Xiaomi Redmi 9 is still a popular choice due to its balance of price and functionality, but even simple operations like installation are not a good choice. SIM-The cards may raise questions for the beginner, especially if you're talking about a hybrid slot that supports either two nano-SIMs or one. SIM + microSD card. In this article, we will discuss all installation methods, including nuances for different versions of the device (for example, Redmi). 9A or Redmi 9C different location of the slot, and also tell how to avoid typical errors when activating the mobile network.
Many users face problems after installation: the phone does not see SIM-A card, not catching the network, or issuing a "No Service" error, most often due to improper card trimming, contact contamination, or incorrect settings. APN. We will analyze each situation in detail and give a checklist for diagnosis.
If you’ve just purchased a Xiaomi Redmi 9 or are considering a change of operator, this guide will save you time and avoid going to the service center. And for those who like visual cues, at the end of the article there’s a video guide and a comparison table of types. SIM-map.
Preparation: which SIM-The card is suitable for Xiaomi Redmi 9
Xiaomi Redmi 9 supports only nano-SIM (4FF format, size 12.3×8.8 mm). If you have a card of another standard (mini-SIM or micro-SIM), it will have to be cropped or replaced in the cabin of the operator.
- 📱 Two nano-SIMs (for two numbers at the same time)
- 📱 + 💾 One nano-SIM + microSD (up to 512 GB)
Important: If you choose the option with a memory card, the second one is SIM-The card won't work. It's a limitation of the slot architecture.
How do you check the current SIM format? Look at the plastic holder:
- 🔹 If the card is inserted into the holder without an adapter, it is a nano-SIM.
- 🔹 If you need a plastic frame, it is a micro-SIM (trimming is needed).
- 🔹 If a card is the size of a bank card, it is a mini-SIM (trimming is required).
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Attention! Do not use artisanal methods of pruning (scissors or knife) - this can damage the chip. It is better to use a special stack for pruning SIM (costs ~ 100 rubles) or contact the operator (free when changing the tariff).
2 Where is the slot for SIM-maps in Redmi 9
Xiaomi Redmi 9 tray for the first time SIM-The card is located on the left end of the device (if you look at the screen), it is easy to recognize by the small hole for the tool from the kit.
🔍 Differences in other models of the series:
- 📱 Redmi 9A/9C: slot on the right end (near the power button).
- 📱 Redmi 9T/9 Power: Slot on the left end, but with an additional rubber pad to protect against moisture (IP53).
In the Redmi 9 Pro, the slot is combined but supports 5G format – if your SIM doesn’t support new networks, the network may not work well.
🛠️ What will be needed for installation:
- 🔧 Paperclip or tool for extracting the tray (goes with the phone).
- 📱 Nano-SIM (or trimmed micro-SIM).
- 🧴 Dry wipe (to clean contacts if necessary).
3. Step-by-step instruction: how to insert SIM-map
Follow this algorithm to avoid damage to the tray or contacts:
- Turn off your phone. This is not necessary, but it is recommended to avoid failures when initializing the card.
- Take a paper clip (or tool from the kit) and gently insert it into the hole on the end of the phone. Press until you click, the tray will extend 2-3 mm.
- Take out the tray completely. Pay attention to the slots for SIM-map: 📱 Slot 1 (closer to the edge of the tray) - the main SIM (supportive 4G). 📱 Slot 2 - second SIM microSD.
chip down
flattened
Turn on your phone and wait for the network icon to appear (usually it takes 10–30 seconds).
The tray is clean, without dust and moisture|SIM-The card is cropped correctly (nano-SIM)|Removal tool at hand|Phone off (recommended)|Settings checked APN operator-->
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If the tray is not inserted to the end, do not apply force - check if the position is correct. SIM-Forced pressure can bend the contacts inside the phone, leading to expensive repairs.
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If the tray is stuck and not retractable, try to heat the phone slightly with a hairdryer (no more than 40 ° C) - sometimes this helps with the deformation of the plastic.
