How to connect SIM-MTS card to the phone Xiaomi Redmi

The process of activating the mobile operator on Xiaomi smartphones often seems trivial, but modern devices of the Redmi line have a number of features that can confuse the inexperienced user. SIM-MTS card is the first and critical step to ensure stable, fast communication. 4G-The errors at this stage can lead not only to the lack of a signal, but also to problems with the definition of the slot or even to physical damage to the tray.

Xiaomi device owners should take into account that the MIUI operating system or its global version of HyperOS has a specific logic for managing slots. Unlike some other manufacturers, there is often a combined slot where the second tray can take either a second SIM or a memory card, but not at the same time, which is why it is important to understand the design of your particular device before you pick up a clip and plastic media with a chip.

In this article, we will discuss in detail all the stages: from the physical insertion of the card to fine-tuning the parameters of the access point for the fastest Internet. We will consider the nuances of working with nano-SIM, the features of choosing a slot for the most advanced Internet. SIM microSD and automatic and manual configuration of MTS profiles. SIM-MTS cards with support 5G You may need to have manual adjustments. APN, Because automatic settings are not always applied correctly in new firmware versions, following the instructions will help you avoid typical errors and enjoy communication from the first minutes.

Preparation of SIM-card and device tray

Before you start any manipulations, you need to make sure that you have a hand on your hands. SIM-Modern Xiaomi Redmi smartphones use only nano-SIM format, which is the smallest of the existing standards. If your MTS card is larger (micro or mini), it must be carefully broken down by perforation or, more safely, replaced in the operator’s cabin, since a neat reduction in size can damage the contact platform of the chip.

Note the state of the metal chip: it must be clean, without scratches and oxidation. Fat spots from the fingers can also cause poor contact, so it is recommended to wipe the chip with dry soft cloth before installation. The tray in Redmi devices is usually removed using a special clip included in the kit, or a thin needle. It is important to enter the tool strictly perpendicular to the hole, so as not to damage the latch mechanism inside the case.

⚠️ Warning: Never try to retrieve the tray when the phone is on if there is an active data record or system update at this time, although in most cases hot-swap is supported. It is best to manipulate the device turned off so that the system is guaranteed to correctly redistribute the resources of the radio module at the start.

The design of the tray in different Redmi models can be different. In budget models, a hybrid slot is often found, where the second compartment is divided between the second SIM and the MicroSD memory card. In more expensive models, such as the Redmi Note Pro series or the K-series, three separate slots can be installed: two for SIM cards and one independent for the memory card. Carefully examine the tray frame: it usually has a schematic image showing how to correctly orient the chip.

Physical installation SIM-MTS cards into slot

The installation process requires care and accuracy. Take a tray and find a bevelled angle that corresponds to the shape of the nano-SIM. The MTS card should lie tight, not stagger or protrude beyond the edges of the frame, otherwise when the tray is closed, it may damage or cause the contacts to short. The chip should be directed down to the contacts of the phone, unless otherwise indicated on the diagram of the tray itself.

Once the card is framed, carefully insert the tray back into the smartphone case. Make sure it enters smoothly, without excessive force. If the tray does not enter, check for orientation: trying to insert it upside down can cause the contacts inside the socket to break. Once the tray is fully installed, you can turn on the device.

When you first turn on Xiaomi will automatically try to identify a new operator. SIM-The system will ask you to give it a name (for example, "Working" or "Main") and choose the preferred actions for this number. If the phone does not see the card immediately, try carefully removing and inserting the tray again, making sure that the contacts are tightly attached.

Primary Setting and Selection of Slots in MIUI

After loading the operating system MIUI or HyperOS, you need to go to the control menu SIM-You can do this by clicking on the notification or by clicking the Settings path. → SIM-This is where you distribute roles between the installed modules, if there are two, even if you have one card, the system can request a confirmation of the slot.

You'll see a list of active SIMs in the card management menu. You can set priority actions for an MTS card, like choosing which card to use for mobile Internet by default and which card for voice calls, and this is especially true if you use MTS rates with a large packet of traffic on one card and tariffs from another operator for calls.

