Xiaomi Redmi 8 is still a popular choice due to its price and functionality balance, but new owners often have questions about the basic setup. SIM-The maps, and here users are waiting for nuances: hybrid slot, support for two SIM cards and nuances with nano-SIM. Unlike flagships, where the process is intuitive, budget models Redmi sometimes require a more careful approach.
Many people mistakenly think that it is enough to simply insert a SIM and the network will work automatically. In practice, you have to consider the size of the card (only nano-SIM), the correct position in the slot, as well as the network priority settings if you use two SIM cards. In addition, Redmi 8 has a hybrid slot, which means choosing between a second SIM card or a microSD card, a point that is often overlooked. Next, we will examine the entire process from A to Z, including preparing, installing and activating the network, and consider typical errors and their solutions.
If you have just purchased a Xiaomi Redmi 8 or are planning to change your SIM card, this guide will help avoid common problems. We will not limit ourselves to dry steps, explaining why it is important to follow the sequence, how to check the compatibility of the card and what to do if the network does not appear after installation.
Preparation: What to Know Before Installing a SIM Card
Before you start a physical installation, make sure your SIM card meets Redmi’s requirements. 8. This smartphone supports only nano-SIM (format) 12.3 × 8.8 If you have a different size card (micro-SIM or standard card). SIM), It's going to have to be cut or replaced in the operator's cabin, and the use of adapters or homemade croppings can cause damage to the slot or poor contact.
Another key point is the hybrid slot, which in Redmi 8 is combined with a microSD card connector, which means you can use:
- 📱 Two nano-SIMs (without memory card)
- 📱 One nano-SIM + microSD (up to 512 GB)
It depends on your priorities. If you're critically interested in expanding memory, you'll have to sacrifice a second SIM card. Note that if you use two SIM cards, the microSD slot will be physically locked, and you won't be able to insert the card.
Also check if your SIM card is activated from the operator, if the card is new, it may need to be registered through the company's website or office, otherwise the smartphone will not be able to connect to the network even if installed correctly.
Where is the SIM card slot in Redmi 8?
In Xiaomi Redmi 8, the SIM card tray is located on the left side of the device (if you look at the screen), it is easy to identify by the small hole for the tool from the kit. Do not confuse it with the headphone jack (3.5 mm) or microphone, which are on the upper and lower borders, respectively.
To remove the tray, you'll need a paper clip or a special key (complete with your phone) If the key is lost, any thin metal wire or straight clip will do. Don't use sharp objects (needles, pins) so as not to damage the locking mechanism.
The exterior of the tray is a small metal plate with slots for SIM cards, which is usually marked with a diagram showing the correct position of the cards. In Redmi 8, the tray is designed to:
- 🔹 First SIM card (nano-SIM) – top slot
- 🔹 Second SIM card or microSD – lower slot (hybrid)
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If the tray is jammed and does not come out, do not make excessive efforts. Try to heat the case slightly with a hairdryer (not higher than 50 ° C) - sometimes this helps with the deformation of the plastic.
Step-by-step: how to insert a SIM card in Redmi 8
Now, to the process itself, follow the instructions carefully to avoid damaging the contacts or tray.
- Turn off your smartphone. This is not necessary, but it is recommended to avoid possible failures when initializing the SIM card.Push and hold the power button, then select Turn off.
- Put a paper clip or key into the hole on the left side and press until you click. The tray should extend 2 to 3 mm - now it can be carefully pulled out with your fingers. Don't pull too sharply so as not to break the guides.
- Place the tray on a flat surface and place the SIM card(s) according to the markup: 📌 Nano-SIM №1 - contacts down, cut corner to upper left corner of tray. 📌 Nano-SIM №2 or microSD – with contacts down, cut by an angle to the lower right corner.
If you install a microSD, make sure it doesn’t exceed 512GB – Redmi 8 doesn’t support more.
Carefully insert the tray back into the smartphone before the click. Make sure it sits smoothly, without skewing. If the tray is not fixed, check if the cards are correctly installed.
Turn on your phone and wait for the network to be initialized, and the signal level indicators and the name of the operator should appear on the top panel.
☑️ Check before turning on the phone
If the network does not appear after turning on, restart the device or check the settings in the Settings section. → SIM-maps and mobile networks, sometimes requiring manual operator selection.