Possible problems and their solution
After installation SIM-The phone doesn’t see the card, check the following points:
| Problem. | Possible cause | Decision |
|---|---|---|
| The phone can't see. SIM-map | The card is inserted with a chip up or not until the end | Turn the map over and check the tray installation density |
| No network or "Emergency Calls Only" | Incorrect APN or SIM settings are not activated | Check it out. APN In Settings → SIM-maps and mobile networks → Access point (APN) |
| SIM-The map is determined, but there is no Internet | Mobile traffic is disabled or the limit is exhausted | Enable data transfer in the notification curtain or check the balance |
| The tray doesn't fit back in. | SIM-card protrudes over edges or tray deformed | Check the evenness of the card trimming or contact the service |
🔧 Additional steps in case of error "SIM-card not supported":
- 🔄 Reboot the phone.
- 📶 Check if yours is supported. SIM 4G/LTE (Older cards may not work on new networks).
- 🔧 Update the phone software: Settings → The phone. → Updating the system.
- 📞 Contact the operator to check the activation of the card (sometimes you need to re-register on the network).
What to do if the slot is physically damaged?
5. Network setup after installation SIM-map
After successful installation SIM-You may need to adjust your card, especially if you use two. SIM-cards or transfers from another operator.
📶 How to choose the main one SIM for calls and the Internet:
- Go to Settings. → SIM-maps and mobile networks.
- Select the item Name SIM-Cards and labels (e.g., "Worker" and "Personal").
- In the Mobile Traffic section, specify which SIM will be used for the Internet.
- In Call Settings, select the default SIM for outbounds.
⚡ Setting up APN (manual access points:
If the Internet is not working, you may not have automatically set up.
- Go to Settings. → SIM-maps and mobile networks → Access point (APN).
- Click Add APN and enter your carrier’s details (see table below).
- Save and restart the phone.
| Operator. | APN name | APN | Type of authentication |
|---|---|---|---|
| MTS | mts | internet.mts.ru | PAP |
| Beeline | beeline internet | internet.beeline.ru | PAP |
| MegaFon | Megafon | internet | PAP |
| Tele2. | tele2 internet | internet.tele2.ru | PAP |
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If the Internet does not work after manually setting up the APN, check whether the option "Data Transfer" is enabled in the notification curtain and whether the "On the plane" mode is active.
Frequent questions about SIM-Maps in Xiaomi Redmi 9
🤔 Can we use two? SIM-card and memory card simultaneously?
Xiaomi Redmi 9 has a hybrid slot: either two SIM-card SIM + If you need both two numbers and additional storage, consider cloud storage (e.g. Mi Cloud or Google Drive).
🤔 Does Redmi support the eSIM 9?
No, Redmi. 9 (including modifications 9A/9C/9T) It does not support eSIM technology. Two numbers will require a physical second number. SIM-map.
🤔 What to do if the phone asks for PUK-code?
That means that SIM-The card is blocked after three incorrect attempts to enter PIN. PUK-The code is on the plastic holder that came with the card. If it is not, contact the operator (a call is possible even with a blocked card). SIM emergency number).
🤔 How to transfer contacts with the old SIM Redmi 9?
Ways:
- 📱 Use the Contact Application: Import/Export → Import with SIM-map.
- ☁️ Sync your contacts with your Google account or Mi Account.
- 📧 Export contacts to a.vcf file and send them to a new phone.
🤔 Why is the second SIM-card-less 4G?
In Redmi 9, only the first slot (SIM 1) supports 4G/LTE. The second SIM works in 3G/2G mode. To change priority, move the cards in places.
7. Video instructions and additional materials
If you find it easier to perceive information visually, watch the official video from Xiaomi on installation SIM-maps in Redmi 9:
🎥 Link to the video (YouTube) - step-by-step analysis with a demonstration of the tray and the correct position of the map.
📚 Useful references:
- 🔗 Xiaomi Official Support – Instructions for All Models.
- 🔗 Forum 4PDA — debate SIM Redmi 9.
- 🔗 Technical specifications for GSM Arena.
📌 Travellers’ advice: If you change frequently SIM-cards (for example, in roaming), use an adapter for a tray with magnetic mounting - this will speed up the replacement process.
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Before traveling abroad, check to see if your Redmi 9 is unlocked to work with local operators.Some models bought from official dealers may be region-specific.