What? SIM-The card is needed for Xiaomi Redmi 4X: thorough

Owners of the legendary Xiaomi Redmi 4X budget smartphone often face the need to replace or install a SIM card, especially given that the model is no longer new and communication standards are evolving. The question of which SIM is suitable for this device is fundamental, since using the wrong size card can damage the slot or the communication module itself. Unlike today's flagships, where often only one physical card and eSIM are used, this gadget requires a classic physical medium of a certain format.

The device was released at a time when the industry had finally moved to miniature standards, abandoning the bulky plastic cards of the past.The Redmi 4X supports exclusively the Nano-SIM format, which is the smallest of the common physical standards to date. Trying to insert a larger card, even with mechanical trimming with scissors without a special adapter, carries real risks of damaging the contact group inside the phone.

In addition, support for networks is an important aspect, since this smartphone works in 4G LTE bands, which requires the SIM card to register with the operator. If your SIM card was released more than 7-8 years ago, it may not support high-speed data protocols, even if it is physically fit in size.

Technical characteristics of the slot and types of supported cards

The Xiaomi Redmi 4X SIM connector is Nano-SIM, which is 4FF (Fourth Form Factor) specification, and is only 12.3×8.8mm in size, making it extremely compact and demanding for installation accuracy. The device tray is combined, meaning that two SIM cards or one SIM card and a microSD card can be installed, but not all elements at the same time in full.

It is important to note that the slot does not support old Mini-SIM or Micro-SIM cards without the use of special adapter frames, which, however, are not recommended for permanent use due to the risk of getting stuck.The tray extraction mechanism is hidden inside the case and is activated only when pressed with a special key coming in the kit or a thin needle.This provides tight fit of contacts and protection from moisture and dust.

Technically speaking, the power and communication controller at Redmi 4X designed for voltages of 1.8V and 3.0V, which is standard for modern SIM-The use of adapters can lead to an increase in the thickness of the map, which will create excessive pressure on the contacts of the reader when closing the tray.

Instructions for extraction and installation of Nano-SIM

The process of replacing the card in Xiaomi Redmi 4X requires care, since the tray is located on the top end of the device. First, you need to find a small circular hole next to the rectangular compartment. Take a metal clip or a special key from the kit and carefully, but with a confident press, insert it into the hole perpendicular to the case.

Once the tray pops out, remove it completely. Pay attention to the shape of the notches: they clearly repeat the outlines of the Nano-SIM. Make sure that the notches on the plastic-based card match the protrusions in the tray. Incorrectly orientation the chip (contacts up or down) will not close the tray and can damage the contacts.

Insert the card into the appropriate cell. If you use only one SIM card, it is preferable to use the SIM 1 slot, as it often takes priority for mobile Internet in some versions of the MIUI firmware. Once installed, gently press the tray back into the case until the characteristic click or complete disappearance of the frame in level with the case.

⚠️ Warning: Never try to force a tray unless it comes in. SIM-The card is installed incorrectly or skewed, and further pressure will cause the mechanism to break down.

Setting up two SIM-mapping and network management

Xiaomi Redmi 4X supports two SIM cards simultaneously, allowing the user to flexibly manage calls and mobile Internet. Once the cards are physically installed and the phone is turned on, MIUI automatically determines new modules. However, to work correctly in Dual SIM mode, you need to properly set priorities in the device menu.

Go to the settings section by selecting Settings, then two SIM-And you'll see both slots here, and you can individually choose your preferred type of network for each of them (2G, 3G, 4G) or leave the value preferably LTE. This is especially important if one of the operators has a weak coverage in your area.

• 📞 Voice calls: You can assign a master card for all calls or ask each time you dial a number.
• 🌐 Mobile Internet: only one slot for data transfer can be active, the second one will work in the mode 2G/3G call-in.
• 💬 SMS-Messages: By default, they are sent from the main card, but when writing a new message, you can choose the sender.

It should be borne in mind that when you actively talk on the first SIM card, the second one may temporarily become unavailable if it does not support VoLTE technology or is in the coverage area only. 2G. In the settings, it is also recommended to activate the function HD-call, if your operator and tariff plan allow, to improve sound quality.

Problems with SIM-card definition and their solution

It is not uncommon for users to experience a situation where the Xiaomi Redmi 4X stops seeing the SIM card by displaying a crossed-out card icon or saying "No SIM." This can be caused by contact oxidation, software failure or mechanical damage. The first step should always be to restart the device, as this updates the modem drivers.

If the reboot didn't work, remove the tray and carefully examine the golden contacts on the card itself and inside the phone.The presence of dust, pile or oxides can interfere with the connection. Gently wipe the chip with dry lilaless cloth or eraser (very carefully). Also try to move the SIM card to another slot to rule out a malfunction of a particular reader.

In some cases, the problem lies in the card itself, which may have demagnetized or worn out physically. If the card is very old, you should contact the salon for a free replacement with a new Nano-SIM with a saving number, which often solves problems with unstable signal.

Configuring APN access points for mobile Internet

Even if the SIM card is correctly defined, mobile Internet may not work without the correct settings of APN access points. In Xiaomi Redmi 4X, these settings usually come automatically as an SMS from the operator when the card is first installed.

To do this, go to the Settings menu. → Two. SIM-maps and mobile networks → select the right slot → Access points (APN). Click the menu button at the bottom of the screen or plus to add a new dot. Data to fill out (name, APN, login, password) can be found on the official website of your mobile operator.

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When entering APN, use lowercase letters only, unless the operator has indicated otherwise. Letter registers may be relevant for some providers, such as MTS or Beeline.

After you enter all the parameters, be sure to save the profile and select it by ticking it. Without saving the settings will not apply, and the Internet will not work. If the Internet does not work immediately, turn on and off the Reim flight to re-register.

⚠️ Warning: Do not remove standard preset access points, even if you do not use them, they may be necessary when resetting or changing the operator, and it is difficult to restore them manually.

Questions and answers SIM-maps at Redmi 4X

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Proper Nano-SIM installation and APN setup are key factors in stable communication in Xiaomi Redmi 4X.