How to insert it correctly SIM-map 4A: photo-instruction

Xiaomi Redmi 4A — One of the brand’s most popular budget smartphones, launched in 2016, but still in use today for its reliability and simplicity, but even a device as simple as this can have questions about basic setup, especially if you’re first to encounter the Xiaomi brand. The main thing is how to insert correctly SIM-card to avoid damaging the tray and ensure stable network operation.

In this article, we will not only explore the mechanical installation process, but also the nuances that are often overlooked in standard instructions, from the difference between nano-SIM and micro-SIM to why a smartphone may not see the network after installation. SIM-Memory card in the hybrid slot – the feature that causes the most questions for owners of Redmi 4A.

Preparation: what SIM-The card is needed for Xiaomi Redmi 4A

Before opening the tray, make sure you have the right format. SIM-maps. Xiaomi Redmi. 4A It only supports nano-SIM (format) 4FF, size 12.3×8.8 If you have an old card (mini-SIM or micro-SIM), you have to cut it or replace it in the operator's cabin:

🔹 Bad contact – a smartphone can periodically lose network.
🔹 Slot damage – metal contacts of the card can scratch the connector.
🔹 Overheating of the module - a loose fit violates the heat sink.

If you are planning to use two SIM-Note that the Redmi cards 4A Supports a hybrid slot: either two nano-SIMs or one nano-SIM + microSD (up to 256 GB) insert two at the same time. SIM And you can't have a memory card, it's a hardware limitation, and you have to choose between a second SIM or a memory extension.

📊 What format? SIM-You have cards now?

nano-SIM

micro-SIM

Mini-SIM (standard)

I don't know.

Where is the slot for SIM-maps 4A

Unlike the flagship models of Xiaomi, where the slot can be located on top or side, in Redmi. 4A It's on the left end of the body, and to detect it, flip the phone upwards and look at the left side, and you'll see a little hole with a metal rim. SIM-map.

Don't confuse it with:

🔊 Microphone (located at the bottom next to the charging connector).
📍 Infrared port (top if you have one in your modification).
🔋 Charging indicator (small light bulb next to the USB-port).

If you're not sure you've found the right hole, flash a flashlight - inside should be a groove for the key-clip. On some versions of the Redmi 4A (for example, for the Indian market), the slot may be on the right, but this is extremely rare.

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If you have a phone in your case, remove it before removing the tray - the case can block access to the key or interfere with the extension.

Step-by-step: how to open the tray and insert SIM-map

Now, to the process itself, you're going to need a key to extract it. SIM-tray (company with phone) or replacement - paper clip, unbend stationery button:

Turn off the phone. This is not necessary, but it is recommended to avoid failures when rebooting the communication module.
Put the key in the hole on the end of the phone to the end. Press with a little effort - the tray should jump 1-2 mm.
Carefully stretch the tray with your fingers. Don't pull the key, so you can break the spring mechanism!
Put it down. SIM-map in the appropriate groove (there are hints on the tray: SIM1 and SIM2). Contacts should be directed downwards and the bevelled corner should be directed towards the outer edge of the phone.
Insert the tray back before you click. Make sure it sits flat - skewings can lead to poor contact.

If the tray is not fixed or falls out, check:

🔄 Correct installation SIM-maps (possibly inverted).
🧲 Clean contacts (dust or fat may interfere with fixation).
🔧 Integrity of the spring in the tray (if it is bent, the tray will have to be replaced).

The tray is locked before the click |

SIM-map is downward contact|

The bevelled corner of the map matches the tag on the tray |

The phone does not overheat (if it was turned on during installation)-->

What to do if Xiaomi Redmi 4A see SIM-map

Sometimes after installation, the smartphone stubbornly does not recognize SIM-It can be hardware or software, and it's a simple one to start with:

Reboot the phone. It's banal, but it helps 30 percent of the time.
Check the installation correctly. Remove the tray and make sure the map is flat, without skewing.
Clean the contacts. Clean the metal parts. SIM-cards and slots with dry soft cloth (such as microfiber).Do not use alcohol or wet wipes! - this can oxidize the contacts.
Check the SIM on another phone. If the card is not working there, the problem is with the operator (locked, inactivated) or in the card itself (damaged).
Update the software. Go to Settings → About Phone → System Update and install the latest version of MIUI.

If nothing helps, the problem may be:

Reason.	Signs.	Decision
The slot is damaged.	Phone doesn't see any SIMs, tray hangs around	Replacement of the slot in the service center (~1500–2500 ₽)
IMEI failure	B Settings → The phone is displayed as "unknown" instead of "unknown". IMEI	IMEI Recovery through Engineering Mode (requires root)
Problems with the antenna module	The network only appears in certain places, often terminated.	Diagnostics in the service (it is possible to replace the antenna plume)
The conflict between two SIMs	One SIM works, the other does not (or vice versa)	Change the cards or disable one in the settings

How to check IMEI on Xiaomi Redmi 4A?

Open the Phone app and enter the *#06# combination. If a 15-digit number is displayed as an error or a "Null" IMEI is shot down, this can happen after a failed firmware or mechanical damage to the motherboard, and you can only restore it yourself with a backup or special equipment.

