Xiaomi Redmi 8
All the ways to install SIM
Redmi 8
Many people mistakenly think that the SIM insertion process is the same for all Xiaomi smartphones, but Redmi 8 has its own peculiarities. For example, it uses a hybrid slot that supports either two nanoSIMs or one nanoSIM + microSD memory card. The design of the tray requires accuracy - improper extraction can damage plastic latches. We will show in detail how to avoid such problems, what tools to use (and what not to do), and what to do if the smartphone does not see the SIM after installation.
If you have just bought a Redmi 8 bpd or pulled it out after a long downtime, this guide will help avoid typical errors. For example, many people do not know that in some smartphone modifications (for example, for the Indian market), the slot can be non-hybrid – this is important to consider when buying a microSD. We also want to know how to check if your Redmi 8 supports two. SIM-The cards are simultaneously, and what to do if one of them is not determined.
What are they? SIM-The cards are suitable for Xiaomi Redmi 8
Xiaomi Redmi 8 supports only nanoSIM (4FF format) — this is the smallest standard used in modern devices. If you have an old card (miniSIM or microSIM), it will have to be cropped or replaced in the cabin of the operator. Important: do not try to insert a microSIM without an adapter — this can damage the slot contacts.
Here are the key characteristics of supported cards:
- 📱 Format: nanoSIM only (12.3 × 8.8 × 0.67 mm)
- 🔄 Number: up to 2 cards (in hybrid slot)
- 🌍 Communication standards: 4G LTE (Band 1/3/5/7/8/20/38/40), 3G, 2G
- ⚡ Additional: VoLTE and VoWiFi support (depending on firmware)
Please note: if you are planning to use two SIM-The microSD slot will be locked (and vice versa) and this is a restriction of the hybrid design. SIM can operate 4G, Only one person will be active at the same time (the second one will switch to the second one). 2G/3G).
What will be needed for installation SIM-map
To remove the tray and install the card, you will need a paper clip or a special key (complete with the phone). If the key is not available, any thin metal wire or pin will work, as long as it does not bend or break when pressed. Do not use toothpicks or plastic items - they can break inside the hole.
Also prepare:
- 📎 Paperclip/key for tray extraction
- 🔍 Good lighting (small tray, easy to drop)
- 🧴 Alcohol wipes (if contacts are contaminated)
- 📱 Second second SIM MicroSD (if you plan to use it)
If you install a microSD, make sure it has a capacity of 256GB (maximum supported capacity for Redmi 8). Larger cards may not be recognized or work in a stable way, and it is also recommended to format the card in the FAT32 or exFAT file system before installation.
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Before removing the tray, turn off the smartphone - this will prevent accidental closure of contacts and resetting of settings.
Step-by-step: how to insert SIM in Redmi 8
Now, to the process itself, follow the instructions carefully so that you don't damage the slot or the card itself.
Step 1. Turn off your smartphone.
It's a must-do, working with SIM-If you have a card on your phone, you may have a communication module malfunction.
Step 2. Find a slot for SIM-map
In Redmi 8, the tray is located on the left side of the screen, marked with a small hole next to the volume buttons. Don't confuse it with a microphone hole!
Step 3. Remove the tray.
Insert the paperclip into the hole and press with force until the tray is extended by 1-2 mm. Then carefully pull it with your fingers. Do not put excessive effort - if the tray does not come out, check if the clip is skewed.
Step 4. Set it up. SIM-map
Put the nanoSIM in the appropriate slot on the tray (usually signed SIM1 or SIM2). The contacts of the card should be directed downwards, and the bevelled angle should match the shape of the groove. If you install two SIMs, repeat the action for the second slot.
Step 5. Put the tray back in place.
Carefully insert the tray back into the smartphone before the click. Make sure it sits flat - skewedness can lead to poor contact.
Step 6. Turn on the phone.
After turning on, wait until the smartphone determines the network operators. If one of the SIM is not recognized, restart the device or check the installation is correct.
