Xiaomi Redmi 4X: insert SIM-map and network

Xiaomi smartphones have been the benchmark for reliability and functionality in the budget segment for many years, and the Redmi 4X model is no exception. Despite the fact that the device was released several years ago, it is still actively used due to its autonomy and a durable metal body. One of the first steps that an owner must take after buying or resetting the settings is to install a mobile operator card to provide communication.

The installation process looks simple, but owners of budget models often have difficulty determining the type of tray and the correct orientation of the chip. In this article, we will discuss in detail how to insert a SIM card in the Xiaomi Redmi. 4X, To avoid damage to contacts or mechanical breakdowns of the device, you will learn about the nuances of hybrid slots and the correct network settings. MIUI.

Incorrect installation can cause the phone to stop seeing the network or only work in 2G mode, which is unacceptable in today's environment.We will consider not only the physical installation, but also the software configuration that is often required to correctly work two SIM cards at the same time.

Preparation for installation: necessary tools and completeness check

Before you start physically interfering with the design of the smartphone, you need to make sure that you have everything you need. To extract the tray complete with Xiaomi Redmi 4X comes a special key-clip, but it is very small and often lost immediately after unpacking. If the original tool is not available, you can use a thin needle or paper clip, straightened at right angles.

It is important that the chosen object is strong enough, but not too thick, so as not to damage the latch mechanism inside the housing. SIM-The right size card. Modern smartphones, including this one, work with the Nano-SIM format, which is the smallest standard in existence.

💡

If you SIM-Larger card (Micro or Mini), do not try to cut it with scissors yourself – contact the operator’s salon for a free replacement with Nano-SIM.

Make sure the smartphone is turned off before the procedure begins. Although modern phones support hot replacement, to correctly identify the network and avoid software failures in MIUI, it is better to manipulate when the power is turned off.

Location of the tray and types of supported cards

In the Redmi 4X, the SIM slot is located on the top end of the case, a classic location for devices from that period of release. The tray is retractable and requires careful handling. The feature of this model is the presence of a hybrid slot, which often causes confusion for users who first encounter Xiaomi equipment.

Hybridity means that the second compartment in the tray can perform two functions simultaneously, but not together. You can use either a second SIM card or a MicroSD card to expand storage. You can't physically fit two SIM cards and a memory card into this smartphone at the same time.

Let’s consider the main characteristics of the slot:

• 📱 Slot 1: Designed exclusively for Nano-SIM, supports all modern communication standards.
• 📶 Slot 2: Hybrid, accepts Nano-SIM or MicroSD (up to 128 GB).
• 🔒 Mechanism: Retractable, requires careful pressing of the key into the hole.

Visually, the tray is oblong with rounded edges, and on one side of the tray there is a small bevel that corresponds to the shape of the hole in the case, and attention: insert the tray in the correct orientation, so as not to break the guides inside the phone.

Step-by-step: how to properly remove and insert the tray

The most critical step is to physically install it. Take your smartphone in your hand so that the screen is pointing away from you and the top end is looking up. Find a small circular hole next to the tray frame. Put the key-clip perpendicular to the surface and press until you click. The tray should move out a few millimeters, and then it can be removed with your fingers.

Put the tray on a flat surface. You'll see two grooves. Usually one (often smaller or shaped) is for the first SIM card, and the second, longer or composite is for the second SIM card or memory card. In Redmi 4X, both SIM slots are Nano-SIM sized.

When you lay the card, look at the cut angle (scotch) on the plastic-based SIM card. It should exactly match the shape of the depression in the tray. If the card is difficult to fall or does not match in shape, do not press, turn it over. Contacts (the golden part) should look up if you look at the tray from above, or down if you look at the phone screen (depending on the design of the tray, in Redmi 4X the chip usually looks up when you put it in the tray).

Once the card is packed, put the tray back into the phone, so it's important not to mix the sides up. The tray should come in smoothly, effortlessly. If you feel resistance, flip it over, push the tray until it's a characteristic click or until it's equal to the frame of the case.

⚠️ Warning: Never put a tray in your phone without a set set SIM-cards or without a plug, if the design suggests it, as dust and moisture can get inside, which will lead to oxidation of contacts.

