What? SIM-The card is needed for Xiaomi Redmi 4X: full-format analysis and settings

Owners of the legendary Xiaomi Redmi 4X budget smartphone often face the need to replace or install a new SIM card, especially when switching from old devices or changing the operator. The issue of format compatibility becomes critical, as trying to insert the wrong plate can damage the tray or the reader itself. Modern communication standards dictate their terms, and the Redmi 4X is no exception, requiring compliance with certain technical parameters for stable operation.

In this article, we will discuss in detail what kind of card format supports this device, how to properly prepare plastic from the operator and what to do if the phone does not see the network. You will learn about the nuances of working with two SIM cards, the features of the hybrid slot and the methods of forced inclusion of 4G. The device works exclusively with nano-SIM cards (4FF), the use of adapters is not recommended due to the risk of getting stuck. Understanding these details will help avoid typical errors during operation.

Technical characteristics of the Redmi 4X slot

Xiaomi Redmi 4X, released in 2017, already met modern standards for component miniaturization. Engineers equipped the device with a slot designed for cards of the smallest size at the time. This solution saved the interior space of the case to install a more capacious battery, which became one of the main features of the model, the slot is made in the form of a retractable tray located on the upper end of the case.

Structurally, the tray is hybrid, which means there are two seats with certain limitations: the first seat is always for the main SIM card, the second is either for the second SIM or for the microSD memory card. Simultaneous installation of two SIM cards and a memory card is physically impossible without the use of cloud storage or OTG-The clamping mechanism is well-designed, but requires careful extraction.

Support for communication standards in Redmi 4X also plays an important role. The device supports 2G, 3G and 4G (LTE) networks. However, to work at maximum speeds, not only the correct physical card is required, but also the appropriate configuration in the software. Some older SIM cards released more than 10 years ago may not support 4G protocols, even if they are trimmed to the desired size.

⚠️ Warning: Never try to force a SIM card into a slot. If the card doesn't enter easily, you're using the wrong format or you're not navigating the chip correctly. Forced pressure will cause the contact pins inside the phone to break.

Format SIM-Nano-SIM vs. Micro-SIM

The basic question that users have is, what kind of Sim card is in the xiaomi redmi 4x? The answer is unambiguous: it's a nano-SIM format. It's the standard that's used in all modern smartphones. It's not like the micro-SIM predecessor is because there's no plastic frame around the gold chip. In the nano-SIM, the chip occupies almost the entire map area, leaving only a minimal margin.

The use of adapters to insert a larger card into a nano-SIM slot is strongly discouraged. The thickness of the adapter often exceeds the permissible norms, which leads to a jamming of the tray inside the case. It is almost impossible to remove a stuck tray without disassembling the phone and using special tools, and the risk of damaging the motherboard is very high.

If you have a micro-SIM card or a standard large SIM, the best solution is to contact your carrier's salon, and replacing the card with a nano-SIM is usually free or costs a symbolic amount, while the number and tariff are saved, which guarantees the perfect cut geometry and the correct thickness of the plastic.

• 📏 Nano-SIM: Sizes 12.3 × 8.8 mm, thickness 0.67 mm is the only suitable format.
• 📐 Micro-SIM: Sizes 15 × 12 This is too large and requires replacement by the operator.
• 💳 Standard SIM: size 25 × 15 mm - suitable, requires replacement.
• 🔒 eSIM: Virtual Card – Redmi 4X It does not support this technology hardware.

Installation instructions SIM-map

The process of installing the card in Xiaomi Redmi 4X is simple, but requires a sequence of actions. First, make sure that the phone is turned off, although modern smartphones support hot replacement, reinsurance will not be unnecessary.

Use a special metal clip that comes with the kit, or a thin needle. Put it in the hole perpendicular to the body and press before you click. The tray will extend. Take it out and position it so you can see the contact areas. Place the nano-SIM in the appropriate recess, making sure that the cut angle matches the shape of the tray.

Put the tray back in the phone. It's important not to confuse the sides: the tray has only one correct orientation. Once the device is turned on, the network icon should appear in the notification area. If you use two cards, repeat the procedure for the second position, pre-extracting the first one.

Setting up two SIM-maps and the Internet

Xiaomi Redmi 4X You can use two SIM cards at the same time, which is convenient for splitting work and personal calls or using tariffs of different operators. However, by default, the Internet can only work through one of them. → SIM-maps and mobile networks.

In this section, you'll see a list of maps installed, and you can assign which of the sims will be used to do this. GPRS-You can also configure scripts, like always calling through. SIM 1, and mobile Internet via SIM 2.The system MIUI This allows you to flexibly manage these parameters.

One of the common problems is the lack of Internet on the second SIM card in 4G mode. In some versions of the firmware when you actively call on the first SIM, the Internet on the second one can switch to 2G or turn off. This is a feature of the modem architecture, but in most cases the Redmi 4X copes with the load stably.

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To save battery power, turn off the second SIM-If you're in a low-cost area, constantly searching for one of the cards' network can speed up battery life.

Solving Network Definition Problems

If you put the card on, the phone says, "No network" or "Emergency only," the first thing you do is check if the SIM is inserted correctly. Contacts should be clean. Wipe the gold chip with a soft dry cloth. Sometimes the oxidation of the contacts prevents the reading of the data.

The second step is to check the network settings. Make sure that the Settings menu is in place. → SIM-maps and mobile networks → The preferred network type is selected 4G (LTE). If only chosen 3G or 2G, The phone will not be able to connect to high-speed Internet, even if the tariff allows it.

In the case when the phone sees one SIM but ignores another, try rearranging them in places. If the problem persists on a particular slot, the contacts inside the phone may have become contaminated. Gently blow the slot with compressed air. PIN-code.

⚠️ Note: If the phone is requesting PUK-code after several incorrect inputs PIN, Don't guess it, three wrong inputs. PUK-The code will permanently block the SIM card, and the number can be restored only in the office of the operator with a passport.

Frequent Questions and Answers (FAQ)

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Xiaomi Redmi 4X requires strict use of the nano-SIM format. Attempts to use adapters or cards of other sizes can lead to mechanical damage to the slot, the repair of which will cost more than replacing the SIM card from the operator.