Xiaomi Redmi 12 is one of the most popular budget smartphones of 2023, combining modern design, performance and flexible connectivity options. But even experienced users sometimes have questions about basic operations, such as how to install correctly. SIM-Installation errors can lead to network failure, contact damage, or even tray failure, and in this article, we'll take the process Step-by-step, take into account all the nuances of the model, and give you tips on how to choose. SIM-map.
The Redmi 12 design involves a hybrid slot, which means you can install either two nano-SIMs, or one nano-SIM and a microSD card (up to 1TB). Importantly, the slot does not support micro-SIM or mini-SIM cards - they will have to be trimmed or replaced. If you encounter an installation for the first time, take your time: improperly removing the tray can damage the locking mechanism.
What are they? SIM-The cards are supported by Xiaomi Redmi 12
Xiaomi Redmi 12 is only compatible with nano-SIM cards (4FF, size 12.3×8.8mm). This is standard for most modern devices, but if you have a different size card, you can:
- 🔄 Cut yourself (risk of chip damage – not recommended without experience).
- 🏦 Replace the operator in the cabin (free of charge while maintaining the number).
- 🛒 Buy a pruning adapter (cost) ~100–200 ₽).
The hybrid slot allows you to combine:
- 📱 Two nano-SIM (Dual mode, but without support) 5G both cards simultaneously).
- 📱 One nano-SIM. + microSD card (up to 1 TB, exFAT format).
Note: If you choose the microSD option, the second option is the SIM-The card won't work, either. 12 It doesn't support eSIM -- only physical cards. SIM net-wired 4G/5G Use the official website of the operator or USSD-request *111# (for MegaFon).
Where is the slot for SIM-maps in Redmi 12
Xiaomi Redmi 12 slot for the game SIM-The map is located on the left end of the case (if you look at the screen with the front side), it is easy to recognize by the small hole for the extraction tool. SIM card-pictogram.
It is important not to confuse the slot with:
- 🔊 Microphone (located at the bottom next to the connector) USB-C).
- 🔈 Dynamics (lattice at the bottom).
- 📍 Infrared port (upper end, if you have one in your modification).
If you are not sure, flash a flashlight: in the slot hole will be visible metal locking mechanism. on some versions of the Redmi 12 (for example, Redmi 12 5G) slot location may be slightly different — check in the documentation for your modification.
Step-by-step instruction: how to insert SIM-map
Before installing, make sure that the smartphone is turned off - this will prevent failures in the communication module.
- 📱 Xiaomi Redmi 12 Smartphone.
- 🪛 Paperclip or special key for extracting the tray (comes complete).
- 📇 Nano-SIM card (or two if you don’t use microSD).
☑️ Preparation for installation SIM-map
Now follow the instructions:
- Insert a paper clip (or key) into the slot hole before clicking.The tray should extend slightly.
- Carefully pull the tray over yourself - do not make efforts not to break the guides.
- Put it down. SIM-card(s) in the tray contacts down, combining the notch on the card with the ledge in the tray. For microSD, use a separate slot (usually marked as SD).
- Insert the tray back before you click. Make sure it sits flat - skewings can lead to poor contact.
After turning on your smartphone, check for network: swipe down from the top edge of the screen and make sure that the operator icons (such as MTS or Beeline) appear.If there is no network, restart the device or check that the card is installed correctly.
Frequent Mistakes and How to Avoid Them
Even with the seemingly simple process, users often make mistakes that lead to communication problems.
| Mistake. | Effects of consequences | How to fix it |
|---|---|---|
| Installation of SIM contacts upwards | Lack of network, damage to contacts | Turn the map over and reinstall |
| Using a micro-SIM without an adapter | The tray is not fixed, the card falls out | Cut or replace with nano-SIM |
| Power in tray extraction | Breakdown of the locking mechanism | Contact the service center |
| Installation of the tray curve | Poor contact, overheating of the module | Extract and insert exactly until click |
Critical error: Trying to insert the tray back without SIM-This can cause a short circuit in the communication module, especially if the contacts get moisture or dust. SIM, try to wipe the contacts of the card and tray with a dry napkin (without alcohol!).
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If the tray is jammed and it does not extend, do not try to pull it out with pliers - this will damage the case. Contact the Xiaomi service center or use a thin plastic card (for example, a bank card) to gently tuck the tray from the side.
How to extract SIM-map from Redmi 12
Extraction process SIM-The main rule is, don't pull the tray out by force unless it comes out the first time, and it can cause the spring mechanism to break down.
Instructions:
- Turn off your smartphone (required!).
- Insert the paperclip into the hole before you click. The tray should extend 1-2 mm.
- Carefully pull the tray over yourself, holding the smartphone with the other hand.
- Extract. SIM-card(s) and/or microSD.
If the tray doesn't come out:
- 🔧 Check if the garbage got into the hole (you can blow a can with compressed air).
- 📱 Try to remove the tray with the smartphone on - sometimes the mechanism unlocks.
- 🛠️ If nothing helps, do not take risks – contact the service.
What to do if the tray breaks down?
Problems with SIM-map after installation and their solutions
After installation SIM-Smartphones do not catch the network, do not rush to carry it for repair. In 80% of cases, the problem can be solved independently:
⚠️ Attention: If Redmi 12 writer "SIM-The card is not supported, this may mean that the card is damaged, blocked by the operator or is incompatible with networks. 4G/5G. Check it on another phone.
Common problems and solutions:
- 📵 No network: Reboot your smartphone, check the correct installation of the card, turn on the "Only" mode 4G" in settings (Settings) → SIM-maps and mobile networks → Type of network).
- 🔄 Constantly switching between 3G and 4G: Turn off automatic network selection and select the mode manually.
- 📱 Not defined second SIM: Make sure the tray is inserted to the end.In the hybrid slot, the second is the second. SIM It may not work if you have a microSD installed.
- 🔋 Battery goes down quickly: Check if the Network Search function is activated in roaming (Settings) → SIM-map → roaming).
If the problem persists, try resetting your network settings:
Settings → SIM-cards and mobile networks → Resetting mobile network settingsThis will remove the saved APN access points, so you will have to reconfigure them (options can be requested from the operator).
Selection advice SIM-maps for Redmi 12
To avoid communication problems, choose SIM-map with the features of the Redmi 12:
- 🌐 For 5G: Use it. SIM operators who support 5G NSA/SA (MTS, Beeline, Tele2). At Redmi. 12 4G module 5G absent.
- 📶 For travel: Make an option "World without borders" or buy a local SIM in the host country (check frequency compatibility).
- 💾 For microSD: If you plan to use a memory card, choose a class A2 (fast-write).
If you often switch between SIM-Cards (e.g. work and personal), consider buying Magnet SIM — A magnetically mounted adapter that allows you to change cards quickly without removing the tray, and it costs 300 times more. ₽.
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For maximum internet speed in Redmi 12 5G use SIM-card with support for VoLTE and VoNR. This will improve the quality of calls and stability of communication networks of the new generation.