Installing a carrier card is the first and most important step after buying a new smartphone. Modern Xiaomi and Redmi devices are equipped with universal trays, but the extraction process can raise questions for those who move from button phones or models with a removable back cover. In this article, we will discuss in detail how to correctly and safely install nano-SIM in your gadget without damaging delicate mechanisms.
Before you start physically affecting the body, you need to make sure that you have all the necessary tools. Usually, a special needle is included with the device, but if it is lost, a regular stationery clip will fit, the main thing is to act carefully so that you do not scratch the frame or break the tray locks.
Some users mistakenly believe that the phone must be turned off, but modern standards allow hot card replacement.However, to initially configure the network and avoid software failures in determining the operator, it is recommended to install a SIM card when the device is turned off, this ensures that the network is correctly registered immediately after the device is turned on.
Tool preparation and location selection
The first thing you need to do is find the slot location, and on the vast majority of Redmi Note, Redmi and Mi models, the tray is on the bottom or the top end of the case, and you'll be able to look at the edges of the device carefully, and you'll see a narrow hole next to the elongated plastic element, and that's where the extraction is made.
You'll need a thin metal object to work with, and a branded paper clip from the box is perfect. If it's lost, you can use:
- 📌 A regular paper clip, straightening one of the ends.
- 📌 sewing needle (use with care not to prick your finger).
- 📌 A special key-key that often comes complete with covers.
It's important to understand that using things that are too thick, such as toothpicks or pins, can cause the machinery to break down. A toothpick can crumble inside the body, a pin can damage the contacts. A metal needle or paper clip is the best choice for hardness and diameter.
The tray extraction process
Once you've decided on the tool, hold the smartphone in your hand so that the screen is looking at you, and the bottom end is facing down or sideways. Find a small circular hole on the elongated bar. Put the tip of the clip perpendicular to the surface of the case directly into the center of the hole.
Press the paperclip with moderate force. You should feel a slight click, after which the tray will move out of the case by a few millimeters. You do not need to push with all your strength - if the tray does not go out, check whether you hold the tool evenly. Xiaomi uses reliable spring mechanisms that fire from a clear press.
⚠️ Warning: Never attempt to smear the tray with nails or sharp objects from the side of the slit unless it leaves after pressing.This can lead to deformation of the plastic frame and the appearance of gaps in the body.
Once extended, gently pull the tray with your fingers until it is fully removed, and place it on a flat surface, preferably on a soft cloth, so that the plastic guides don't scratch, and you now have access to the contact areas.
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If the tray is difficult to extract even after pressing, it may have been dust or pile. Try blowing the hole with compressed air before trying again.
Orientation and installation SIM-map
The most important thing is to position the map correctly. Redmi smartphones today are exclusively nano-SIM. It's the smallest standard, with little plastic edging around the chip. If your card is large (mini or micro), it needs to be broken down or replaced by a carrier.
Look at the tray, and it has a schematic hint at the bottom of it that shows how the card should lie. Usually, the bevelled corner of the card should match the bevelled angle of the notch in the tray. The chip should be pointed down to the contacts of the smartphone, or up, depending on the particular tray model, but most often in modern Xiaomi chip looks up, at the screen, when the tray is inserted.
Make sure the card sits tightly in the recess and doesn't stagger. If it protrudes over the edges of the tray, you've misidentified the side or size, and inserting a skewed card can lead to a jamming of the tray inside the phone.
☑️ Correct installation of the map
Features of two-symbol models
Most current Redmi and Poco models support two SIM cards at the same time, and the tray has two separate notches, allowing you to use different carrier numbers without having to switch, but it's important to know which slot is the main one if you're planning to use memory cards.
Some budget models have a combined slot (hybrid) in which either a second SIM or a microSD card can be installed in the second slot. It is technically impossible to install two SIM cards and a flash drive simultaneously in such models.
| Type of tray | Slot 1 | Slot 2 | Opportunities |
|---|---|---|---|
| Separate | Nano-SIM | Nano-SIM | Two SIMs + SD card |
| Hybrid | Nano-SIM | Nano-SIM / microSD | Two SIMs OR One SIM + SD |
| Mono | Nano-SIM | - | Only one SIM + SD card |
When you set up two cards, pay attention to slot numbering. Slot 1 is usually considered a priority for mobile internet and default calls. You can easily change their purpose programmatically in the system settings after turning on the phone.
Turning on the phone and setting up the network
Once the cards are placed in the tray, carefully insert it back into the body, make sure that the guides match the slots, and move the tray until the characteristic click. It must enter flush with the body without forming steps. Now you can turn on the device.
At the first load, the system MIUI or HyperOS will automatically detect new SIM cards, and a request for input will appear on the screen. PIN-If you have previously installed security on cards, enter the code provided by the operator to unlock access to the network.
What to do if your phone doesn’t see your SIM card?
After successfully unlocking, signal level indicators with the letters G, E, 3G, 4G or 5G will appear at the top of the screen. This means that the device has successfully registered with the operator's network. If there are no indicators, check whether the "Enable" option is activated in the settings of the corresponding SIM card.
⚠️ WARNING: If you move an old SIM card from another phone, make sure it doesn't have any marks of severe wear or scratches on the chip.A damaged chip may not be readable by the new device, even if it was working on the old phone.
Software configuration and management of SIM
The physical installation is complete, but you need to configure the software part to work comfortably. Go to the Settings menu, then select SIM cards and mobile networks. Here you will see a list of installed maps.
This section allows you to specify a name for each card (e.g., “Work” or “Personal”), which will make it easier to identify when calling, and it also sets the priority of which card will be the default call and which data transfer will be made.
- 📶 Mobile Internet: Select the card with the largest tariff packet of traffic.
- 📞 Voice calls: install a card with cheap minutes or unlimited to your operator's numbers.
- 💬 SMS: specify the number to which confirmation codes from banks most often come.
For users who travel frequently or change numbers, the feature of switching maps straight from the notification curtain is useful «SIM-Maps to your desktop or control center to quickly change an active map for the Internet without diving deep into the menu.
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Properly programmatically prioritizing SIM cards saves money on communications and avoids the occasional cost of roaming or paid subscriptions.