How to set up correctly SIM-Xiaomi maps: from installation to installation 5G

Modern Xiaomi smartphones have long ceased to be just devices for calls, becoming powerful multimedia centers, but the basic function of mobile communication remains critical for each user. SIM-card-on-shell MIUI HyperOS often requires attention to detail, especially when it comes to running two numbers simultaneously on networks. 4G and 5G. Many owners face situations where the second slot only works in mode. 2G/3G, or the Internet switches chaotically, which significantly reduces the comfort of the gadget.

In this article, we will take a look at the process, from the physical installation of the chip in the tray to the subtle software configuration of preferred networks and access point names. You will learn how to make Xiaomi Redmi or POCO stable to the network, avoid common errors when activating VoLTE and optimize battery consumption when operating communication modules. Understanding these nuances will allow you to squeeze the maximum of the capabilities of your smartphone without the need to flash or contact a service center.

Before you go to software settings, you need to make sure that the physical installation of the communication module is correct, since software failures are often the result of poor contact. Modern flagships and mid-segment devices use combined trays, where the second slot can share with a microSD memory card, which imposes its limitations on the choice of storage and communication configuration.

Physical installation and definition of slots

The process begins with the removal of the tray for SIM-It's important to press strictly perpendicularly into the hole next to the tray, avoiding distortions that could damage the pull-out mechanism or the motherboard's internal contacts. On most Xiaomi models, the tray has a specific shape that excludes improper installation of the card, but the force is not needed here - if the card does not enter easily, then it is located incorrectly.

Note the slot numbering, which is often indicated in fine print on the tray frame or on the inside of the smartphone case after removing the module. SIM 1 slot is traditionally a priority for connecting to high-speed 4G/LTE and 5G networks, whereas the second slot in some budget models may have bandwidth restrictions. If you plan to use one card exclusively for high-speed Internet, and the second only for voice calls, it makes more sense to place the main card in the first connector.

⚠️ Note: Before installing a new one SIM-Make sure it is the correct size (Nano-SIM) using adapters or cutting the card with scissors can lead to the chip getting stuck in the tray and damage to the contact group of the smartphone.

Once the device is physically installed and turned on, the system will automatically try to read the data from the chip and register with the operator's network. SIM-card, try to gently wipe the contacts of the chip with a soft dry cloth, as oxidation or greasy fingerprints often cause signal loss.

Basic preference setting SIM-map

After successful registration in the network, the user is opened to the two-number management interface, which in the shell MIUI It's pretty flexible. You need to go to the Settings menu to access the basic settings. → SIM-maps and mobile networks, which displays the connection status of both numbers and signal level, and this is where the logic of the device for incoming calls and mobile traffic is set.

The first step is to determine the default card for voice calls and SMS-The system allows you to select a permanent number for all outgoing actions or request a choice each time you dial, which is convenient for those who share personal and work contacts. SIM, And that's where all the applications that require a connection will work if Wi-Fi isn't enabled.

• 📱 Default calls: Select the main SIM or Always Ask mode for flexible management.
• 🌐 Mobile Internet: assign a card with the most profitable tariff plan for data packets.
• 💬 SMS By default: we set the number from which messages are sent most often (for example, for bank codes).
• 📞 Access. 3G/4G: activate the switch for the second SIM, if you need simultaneous Internet access from both numbers (not available on all models).

An important aspect is to set up the display of operator names and color tags, which helps to visually distinguish between SIM cards in the dialing interface and call log. You can assign each card a different name (for example, "Work", "Personal", "Travel") and select a color indicator that will highlight the status of the active network at the top of the screen.

Setting up mobile internet and APN

In most cases, modern Xiaomi smartphones automatically load the necessary access point (APN) settings immediately after a new carrier is discovered. However, if the Internet does not work or the connection speed is unstable, manual verification and adjustment of these settings are required, since the automatic configuration sometimes fails or uses outdated protocols.

For manual settings go to the menu of the selected SIM-maps and find the "Access Point Names" item (APN)". Here you will see a list of available profiles; if the list is empty or the current profile is not working, you need to create a new access point by entering the data provided by your operator. APN security protocols, as a single error letter can block access to the network 4G.

After making changes, be sure to save the new profile and activate it by ticking the appropriate "check." If the Internet does not appear immediately, it is recommended to turn on the flight mode for 10 seconds, and then turn it off so that the communication module restarts with the new parameters.

Managing 4G, 5G and VoLTE networks

One of the most common problems of Xiaomi users is the inability to simultaneously use high-speed Internet on one SIM and take voice calls on the second without switching to 2G/3G. The solution lies in the correct activation of VoLTE technology (Voice over LTE), which allows voice to be transmitted as a data stream on a 4G network, freeing the second slot to work in 4G standby mode.

To enable this function, go to the settings of each SIM-If the operator supports this technology in your region, a corresponding icon will appear next to the network indicator. Activation of VoLTE not only improves the sound quality by making it easier for the user to use VoLTE. HD, But it allows you to stay online. LTE during a conversation, which is critical for navigation and messengers.

⚠️ Note: If you don’t see a VoLTE switch in the standard menu, it doesn’t always mean it’s not there. In some regions (e.g. Russia, India), this option may be hidden by default and activated via an engineering menu or special codes that depend on the firmware version (Global, China, EEA).

Also, the "Preferred Network Type" menu recommends a combination mode, such as "LTE Preferred" mode. Do not lock the phone to 5G only if coverage in your area is unstable, as the constant search for a higher network will lead to a quick battery discharge and heat the device.

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To force VoLTE on hidden models, try entering the number menu with the code ##86583##. You will see the message "VoLTE Carrier check was disabled", which means unlocking the function in the settings menu. Re-entering the code will return everything back.

Solving the Problems of Defining a Second SIM

A situation where the smartphone stops seeing the second SIM card can occur after a system update or mechanical impact. Before carrying the device into the service, it is worth performing a number of software actions that often restore the functionality of the second slot without losing data.

First, reset your network settings, which will return all modem settings to factory values, but will not affect your personal files, contacts or applications. To do this, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile Internet and Bluetooth and confirm the operation. After the restart, the phone will re-interview both slots.

• 🔄 Slot change: Change the slots SIM-If the problem goes with the card, it's the chip or the contacts, and if the problem is on the same slot, there's a hardware defect in the phone.
• 🛠️ Baseband Update: Check for system updates in the About Phone menu, as patches often contain patches for specific operators' modems.
• 🔧 Format check: Make sure the card is not old (3G-only) and maintain standards LTE, Which are required by modern Xiaomi smartphones for stable operation.

If the software methods fail and the phone flatly refuses to see the second card, the tray itself or the connection plume may be damaged, in which case the use of the second SIM becomes impossible before hardware repairs are carried out.

Optimizing battery consumption and safety

Use of two active SIM-The transmission system, especially in areas of unstable reception, significantly increases energy consumption, as the communication module has to constantly maintain a connection with two different base stations. To minimize the impact on autonomy, it is recommended to turn off the second SIM card at night or in places where there is no coverage of any of the operators.

In the energy saving settings, you can find options that limit background activity for applications using the mobile network, you can also turn off the Always On Display function or reduce the frequency of network surveys if you are on roaming, where charging can be hourly.

From a security perspective, when using two numbers, it is important to monitor application permissions to access SMS and call log. Some malware may try to read confirmation codes from the main SIM card while you are distracted by a call from a working one, so regular audit of installed applications and the presence of an antivirus is mandatory.

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Two active SIM-map-mode 4G They can increase the battery consumption to 15-20% per day compared to using a single number, especially in low signal conditions.