Network settings after installation SIM-map

Even if you saw the smartphone SIM-map, this does not guarantee stable network operation. After the first installation, it is recommended to check and configure the following parameters:

Network mode. Go to Settings. → SIM-maps and mobile networks → [choose SIM] → Network type. Choose for better coverage 4G (preferably, if 4G No catch, try it. 3G or 2G (In the middle of nowhere, sometimes they're the only ones who work).
Access Points (APN) If the internet is not working, check the APN settings. These are usually set automatically, but sometimes manual input is required. You can find the settings for your operator on its official website.
SIM Priority: If you use two cards, in Settings → SIM-cards you can choose which will be the main one for calls, SMS and mobile Internet.
Roaming, turn off the settings. → SIM-map → Roaming data, if you are not abroad, will save battery and prevent unexpected waste.

If the internet doesn’t work after setting up, try:

🔄 Switch flight mode (on for 10 seconds, then turn off).
📶 Manually select the operator in the Settings → Mobile network → Network operators.
🔧 Reset network settings in Settings → System system → Resetting settings → Resetting Wi-Fi, Mobile Network and Bluetooth.

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If the Internet is lost after resetting the network settings, do not panic - sometimes 1-2 reboots are required to apply the parameters.

How do you put two in? SIM-card and memory card simultaneously

Redmi owners 4A Often faced with the dilemma of how to use two SIM-And you can also expand your memory with a microSD, and unfortunately, you can't do that at the same time, because it's a hybrid slot, and you have to choose between the two:

📱 Two. SIM-cards (without memory card).
💾 One SIM + microSD (second microSD) SIM won't work).

If you are critical to both SIMs and additional memory, consider alternatives:

🔄 Cloud storage (Google Drive, Mi Cloud) for photos and documents.
📁 OTG-flash drive (connected via adapter to the USB-port).
📱 Replacement with a separate slot model (e.g. Redmi) 5A or Redmi Note 4X).

If you decide to donate a second SIM to a microSD, consider:

⚠️ Note: ExFAT memory cards may not be supported. format microSD to FAT32 Also avoid cards with a capacity of more than 256 GB. - Redmi 4A Maybe they don't recognize them.

Frequent Mistakes and How to Avoid Them

Even experienced users sometimes make mistakes when working with the Internet. SIM-Here are the most common ones and how to prevent them:

Using the wrong tool to remove the tray, knives, forks or toothpicks can damage the mechanism, use only a special key or an unbended clip.
Installation SIM-This leads to scratches on the contacts and a bad signal. Always check the location of the bevelled corner.
There's a lot of pressure on the tray when you set it up, just a little click, and an excessive force can bend the tray.
Ignoring software updates: Older versions of MIUI may have SIM-recognition bugs. Check for updates regularly.
Wet storage. Condensate can oxidize the slot contacts. If the phone is wet, dry it before installing the SIM.

If you've already made one of these mistakes, don't panic. In most cases, the consequences are reversible:

🔧 Scratches on the contacts can be gently cleaned with a swallow (washing gum).
🔄 A bent tray can sometimes be straightened with pliers (but it is risky - it is better to replace it).
💧 Oxidized contacts are cleaned with alcohol (only after complete drying!).

⚠️ Warning: If after your manipulations the phone stopped turning on or the slot completely failed, do not try to fix it yourself.

FAQ: Answers to Frequent Questions

Can I insert a micro-SIM into Redmi 4A without an adapter?

No, Redmi 4A only supports nano-SIM. Micro-SIM won't physically fit in a slot without cropping, which is highly discouraged. Contact the operator for a nano-format replacement card - it's free.

Why does the phone see why? SIM-map, but not netting?

There are several reasons: 📵 Failure in network settings – try resetting them to Settings → System system → Resetting settings → Resetting network settings. 📡 Problems with the operator – check whether technical work is carried out on the website of your provider. 🔋 Battery savings – in battery settings, background mode may be limited for SIM-map. 🛠️ Damage to the antenna module – if the network is lost even from another SIM, go to the service.

What is the maximum memory card size of Redmi 4A?

Officially, up to 256GB. However, in practice, some 512GB cards work too, but there may be formatting issues (FAT32 is recommended). Read/write speed depends on the card class: 1080p video recording requires a class of 10 (UHS-I).

Can I use a tray from another Xiaomi phone?

Theoretically, yes, but only if the model is identical in size and type of slot. 5A It's fine, but Mi. A1 — No, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no, no. No, no. No, no. No, no. No, no. No, no. No, no. No, no. No, no. No. No, no. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. No. 4A (It costs about 200-300. ₽).

What to do if the tray is stuck and not moved?

Don't try to pull it out by force! Try first: Push the tray on the back (for example, through the speaker hole) with a thin object. Use a thicker paper clip or key - sometimes the standard tool is too thin. Tilt the phone at a 45° angle and shake slightly - the tray can move under gravity. If nothing helps, contact the service - self-attempts can damage the mechanism permanently.