Xiaomi Redmi 4X It remains one of the most popular budget smartphones even years after its release, and its reliability and functionality have been appreciated by millions of users, but beginners often have questions about basic configurations, such as how to insert correctly. SIM-In this article, we will discuss the process of installing the SIM by step, the types of cards supported, compatibility with operators and typical errors that can lead to a lack of network.
Redmi slot design 4X It has its own characteristics: it is hybrid, that is, it allows you to choose between the second. SIM-This requires careful installation, especially if you're using two SIMs at the same time, and we'll also look at how to check if the phone recognizes the card, and what to do if the network doesn't appear after you install it.
Preparation: which SIM-Cards are suitable for Redmi 4X
Before installing the SIM, it is important to make sure that its format meets the requirements of the smartphone. Xiaomi Redmi 4X supports:
- 📱 Nano-SIM (main slot) – the standard size for modern smartphones (12.3 × 8.8 mm).
- 📱 Micro-SIM (second slot) - less common format (15 × 12 mm), but suitable for hybrid slot.
- 💾 MicroSD (up to 256 GB) – alternative to the second SIM-card.
If you're old. SIM-Mini-SIM map (25 × 15 It can be cut to Nano-SIM by a special stapler or in the cabin of the operator, using an improperly cropped SIM can damage the contacts of the slot or the card itself.2 Iota or Iota) provide universal logging cards for all formats – they are easy to adapt to Redmi. 4X.
Also check if your carrier supports 4G LTE on the frequencies your smartphone is using:
| Operator. | 4G support for Redmi 4X | Notes |
|---|---|---|
| MTS | Yes. | It operates on Band 3/7/20 frequencies. |
| Beeline | Yes. | Band 3/7/20, possible regional restrictions |
| MegaFon | Yes. | Band 7/20, the best coverage in cities |
| Tele2. | Partially. | Band 3/20, 4G may not work in rural areas |
| iota | Yes. | Band 7/20 only requires APN setup |
⚠️ Note: If you use two of these SIM-cards at the same time, the smartphone will not be able to connect to the 4G On both sims, only one (main) and the second will work in the mode. 2G/3G.
Where is the slot for SIM-maps 4X
Unlike many modern smartphones, where the slot is on the side, in the Redmi 4X it is located on the top end of the device. This is a typical solution for Xiaomi models from 2017-2018.
- Turn off your smartphone (optional, but recommended for safety).
- Take a paper clip or a special key to retrieve the SIM card (goes with your phone).
- Insert the paperclip into a small hole next to the slot and press slightly until the tray is pushed out.
Do not use sharp objects (needles, knives) to avoid damaging the O-ring or slot contacts.If the tray does not come out the first time, check if it is jammed due to dust or deformation.
Step-by-step instruction: how to insert SIM-map
Now, to the installation process itself, follow the instructions carefully to avoid the typical errors:
Turn off your smartphone (optional)
Prepare a paper clip or key
Check the format SIM-map (Nano/Micro)
Clean the SIMKA contacts with a dry napkin-->
- Remove the tray as described above. Place it on a flat surface with the contacts up.
- Place it. SIM-slot-card: 📱 For the first SIM (Nano-SIM) – the top slot. 📱 For the second SIM (Micro-SIM) or MicroSD, the bottom slot.
Make sure the angle of the card matches the angle on the tray.
Carefully squeeze the tray in.
Turn on the phone.
If the SIM is not determined after installation, try:
- 🔄 Reboot your smartphone.
- 🧹 Clean the contacts of the SIM and slot with dry soft fabric.
- 🔧 Check network settings in Settings → SIM-maps and mobile networks.
What to do if the tray is not inserted back?
How to set up SIM-map
After successfully installing the Redmi 4X SIM, you may need to adjust your card, especially if it’s new or from another carrier.
- Activate Mobile Data: Go to Settings → SIM-Maps and mobile networks. Select the SIM you want to turn on the Internet for. Activate the switch Mobile data.
- Set up an access point (APN): In the same menu, select Access Points (APN). Click Add and enter your operator’s settings (can be found on its website). 💡For most Russian operators, it is enough to choose APN If the Internet is not working, check the settings manually: for MTS - Internet.mts.ru, for MegaFon - Internet.
- Set the priority of SIMs for calls: In Settings → SIM-Select which SIM to use by default for calls and SMS.
If the internet is still not working after setting up, check:
- 📶 Signal level (you may be in a low-cost area).
- 💰 Account balance (some operators with zero balance blocked access to the Internet).
- 🔄 Network Mode: Try to manually select 4G/3G/2G (auto) in settings.
Frequent mistakes and their solutions
Even with the right SIM setup, Redmi 4X users sometimes run into problems.
| Problem. | Possible cause | Decision |
|---|---|---|
| Symbol is undetermined | Incorrect installation, contamination of contacts | Reinstall the SIM, clean the contacts with alcohol |
| No network. | No coverage, incorrect APN settings | Check coverage area, reset network settings |
| 4G is not working | Simka inserted into second slot, wrong network mode | Transfer the SIM to the first slot, choose 4G manually |
| Smartphone asks for PUK-code | Three times injected with an incorrect PIN | Enter PUK (indicated on the plastic of the SIM card or in the operator’s personal account) |
Particular attention should be paid to situations where the smartphone does not see the second SIM, this may occur due to:
- 🔌 Memory card conflict (if a hybrid slot is used).
- 🛠️ Software failure (helps reset network settings to Settings) → System system → Resetting settings → Resetting network settings).
- 🔋 Slot malfunction (requires diagnosis in the service center).
⚠️ Warning: If the smartphone starts to warm up or discharge quickly after installing the SIM, this may indicate a short circuit in the slot. Immediately remove the card and check it on another device.
How to Insert MicroSD Instead of the Second SIM-map
Redmi Hybrid Slot 4X Let us choose between the second SIM-If you need to expand your memory, follow this instruction:
- Turn off your smartphone and remove the tray.
- Place the MicroSD in the bottom slot (the same as the second SIM). Make sure the card contacts are pointed upward.
- Put the tray back in and turn on the phone.
- After downloading, go to Settings → Memory and configure the card as portable storage or internal memory (formatting will delete all data!).
Important nuances:
- 📱 When using MicroSD, the second SIM is turned off – they are incompatible in one slot.
- 🔄 The speed of the memory card depends on its class (recommended Class 10 or Class 10). UHS-I).
- 🚫 Do not remove the memory card "hot" - this can lead to data loss.
💡
If you use a microSD as internal memory, the smartphone will encrypt it, and once removed, the card will not be read on other devices without being reset to factory settings.
Video instructions and additional materials
For clarity, we recommend watching a video with a step-by-step installation SIM-maps 4X:
Video: [Insert YouTube link with "How to Insert SIM in Xiaomi Redmi 4X" caption]
It is also useful to read the official documentation:
- 📄 Technical characteristics of Redmi 4X on the Xiaomi website (section "SIM Card").
- 📡 Discussion on 4PDA (Relevant advice from users).
If you still have questions about network setup or tariff choice, contact the support of your operator or the official chat Xiaomi Russia in Telegram.