Network setting and choosing a priority slot in MIUI

After switching on the smartphone system MIUI It will automatically detect a new SIM card. If you have two cards, you'll be asked to configure their use. The settings interface allows you to flexibly manage your communication settings. Go to the Settings menu. → SIM-Maps and mobile networks to access full functionality.

Here you can assign which card will be used for mobile Internet by default and which will be used only for calls. This is especially convenient if you have unlimited Internet on one SIM and a packet of minutes on another, and the system allows you to change these settings on the fly without rebooting.

The main parameters that are worth checking:

• 🌐 Network type: Select Preferred 4G maximum speed.
• 📞 SIM For calls: You can select a specific map or leave a question Always ask".
• 💬 SIM for SMS: Assign the card with the largest message packet.

Also available in this menu is the function "Calling to another SIM", which allows you to avoid missing calls to the second card when you talk on the first card (provided you support the operator). For stable operation, it is recommended to activate the Advanced 4G LTE mode in additional settings, if available.

💡

Correct setting of priorities SIM-map MIUI Saves battery power and money by using the optimal tariff for each type of traffic.

Solution: the phone does not see the SIM card

There are situations when after installation the indicator of communication does not appear, or on the screen hangs the inscription "No" SIM-This can be caused by software failure or contamination of contacts. First of all, try rebooting the device. If it doesn't work, remove the tray and wipe the SIM contacts with a wipe or an alcohol wipe.

A common problem is that the card is not tightly attached in the tray. In budget models, sometimes there are back trays, in which case you can carefully (and very carefully!) put a micro-layer of paper under the map, but not on the contacts, to ensure a tighter press, but this is a temporary solution, it is better to replace the tray.

If the problem is not solved, check the following points:

• 🔍 Chip integrity: Are there scratches on gold contacts.
• ⚙️ Settings: Is not the mode "In the plane" enabled".
• 🔄 Reset: Try resetting network settings through the Settings menu → Advanced settings → Reset your Wi-Fi, mobile networks and Bluetooth settings.

In rare cases, the problem lies in the communication module of the smartphone, especially if the device has been hit or moisture, then you need a diagnosis in the service center.

⚠️ Note: Do not use metal objects to clean your contacts. SIM-card, as this may result in short circuit or erase of the protective layer on the chip.

Comparison of the characteristics of Redmi 4X slots

To fully understand the capabilities of your device, it is useful to know the technical differences between slots. Although visually they may seem the same, software they may have different priorities or frequency limits in some firmware modifications.

As you can see from the table, both slots support modern communication standards, which makes using the phone flexible. However, if you plan to use a large memory card to store media files, you will have to sacrifice a second SIM card.

Optimizing network performance for two SIM cards

Using two active SIM cards increases the load on the processor and modem of the smartphone, which can affect battery life. To minimize charge consumption, adjust the network settings correctly. Make sure that in your area there is a confident 4G signal, otherwise the phone will constantly search for the network, consuming the battery.

In Mobile Network settings, you can turn off data transfer for the second SIM card, leaving only voice calls, this will prevent background traffic consumption, it is also useful to periodically switch network mode to 3G Only or 2G Only if you are in the area of uncertain reception to stop constant reconnection.

For Redmi 4X owners, MIUI optimization is a feature that can automatically switch the Internet to a card with the best signal, which is located in the SIM card menu and is called "Switch Mobile Data", which allows you to connect continuously as you move.

⚠️ Note: When using two SIM cards in active mode 4G Your smartphone can get hotter. Watch the temperature of the case when you talk long or download files.

Final operational recommendations

Proper installation and configuration of the SIM card is the key to the stable operation of your Xiaomi Redmi 4X. Do not neglect regular cleaning of contacts and careful handling of the tray. Metal body of the phone removes heat well, but requires careful treatment of internal components.

If you change your SIM cards frequently, try to do so as little as possible so as not to unwind the tray spring mechanism. If you lose your key, store a spare needle in your phone case, and following these simple rules will prolong your device's life and ensure uninterrupted communication in any situation.

Remember, software settings are as important as physical installation. Check system updates regularly, as they often include improvements to your modem and network. Your smartphone is ready to go!

💡

Regular check of network settings and the purity of the SIM-card contacts are the main conditions for stable signal reception in Xiaomi smartphones.