Installing a mobile operator card is the first and most important step after unpacking a new smartphone. Xiaomi’s Poco M3 is equipped with a hybrid slot, which requires the user to be careful when choosing the configuration of communication modules. Installing the chip incorrectly can lead to the fact that the device will not be able to register with the network or damage mechanically.
In this article, we will discuss the process of extracting the tray, determine the correct position of contacts and consider the features of working with two SIM cards at the same time, and will also discuss the compatibility of card formats, since modern devices require accurate compliance with the dimensions of the Nano-SIM.
Before any manipulation of the case of the smartphone is extremely important to ensure the security of the device. SIM-POCO M3 This is only possible when the power is off or when it's off to avoid short circuits, and this simple rule will help keep the communications module running for years to come.
Preparation of the workplace and tools
To successfully install the communication module, you do not need a complex technical arsenal. SIM-If the original key is lost, it can be replaced with a regular paper clip, having straightened it beforehand.
It is recommended to perform the procedure on a table with good lighting, covered with soft fabric.This will prevent the slipping of small parts and protect the glass back panel of the Xiaomi Poco M3 from accidental scratches in the event of a fall.
Pay attention to the state of your own SIM-Gold contacts must be clean, free of oxidation and greasy spots. If the card has been used before, wipe it with a dry soft wipe. Finger fat can worsen contact and cause periodic network failures.
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Use soft fabric without pile to wipe contacts SIM-cards so as not to leave microparticles interfering with the connection.
Slot Anatomy and Tray Search in Poco M3
The hybrid slot in Xiaomi and Poco smartphones is usually located on the lower end of the case, next to the Type-C charging connector and speaker. In the Poco M3 model, the tray is hidden under a thin metal frame and requires careful handling. On the side of the clip hole, a small icon is often applied to indicate the function of the slot.
The tray is a metal plate with two indentations, one designed exclusively for a memory card or a second SIM, and the other has a specific shape that repeats the circuitry of the chip, and it is important not to confuse the sides, since the card must lie in the same plane with the frame of the tray.
There is a common misconception that you can put a memory card and two SIMs in a hybrid slot at the same time, which is categorically wrong. Mechanical pressure can break the plastic guides inside the case, and it will become impossible to remove the tray without disassembling the phone.
- 📍 The tray is on the lower edge of the device, to the left of the charging port.
- 🔍 Pay attention to the beveled corner of the map - it should coincide with the shape of the depression.
- ⚙️ Hybrid slot allows you to choose the mode of operation: two SIM one SIM + memory-card.
- 🚫 Do not try to push the card unless it enters freely and effortlessly.
Step-by-step installation instructions SIM-map
The installation process requires a consistent execution of actions. First, take the key-clip and insert it into a circular hole next to the tray. Press strictly perpendicular to the case until you feel a slight click and spring resistance. The tray should extend a few millimeters, after which it can be removed with your fingers.
Put the extracted tray on a flat surface. Make sure you correctly determine which side the card should lie on. In the Poco M3, the chip always points down to the tray contacts, and the bevelled angle corresponds to the shape of the notch. If you only use one SIM card, place it in a slot designated SIM 1 (usually the hole closest to the edge).
☑️ Installation checklist
Once the card is placed, carefully insert the tray back into the case. Make sure it enters smoothly and meets no resistance. If the tray is stuck, do not press, remove it and check the position of the card again. A properly installed tray should be level with the body without facing out.
Turn on your smartphone with the power button. 30-60 The signal level indicators and operator name should appear on the screen after the switch on. If this does not happen, check if it is activated. SIM-card from your provider.
What to do if the tray is not removed?
Configuration of the two SIM-memory-card
Users often wonder how to combine two numbers and photos in one device. The Poco M3 hybrid slot offers flexibility but has limitations. You can use two Nano-SIMs at the same time, which is convenient for separating work and personal calls, or replace one with a microSD card with up to 512 GB.
When you install two SIM cards, it's important to know which one will be used for mobile Internet by default. In the MIUI settings, you can flexibly manage this setting. Usually, the SIM 1 slot is a priority for data transfer, but this can be changed programmatically at any time without removing the tray.
If you decide to install a memory card, it will take the place of a second SIM card, in which case the phone will work in one SIM mode, which is the best option for those who store large volumes of media files, games and applications on the device.
| Configuration | Slot 1 | Slot 2 | Note |
|---|---|---|---|
| Two SIMs. | Nano-SIM | Nano-SIM | Both active, 4G on one |
| Simka + Memory | Nano-SIM | microSD | Expansion of the vault |
| One sim | Nano-SIM | Empty. | Standard use |
| Only memory. | microSD | Empty. | Tablet mode (no calls) |
Network settings after installation
After you physically install the map, you need to make sure that the software part is configured correctly. → SIM-Maps and mobile networks. This shows the status of each card installed. If the status is "Unknown" or "No network", try to switch the network type.
To work fully on high-speed Internet, make sure you choose 4G/LTE mode. In some regions, settings may get confused, so it makes sense to check the APN hotspot. This data usually comes automatically, but you can enter it manually by taking information from your carrier's website.
If the phone offers to update your network settings or reboot after you find a new SIM, you'll agree. This is the standard procedure for setting up your carrier profiles. In rare cases, you may need to manually enter MMS and Internet settings.
⚠️ Attention: If after installation SIM-Phone cards are constantly being requested PUK-If you're not going to do it, you're going to have to go to the phone and get a replacement.
Diagnostics of problems with map definition
There are times when the card is physically set correctly, but the phone can't see it. First of all, check if the contacts in the tray are dirty. Blow into the slot or clean it carefully with a dry toothbrush. Dust and pile can isolate the contacts from the chip.
It is also worth checking if it is not damaged. SIM-If it doesn't work there, the problem is the card's plastic or chip, and it needs to be replaced by the carrier. Old cards cut with scissors under Nano-SIM often work in an unstable way because of broken geometry.
A software failure of the communication module can be fixed by resetting network settings. This action will not delete your personal files, but will return all network settings to factory values. Path to function: Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth.
- 🔄 Reboot the device after each SIM card reinstallation.
- 🧹 Wash the SIM contacts with an alcohol napkin before installation.
- 📶 Check if the SIM card itself is included in the settings MIUI.
- 🔧 Make sure the tray is inserted before the characteristic snapping of the fixation.
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If the SIM card is not detected on another phone, the problem is with the card itself, not the Poco M3 smartphone.
⚠️ Note: Use of adapters (adapters) for SIM-Larger format cards (Mini or Micro) in a Nano-SIM slot are highly discouraged, and can get stuck inside the case, and only be retrieved at a service center.