacts:

1. Turn off your phone. It's a must-have -- hot replacement. SIM-The card may cause a failure in the communication module.
2. Put the paper clip in the hole on the left side, all the way up, and you'll feel a slight click, which means that the tray has unlocked.
3. Remove the tray with a careful movement of your fingers. Don't pull it sharply so as not to damage the guides.
4. Put the nano-SIM in the appropriate slot on the tray, make sure the golden contacts look down and the beveled corner of the card matches the angle on the tray.
5. Insert the tray back before the click. It should enter without effort — if you feel resistance, check the correct installation of the SIM.
6. Turn on your phone and wait for the network signal to appear (usually takes 10–30 seconds).

The tray is inserted to the point and does not stagger |

SIM-card doesn't stand outside the edge of the tray|

SIMKA contacts are clean (no dust or oxidation)|

The phone is completely off before installation-->

If after turning on the smartphone does not see the network, try to restart it or check if activated SIM-You sometimes need to manually select the network in the settings: go to Settings → SIM-maps and mobile networks → Selecting a network and running a search manually.

Frequent Mistakes and How to Avoid Them

Even experienced users sometimes make mistakes when installing SIM-Here are the most common ones and the ways to solve them:

Critical error: If after installing the SIM phone stopped turning on or got stuck on the Xiaomi logo, this may indicate damage to the contacts of the communication module. In this case, do not try to re-extract the tray - contact the service center.

⚠️ Note: If you are using a hybrid slot (SIM + microSD, make sure the memory card is inserted in the correct slot. If you confuse them, you risk damaging both devices!

How to check if the phone recognizes the SIM

After installation SIM-You need to make sure that the phone sees it. Here's how to do it:

1. Turn on Redmi 4A and wait for the system to boot.
2. Pull the notification curtain down – the network indicator (operator name or antenna icon) should be displayed at the top of the screen.
3. If there is no indicator, go to Settings → The phone. → Status SIM-This should show the phone number, IMEI and network status.
4. Try making an outgoing call (e.g., 112) or sending an SMS.

If the phone does not recognize the SIM, but you are sure that it is working, try the following steps:

• 🔄 Reboot the phone.
• 📶 Manually select the network in the settings (Settings) → SIM-maps and mobile networks → Choice of network).
• 🧹 Clean the contacts of the SIM and tray with an alcohol napkin.
• 🔧 Reset network settings: Settings → System system → Reset → Resetting network settings.

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If the phone sees a SIM but there is no internet, check the APN settings. These are usually set automatically, but sometimes manual input is required. The APN settings for your carrier can be found on its official website.

What to do if the SIM slot is damaged

Tray for SIM-maps 4A — One of the most vulnerable areas, the most common ones that users face are the following:

• 🔧 Tray jamming – usually due to dust ingress or deformation of metal guides.
• 💥 Breaking the paper clip inside the hole – if the tool was too thin or brittle.
• 📶 Lack of contact – oxidation or contamination of contacts on the tray or simk.

If the tray is jammed, do not put too much effort - this can lead to a break in the plume.

1. Use a thicker paperclip or needle to gently push the tray through.
2. Apply a drop of silicone lubricant (such as WD-40) into the slots of the tray and wait 5-10 minutes.
3. If the tray fell out of the slots, try inserting it back, slightly pressing on the top (from the screen side).

In case of serious damage (for example, broken contacts or a crack on the tray), a module will need to be replaced. The cost of repairs at the Xiaomi service center is about 800-1,500 rubles (2026), the alternative is to buy a tray on AliExpress (price ~ 300 rubles) and replace it yourself, but this requires dismantling the phone.

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If the phone stopped turning on after mechanical action on the slot, most likely the antenna plume or motherboard is damaged, in which case the repair should be carried out by a specialist!

Alternative ways to activate the SIM without a physical installation

In rare cases (for example, if the slot is damaged) it is possible to activate the slot. SIM-It's a card without physically putting it in your phone:

• 🖥️ Another smartphone or tablet with nano-SIM support.
• 📞 Access to USSD-operator.
• 🌐 Wi-Fi connection (for registration through the operator application).

Algorithm of action:

1. Insert the SIM into another phone and activate it through USSD-command, for example, *111*1# for Beeline).
2. Install your carrier’s app (such as “My MTS” or “Tele2”) and complete the registration.
3. If you need an IMEI binding, use the IMEI of your Redmi 4A (you can find it on the sticker under the battery or in your phone settings).
4. After activation, move the SIM back to Redmi 4A.

This method is suitable if the problem lies in the mechanical part of the slot, not in the software settings of the phone. However, keep in mind that without a physical SIM you will not be able to call or use the mobile Internet - only activate the card for further use.

FAQ: Answers to Frequent Questions