Xiaomi Redmi 8 is one of the most popular budget smartphones of the brand, released in 2019.Despite the simplicity of design, the replacement is a new model. SIM-The cards in this model raise questions among users, especially if it is a first installation or transition to nano-SIM. Unlike flagship devices with hybrid slots, Redmi 8 supports two nano-SIMs. + microSD, but requires care when handling a tray.
In this article, you will find not only step-by-step instructions for replacing the SIM, but also solutions to typical problems: why the smartphone does not see the card, how to properly trim the SIM into the nano format, and what to do if the tray is jammed. We will also discuss the unique feature of the Redmi 8 - the lack of a spring mechanism in the tray, which is why many users mistakenly think that they broke the device on the first extraction.
Preparation for replacement SIM-maps: what you need
Before you start replacing, make sure you have everything you need. Unlike current models with electronic SIM (eSIM), Redmi 8 only works with physical nano-SIMs. If your current card is of a different format (mini or micro), it will have to be cropped or replaced in the cabin of the operator.
List of tools and materials:
- 🔧 A paper clip or needle (complete with your phone, but often lost) will do any thin metal wire.
- 📱 Nano-SIM (size) 12.3×8.8 If you have a micro-SIM, you can cut it off, but you'd better get a new one from the operator.
- 🔦 Lights (optional) will help you see the slots of the tray in poorly lit areas.
- 🧴 Alcohol wipes to clean the contacts. SIM-Cards and trays if the phone does not see the network.
It is important that you use two SIM-maps, make sure they support the right ranges.Redmi 8 network 4G, second SIM may be limited 3G/2G depending on the region. Check the settings in the Settings menu → SIM-maps and mobile networks.
Where is the slot for SIM-maps in Redmi 8
Xiaomi Redmi 8 trays for the SIM-The map is located on the left side of the body (if you look at the screen), and it's easy to recognize from the small hole next to it, which is the extraction connector. Don't confuse it with the microphone or speaker, which is on the lower and upper edges!
To avoid making a mistake, pay attention to the following signs:
- 📍 Inscription SIM or a card pictogram near the hole.
- 🔍 The tray is approximately in the middle of the side face, closer to the upper edge.
- 🚫 On the opposite (right) side there are volume and power buttons - there is no slot there.
If you're still in doubt, put a flashlight on the side, and the metal tray will protrude a little bit inside the case, and the plastic hole for the paper clip is clearly visible.
Photo of slot location
⚠️ Attention: Don't try to remove the tray with a toothpick or plastic items. They can break inside the hole, and you'll have to disassemble the phone to retrieve the debris. Use only metal clips or special keys!
Step-by-step: how to remove the tray for SIM-map
The process of removing the tray in Redmi 8 is easier than in models with retractable mechanisms (for example, in Redmi Note 10), but requires caution.
Follow the algorithm:
- Turn off your phone (optional, but recommended for safety).
- Take a paperclip and straighten it so that the end is straight and thin.
- Put the paper clip in the hole next to the tray, and you'll feel a little bit of resistance.
- Press with a little effort - the tray should "shot" outwards by 1-2 mm.
- Carefully pull the tray with your fingers until fully removed.
If the tray does not come out the first time:
- 🔄 Check that the paper clip is inserted to the end (sometimes it rests on the body).
- 🔍 Examine the hole for contamination (dust, dirt can block the mechanism).
- 📱 Try removing the tray with your phone on - sometimes it works.
The tray is on the left side of the phone.
The paperclip is straight and thin.
The phone is on a flat surface.
The paper clip hole is not clogged with dust.-->
In Redmi 8, the tray doesn't have a spring mechanism, so it won't pop out completely by itself -- you have to tuck it in with your fingers. That's normal and it's not a breakage!
Installation SIM-Maps: proper location and order
Redmi 8 tray supports two nano-SIM + microSD, but there are nuances with their location. If you install the cards incorrectly, the phone may not see the network or memory.
| Position in the tray | Type of card | Supported functions | Notes |
|---|---|---|---|
| Slot 1 (top) | nano-SIM | 4G/3G/2G, main network | Recommended for the main SIM |
| Slot 2 (medium) | nano-SIM | 4G/3G/2G, second network | 3G may be limited in some regions |
| Slot 3 (bottom) | microSD | Memory up to 512GB | Not supportive. SIM-map! |
Installation instructions:
- Place the tray on a flat surface with contacts upwards.
