How to switch SIM to Xiaomi: full network settings

Owners of smartphones brand Xiaomi, Redmi and Poco often face the need to change the parameters of work SIM-This can be caused by moving to an area with unstable coverage, a desire to save traffic or a desire to move the Wi-Fi hotspot. MIUI HyperOS provides flexible tools for managing communication modules, but standard settings are not always obvious to the average user.

Switching a SIM to Xiaomi can mean several different actions: changing the priority modem for the Internet, forced switching to 2G mode to save charge, or changing the APN access point. In this article, we will discuss all possible scenarios that will help you set up communication as efficiently as possible. It is important to understand that improper settings can lead to a temporary lack of communication, so follow the instructions carefully.

Before you make changes to system settings, make sure your SIM-The card is functional and active. Sometimes the problem is not the software settings, but the physical contact or the account balance. We'll look at both the standard methods through the settings menu and the more advanced methods through the engineering menu.

Basic settings of the preferred network type

The easiest way to switch the SIM to Xiaomi from 4G to 3G or vice versa is through the main settings menu, which is suitable for most situations where you need to change the standard of operation of the radio module, the system allows you to flexibly manage priorities for each of the installed cards.

To access these parameters, you need to go to the Settings section, then select the item SIM-And you'll see a list of maps installed here, and if you click on the SIM, you'll be taken to the menu of the individual settings. That's where the key switch is.

• 📶 Prefer LTE: Standard mode for most users, providing maximum speed.
• 📶 Prefer 3G: useful in areas of weak reception 4G, Where the phone is constantly jumping between standards.
• 📶 Only 2G: mode for maximum saving of charge or calls in conditions of extremely poor communication.

Choosing 2G Only (GSM) mode often helps extend the device’s life by many times if the smartphone is used as a bell or navigator in the car, but it is worth remembering that in this mode mobile Internet will not work or will be extremely slow.

⚠️ Note: When switching to "Only" mode 2G» You may temporarily lose voice communication if your carrier has already disabled support for the standard. GSM in your region.

Configure APN access points for the Internet

Often users are looking for a way to switch the SIM to Xiaomi, meaning that you can configure the correct Internet access. If mobile data is turned on but the pages are not loading, the problem is often the incorrect APN (Access Point Name) settings, which automatically come in the form of an SMS from the operator, but sometimes you need to write them manually.

To check or change the settings, go to the Settings path. → SIM-maps and mobile networks → pick your SIM. → Access points (APN). In the list that opens, you can create a new point or edit an existing one.

Once you have entered all the options, be sure to click the "More" button (three dots in the corner) and select "Save." Then activate the created access point by placing a marker next to it, and without saving the changes, the Internet will not work even if all the data is entered correctly.

⚠️ Warning: Never delete standard access points created by the system. Better create a new record with your parameters, so that in case of an error you can simply roll back.

Managing two-symbol devices

Xiaomi’s modern smartphones support the work of two SIM-The user must clearly define which card will be used for voice communication and which for data communication. This is especially true when there are tariffs with different traffic volumes.

On the menu. SIM-There's a section called Use for calls and Use for mobile Internet, you can choose a specific SIM for each feature, or you can leave Always Ask mode, which is convenient if you change operators often depending on the location.

Also worth noting is the Calling Data Transfer feature, which means that if you lose Internet on the second SIM during a conversation, you need to activate this feature, which allows you to keep the data flowing on the non-conversation map without using the resources of both communication lines.

Using the Engineering Menu for Deep Customization

For advanced users who don't have enough standard settings, there's an engineering menu, which is a hidden part of the system that allows you to control the radio module at a low level, and you can forcibly switch the Xiaomi SIM to a mode that is not available through the regular menu, for example, to fix a specific frequency.

To enter the menu, you need to open the Phone app and dial the combination ##4636##. If the code does not work, your firmware may block this access, and you will need to install a special application from the Google Play store, such as Force LTE Only.

From the menu that opens, select Phone Information. Go to Set Preferred Network Type. Here's a long list of options. For 4G, force LTE Only, for 3G, WCDMA Only.

Important: After resetting or rebooting the phone, the parameters in the engineering menu can return to factory values. This is normal security behavior.

Problems with the definition of the second SIM card

Sometimes users are faced with a situation where the phone stops seeing the second SIM after updating or falling, in which case the question of “how to switch the SIM” is transformed into “how to make the phone see the map.” The first step should always be a software reboot of the communication module.

Try turning off the second SIM in the settings, wait 10 seconds and turn it on again. If that doesn't work, go to About Phone and quickly click on the Kernel Version or MIUI Version several times to check if the system interface is getting stuck, and the 15-20 second flight mode also helps.

• 🔧 Check the cleanliness of the contacts on the SIM-map, wiped them with a swallow.
• 🔧 Make sure the card is properly installed in the tray according to the scheme on the tray itself.
• 🔧 Try to move the SIMs to other slots (Slot 1) ↔ Slot 2).

Wi-Fi Access Point Transfer and Modem Modem

Another aspect of switching the SIM is using your smartphone as a router, Wi-Fi Access Point allows you to distribute mobile Internet to other devices, and Xiaomi's settings allow you to choose which SIM card will be the source of traffic.

Go to Settings → Wi-Fi Access Point. In the Settings of the Access Point or in the top menu (depending on the OS version), there is a paragraph Use the Mobile Network. Here you choose SIM 1 or SIM 2. This is critical if one card has run out of traffic and the other has unlimited.

⚠️ Warning: When you actively distribute Wi-Fi, the smartphone can get very hot. It is recommended to remove the case and not cover the device with a cloth while operating in modem modem.

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Use the 5GHz band for the access point if the receiving device supports this standard, which will reduce interference and increase data transfer speed.

Resetting network settings as a universal solution

If no methods help and you don’t know how to switch the SIM to Xiaomi due to system errors, a complete reset of network settings will help.This operation does not affect your personal files, photos or contacts, but will delete saved Wi-Fi passwords and Bluetooth pairs.

You can find this feature along the way: Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Press Reset button at the bottom of the screen. After the reboot, the phone will again request settings from the operator, which often solves problems with registration on the network.

Once reset, the system will automatically determine the optimal settings for your region and operator, and this is the safest way to correct configuration errors accumulated during the device’s use.

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Network resets are a secure procedure that often solves 90% of problems with unstable communications and the Internet without losing personal data.

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