Frequent Mistakes and How to Avoid Them
Even with the seemingly simple process, users often make mistakes that lead to a network being lost or a phone being damaged, and consider the most common of them:
| Mistake. | Effects of consequences | Decision |
|---|---|---|
| Installation of a micro-SIM or standard SIM | SIM card not fixed, contact damage | Cut to nano-SIM or replace in the cabin operator |
| Slots are mixed up (SIM instead of microSD) | The second SIM card is not working or the microSD is not readable. | Reinstall the cards according to the marking on the tray |
| SIM card set up by contacts up | No network, possible scratches on contacts | Turn over the SIM card and restart the phone |
| Use of an adapter for nano-SIM | Poor contact, loss of network | Use the original nano-SIM without adapters |
In Redmi 8, the contacts should be directed downwards, and the cut corner should be directed to the upper left corner of the tray for the first SIM card and the lower right for the second, if you confuse it, the phone will either not see the card or damage its contacts when the tray is fixed.
Another common problem is contact contamination, where if the SIM card was previously used in another device, it may leave oxides or dust on its contacts, and wipe them with a soft dry cloth before installation.
What to do if the tray is not fixed?
Network settings after installing the SIM card
Successful SIM installation is only half the battle, and it may require additional setup to get the phone online, and once you turn on Redmi 8, it will automatically detect the operator, but in some cases you will have to intervene manually.
Go to Settings. → SIM-maps and mobile networks:
- 🔄 Turn on/off SIM card (useful if you use two cards and want to save charge).
- 📶 Select the network manually (if the automatic search does not work).
- 🔒 Set up PIN-code (if installed on the SIM card).
- 📞 Prioritize calls (if you use two SIM cards).
If your smartphone doesn’t see the network, try the following steps:
- Reset the device.
- In the Mobile Network section, select Network Mode: 4G/3G/2G (auto).
- Turn on and off Flight Mode (this resets the communication module).
- Check if the SIM card is blocked by the operator (for example, for non-payment).
If you use two SIM cards, you can set the settings to determine which one will be used for calls, SMS and mobile Internet by default, which is convenient if you have, for example, one SIM card for work and the other for personal needs.
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If after installing the SIM card, the phone writes "No Service" or "Emergency Calls Only", the problem is most likely on the operator's side: check the balance, card activation status or contact support.
Hybrid slot: how to combine a second SIM card and microSD
One of the main drawbacks of Redmi 8 users call hybrid slot, which forces you to choose between a second SIM card and a memory card.
Option 1: Use cloud services instead of microSD. Xiaomi offers free cloud storage Mi Cloud (5 GB), and also supports Google Drive, Yandex Drive and other services, which will free up the slot for the second SIM card.
Option 2: Buy an eSIM-enabled SIM (if your carrier provides such a service), in which case the physical SIM will remain one and the second will be virtual, freeing up the microSD slot. Unfortunately, Redmi 8 does not support eSIM, so this method is not suitable.
Option 3: Use OTG-You can connect the microSD to the card reader. USB-OTG, But it's inconvenient for constant use - the adapter will take up the connector and stick out of the phone.
If you’re critically important to both SIM cards and memory cards, consider buying a smartphone with separate slots (like the Redmi Note 10 or later).
What to do if the SIM card does not work after installation
If you installed the SIM card correctly, but the network never came up, the reasons could be both software and hardware.
1. Check the SIM card on another device.
Put it in another phone. If it doesn't work there, it's the card problem (it's probably damaged or locked by the operator). If it works, it's the Redmi 8 problem.
2. Examine the contacts of the SIM card and the slot.
If you have poor contact (oxidation, pollution), the network can disappear. Gently wipe the SIM card contacts and inside the slot with dry soft cloth. Do not use alcohol or liquids - this can damage the coating.
3. Reset the network settings.
Go to Settings → System → Settings Reset → Mobile Network Resets. This will remove the stored connection settings and force the phone to re-search the network.
4. Check the IMEI.
In rare cases, the phone's IMEI may go off (for example, after a failed firmware) resulting in network loss. You can find out the IMEI by dialing *#06#. If zeros or an error are displayed instead of digits, you will need to restore the IMEI through an engineering menu or service center.
5. Update the firmware.
Outdated software may contain bugs that affect the operation of the communication module. Check for updates in Settings → About Phone → System Update.
If none of these things work, the communication module itself may be faulty, so if you do, you can go to the service center, and don't try to disassemble the phone yourself, because you might lose your warranty.
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If the phone stopped seeing the SIM card after a fall or impact, the contact module with the motherboard most likely left, in which case only professional repair will help.