• 📶 Internet: Choose SIM-MTS card if you have unlimited tariff or a large package of gigabytes.
• 📞 Calls: Set a priority card for outgoing calls so you don’t manually select a number every time.
• 💬 SMS: specify the main SIM for sending messages, especially if there are no free cards on the other card. SMS.

Also in this section is available function "Use". SIM-A map for" where you can fine-tune the behavior of the device in detail, for example, you can prohibit the use of the second one. SIM to transfer data so that you don't accidentally spend traffic from the main balance, if it's unlimited on MTS. 4G", If it is not automatically activated.

Manually configuring an APN access point for the internet

It often happens that SIM-The map is defined, the signal is there, but the Internet is not working, which means that the access point is not configured. APN (Although Xiaomi tries to download settings automatically when you have Wi-Fi Internet, sometimes the MTS profile is not created or is created with errors.

To do this, go to the Settings. → SIM-maps and mobile networks → (Select the MTS map) → Access points (APN). Press the New Access Point button or the plus icon in the upper right corner, and you need to enter the exact parameters that the operator provides, and an error in even one character can lead to a lack of connection.

After you have entered all the data, be sure to click the Save button (usually in a three-dot menu or a return button). Then, in the list of access points, select the created "MTS Internet profile" by placing a marker next to it. Without this step, the phone will continue to use the old, non-working profile.

⚠️ Attention: When manually adjusted APN You need to type in mts in small letters in the username and password field for MTS. MTS Capital letters is a common error that causes the network to not authorize the device.

Solving problems with network registration and signal

If after all the settings, the phone says "No network" or "Only emergency calls," the problem may be deeper. SIM-In order to do this, insert it into another phone, if there is no network, it may not be activated (if it is new) or blocked by the operator, and if a new MTS SIM requires you to make the first call or refill the balance to activate it.

Xiaomi has a "Preferred Network Type" feature in its settings. Make sure you select LTE or 5G/LTE/3G/2G (auto). If you only choose 4G and only 3G is available in your MTS coverage area, the phone won't be able to register. Also try switching network mode to 2G Only to see if the signal shows up at all - this will help diagnose the problem with the communication module.

Another cause of problems may be an outdated version of the radio module’s basic data: Make sure your Redmi is updated to the latest available firmware. Operators regularly update frequencies, and older versions of the software may not work properly with new MTS towers, especially in Carrier Aggregation mode.

Use of VoLTE and VoWiFi functions from MTS

Modern Xiaomi smartphones support VoLTE (Voice over LTE) and VoWiFi (Voice over Wi-Fi) technologies, which allow high-quality calls over 4G and Wi-Fi networks respectively. MTS is actively implementing these technologies. To activate VoLTE, the service must be connected on the operator side (often free or on request) and supported by a tariff.

Setting up VoLTE on Redmi usually happens automatically after installation. SIM-MTS cards, if the phone is certified to work in the operator's networks, the status bar should show an icon"HD" Or "VoLTE." If there's no icon, check settings: Settings. → SIM-maps and mobile networks → (Yours. SIM) → Use VoLTE. The switch must be active.

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To activate VoWiFi on Xiaomi, you sometimes need to enter a special code in the call: ##86583##. After entering the code, the message “VoWiFi Carrier check was disabled” will appear, which means unlocking the ability to enable the feature in the settings.

VoWiFi is especially useful in areas with poor cellular signal but good Wi-Fi. To work with your phone, you need to find Wi-Fi Calls and turn it on. Make sure that in the My MTS app or in your personal account, this option is also activated for your number.

Security and cost management

Once connected successfully, it is important to set up security to avoid unexpected costs. Xiaomi smartphones have a built-in "Security" tool that allows you to set a traffic limit. → Transfer of data → Statistics and set a limit for SIM-MTS cards according to your tariff plan.

It is also recommended to disable data transfer in roaming if you travel frequently to avoid charging for the background work of applications abroad. → SIM-maps and mobile networks → Data roaming. Even if you don't plan to leave, this setup is a good preventive measure.

• 🔒 PIN: Set the request PIN-code when turning on the phone in the "Protection" section SIM-“Cards” so that no one can use your SIM on another device.
• 📉 Background traffic: limit background data transfer for heavy applications in the "Traffic Control" menu".
• 📵 Flight mode: Use quick setup in the notification curtain if you need to temporarily turn off all communication modules to save charge.