- Place the nano-SIM in slot 1 or 2 so that the beveled corner of the card coincides with the angle of the slot.
- If you install a microSD, insert it into slot 3 (usually marked with a memory card icon).
- Carefully squeeze the tray back into the phone before you click. Don't make an effort - it should come in smoothly!
⚠️ Note: If the phone says "No network" after installation, or "SIM-card not supported," check: "The card is inserted on the correct side (the chip must be addressed to the tray contacts). SIM No scratches or dirt (wipe the contacts with an alcohol napkin) The tray is inserted to the end (sometimes it seems fixed, but it doesn't really squeeze).
💡
If you're old. SIM-A mini or micro card, don't cut it with scissors -- you'd better use a cropping template, or get a new nano-SIM from the operator for free!
What to do if your phone can’t see SIM-card
If, after installing a new SIM-Redmi 8 cards don't catch the network, the problem can be both in the card itself and in the phone settings:
Hardware problems:
- 🔌 Contaminated contacts. SIM-cards and tray with an alcohol napkin. Do not use wet napkins or abrasives!
- 🔧 A bent tray. If you put too much effort into extracting, the contacts could shift.
- 📶 Antenna problems, phone drops, antenna plume may have gone, and then we need a diagnostic at the service center.
Programmatic problems:
- 📱 Incorrect network settings. Go to Settings → SIM-Maps and mobile networks and select network mode 4G/3G/2G (motor-car).
- 🔄 Failure IMEI. If the phone says "Valid." IMEI", Try to restore it through the engineering menu (code ##4636##).
- 🔒 Operator lock: If the phone is purchased on credit or from the operator, it can be locked to a specific location. SIM. Check in Settings → The phone. → Status. SIM-map.
If none of these methods worked, try inserting. SIM-If it doesn't work and there, the problem is the map, not the Redmi 8.
💡
In 90% of cases, the absence of a network after replacing the SIM is due to improper installation of the card or contamination of contacts.
How to cut SIM-Nano-SIM card for Redmi 8
If you only have a micro-SIM or a mini-SIM, you can trim it to a nano-format, but that's risky. A 1 mm error can damage the chip and you'll have to change the card. We recommend getting a new nano-SIM from the operator (usually free), but if that's not possible, follow the instructions:
Step 1: Preparation
- 📏 Draw a patterned markup on the map (see photo below). Nano-SIM is sized. 12.3×8.8 mm.
- 🖊️ Use a thin marker to make the lines clear.
- 🔍 Make sure the chip doesn't fall under the cutting line!
Step 2: Pruning
- 🔪 Take sharp scissors or a stationery knife.
- 📐 Cut straight into lines, slowly. Better cut a little than overdo it.
- 🧼 After pruning, clean the edges with sandpaper (grain content 1000)+), so they don't scratch the tray.
Step 3: Checking
- 🔍 Compare the cropped card to the original nano-SIM (e.g. from another phone).
- 📱 Put it in Redmi 8 and check the network, and if the phone can't see the card, it's damaged.
SIM trimming pattern
⚠️ Warning: If you damage a chip while pruning, you can't restore the card! operators usually issue a new one SIM Free of charge on presentation of passport, but the old number can be blocked for 24 hours.
Frequent Mistakes and How to Avoid Them
Even experienced users sometimes make mistakes when replacing. SIM-Xiaomi Redmi 8 cards, here are the most common and ways to prevent them:
1. Use of inappropriate tools
- ❌ Error: Removing the tray with a toothpick, a needle from a syringe or a plastic fork.
- ✅ Solution: Use only a metal clip or a special key from the kit.Plastic can break inside the hole.
Incorrect position SIM-map
- ❌ Error: Inserting the card "upside down" (chip up) or not until the end.
- ✅ Solution: Always make sure that the bevelled corner of the card matches the slot angle.The card should sit tight, without backlash.
3. Application of excessive force
- ❌ Error: Pressure on the tray when extracted or installed, resulting in bent contacts.
- ✅ Solution: The tray must come out and enter smoothly. If it's jammed, don't pull, check if something is interfering.
4.Ignoring the second slot
- ❌ Error: Installation of microSD in a slot for SIM-maps (or vice versa).
- ✅ Solution: Redmi 8 microSD slot is separate (bottom). SIM-Cards are placed only in the upper and middle slots.
If you make one of these mistakes, don't panic. Most of the time, the problem is solved by reinstalling the card or cleaning the contacts. Only if you have mechanical damage (a bent tray, a broken clip hole) will you need repair.