☑️ Check before turning on the phone
Frequent Mistakes and How to Avoid Them
Even with the seemingly simple process, many users make mistakes that lead to a broken SIM or slot damage, and the most common ones are:
1. Misdirectional orientation SIM-map
If the card is inserted with contacts up or the wrong angle, the smartphone won't see it. Check the tags on the tray - usually there are schemes for correct installation.
2. Use of an incompatible microSD
Some memory cards (especially cheap no-names) may not be recognized. Use proven brands: SanDisk, Samsung, Kingston.
3. Use of force in the removal of the tray
If the tray doesn't come out, don't push harder -- check if it's jammed because of dust. Try wiggling the paperclip slightly or using another tool.
4.Install SIM in a dirty slot
Dust or oxidation of contacts can lead to poor communication. If the smartphone does not see the SIM, gently wipe the contacts of the tray and card with an alcohol napkin.
What if the tray is jammed?
⚠️ Warning: Never use sharp objects (needles, knives) to remove the tray, which can scratch the body or damage internal parts.
How to check if the phone recognizes SIM-map
After installing the card, turn on the smartphone and perform the following actions:
1. Checking in the status line
The top notification bar should display network icons (e.g., 4G, 3G or E) if instead of them, a cross or an inscription “No network” is lit, then the SIM is not recognized.
2. Settings SIM-map
Go to Settings. → SIM-This should show phone numbers and operator names, if they're empty fields, there's a problem with the card or slot.
3. Call test
Try to make an outgoing call or send SMS. If the call doesn't pass, check the balance or contact the operator - possibly, SIM-card blocked.
If your smartphone doesn’t see either of the two SIMs, try swapping them, and sometimes the problem is that the second slot malfunctions (especially if the phone falls).
| Symptoms. | Possible cause | Decision |
|---|---|---|
| The phone doesn't see any SIMs. | Incorrect installation, contamination of contacts | Reset the cards, wipe the contacts with alcohol |
| There's only one SIM visible. | The second slot or card is defective | Change the cards, check on another phone. |
| The network is constantly disappearing. | Bad contact, damaged tray. | Put a piece of paper under the card for density |
| SIM is recognized, but there is no Internet | Not configured with APN or operator lock | Check the APN settings in Settings → Mobile Network |
Can I use an adapter for microSIM?
No, Redmi 8 doesn't have a microSIM with an adapter, and the slot design doesn't have any extra bezels, and the adapter either won't fit in the slot, or it'll get stuck inside, and if you only have a microSIM, you'll have to trim it to the size of a nanoSIM or replace it in the carrier cabin.
Some users try to “undermine” the adapter with a file, but this is risky:
- 🔨 Can damage the slot contacts
- 📵 The map will hang out, which will lead to a bad connection.
- 💥 The adapter can jam when removed
If you need to use microSIM, it is better to temporarily insert it into another phone and transfer contacts to the new nanoSIM.
⚠️ Note: The Internet sells "universal adapters" for SIM-But for Redmi 8, they're not suitable because of the shape of the tray.
What to do if the slot is damaged
If the SIM is installed, the smartphone is no longer able to see the cards, or the tray is hanging, the fixing mechanism may be damaged.
1. Check visually
Light the slot hole with a flashlight. If you see bent contacts or plastic debris inside, don't try to remove them yourself - contact the service.
2. Try an alternative method of fixing
Sometimes it helps to put a thin piece of paper under a map (like a notebook) to improve contact, but it's a temporary solution.
3. Diagnostics in the service center
The cost of repairing the SIM slot in Redmi 8 usually does not exceed 1000-1500 rubles (depending on the region), in most cases, the masters replace the entire tray, rather than individual parts.
In Redmi 8, the SIM slot is connected to the motherboard with a flexible plume. If it is damaged during careless repairs, the entire board may need to be replaced, which will cost 3-5 times more.
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If your smartphone stops seeing SIM after falling or getting moisture, don’t try to disassemble it yourself, and in such cases, not only the mechanical parts, but also the chips of the communication module are often damaged.