How to switch the Internet from one SIM to another on Xiaomi Mi 9

Modern smartphones like the Xiaomi Mi 9 are often used in two-activity mode. SIM-It's a card that allows you to separate your business and your personal calls, or to use the tariffs of different operators to save money. MIUI This is especially true in areas of unstable coverage, when one operator stops “catching” the network, and another provides a confident signal.

The process of switching an access point to transfer data does not require complex manipulations or root rights, but knowing the exact algorithm of actions helps save time. SIM-We'll look at the hidden settings of the engineering menu and analyze the reasons why your phone might ignore your commands.

It's worth noting that MIUI has its own features that set it apart from pure Android. The logic of the communication modules here is designed to minimize battery life, but sometimes it leads to delays in switching. We'll look at how to get around these limitations and configure the device as efficiently as possible for your needs.

Basic priority setting SIM-card MIUI

First, you need to understand the main SIM card management menu, which is the central node for setting up communication. In Xiaomi Mi 9, these options are accessed through the standard system settings application. Open the menu and find the section responsible for wireless networks, which is usually called «SIM-maps and mobile networks».

Inside this section, you'll see a list of installed cards with their names and carrier logos, and here's the Use key switch. SIM-It's this choice that dictates to the system which channel to send and receive packets of information when Wi-Fi is disabled.

It’s important to understand the difference between voice calls and Internet traffic, so you can assign one card (like the one that’s cheaper than a minute) to the Internet and another card (where there are more gigabytes or higher 4G/5G speeds), and the flexibility of the setup allows you to optimize your costs without having to physically rearrange plastic media.

⚠️ Attention: After shift SIM-The mobile network may be interrupted for a short time, which is normal behavior of a communication module that re-registers in the network of a new operator.

If you use the Quick Access feature, make sure that the appropriate widget is activated in the notification curtain. Sometimes users change the settings in the depth of the menu, forgetting that the old status is left in the curtain, which causes confusion when visually monitoring the network status.

Using a Quick Access Panel to Change Networks

To quickly switch the Internet in Xiaomi Mi 9, it is much more convenient to use the control panel hidden behind the notification curtain, which allows you to change the source of traffic in a couple of seconds without getting into the wilds of system settings. Just swipe down the screen from top to bottom to reveal the full list of icons.

Find an icon that displays the current type of network (for example, 4G, LTE or 5G) numbered SIM-- Depending on the version. MIUI, Clicking on this icon can either switch the map right away or open the selection mini menu. In some design themes, this element may be hidden, so check the control panel settings.

If the standard widget doesn't show you the choice, try pinching the mobile Internet icon itself. This action often opens a context menu with advanced options. Here you can not only change the SIM, but also quickly turn on flight mode or activate data roaming if you are abroad.

Using a quick access panel is especially important when you move between different coverage locations, for example, when you leave an office where one operator catches well and get into a transport where the signal of another is more confident, you can instantly adapt the phone settings to the current conditions.

Setting up intelligent switching of network modes

Shell MIUI It offers features that attempt to automate the process of choosing the best network, but their work is not always predictable. SIM-There's often a smart choice of network or similar wording, and this is designed to automatically switch between the two. 4G and 3G/2G depending on the quality of the signal.

But for manual priority control between two SIM cards, automation can be useless or even harmful. The system may try to keep a weak signal on a map assigned to the Internet, rather than allowing you to manually switch to a more stable second card.

In Xiaomi Mi 9, you should also pay attention to the settings of the preferred network type. Going to the Preferred Network Type menu, you can force the Preferred LTE mode. This will prevent unwanted network rollback to EDGE or 3G if the 4G signal becomes unstable, although the speed may drop, but the connection will not break completely.

Keep in mind that activating certain modes can affect power consumption. Constant network search in areas of uncertain reception makes the Xiaomi Mi 9 modem run at its limit, which quickly puts the battery down. If you know that you are in a low coverage area, sometimes it makes sense to manually switch the Internet to the SIM where the signal is stable, or turn off data transmission altogether.

Solving Data Transfer Problems After Switching

There are times when you switch the internet to another. SIM-map, but icon 4G/LTE It didn't appear, or it didn't load, and the first and most common reason is that there were no configured access points. APN Unlike the basic settings, which are often automatically adjusted, the profile may not be set for the second SIM.

To correct the situation, you need to go to the settings of the selected SIM-maps and find the "Access Points" item (APN)». If the list is empty or the settings are incorrect, click the Add New Point or Reset button to the factory settings. Usually, just click the menu button (three dots or the More button) and select Reset Settings».

⚠️ Note: Do not create access points manually unless you know the exact parameters of your operator. An error in one symbol of the address or port will cause the Internet to fail, even if there is a signal on the network.

Another common problem is blocking system-level data after a change in priority, and sometimes Android sticks in a standby state, in which case it helps to turn on the flight mode for a short time, activate it for 10-15 seconds, and then turn it off, which will force the radio module to restart and initiate a new registration on the network with updated parameters.

If that doesn’t work, check if the traffic limit on the selected card is exhausted. MIUI has a built-in traffic limiter that can automatically turn off the Internet when you reach a given threshold. Check the settings in Security → Data Transfer → Statistics to make sure the limits do not block the connection.

Engineering menu and fine modem setting

For advanced users, the Xiaomi Mi 9 has an engineering menu that provides more detailed information about the network status and even forced changes to some of the radio module parameters, a powerful tool that requires caution, and is logged in through a set of special code in the Phone app.

Dial the code ##4636##. If the code doesn't work (in some regions or versions) MIUI It's locked, you can use Activity Launcher to find Testing activity. From the menu that opens, select Phone Information. Here you'll see detailed statistics on each of the two. SIM-map.

In this menu, you can forcibly switch the network mode, for example, prohibit 3G leave only LTE, However, changing the parameters in the engineering menu on Xiaomi Mi 9 This feature can lead to total network destruction if you choose an incompatible standard. Use this feature only if you understand what each parameter is responsible for (for example, the difference between the two parameters). LTE Only and NR/LTE).

Also in this section, you can see the actual signal power in dBm, which is much more informative than the sticks in the status bar. A value closer to 0 (for example, -80 dBm) means a great signal, and values below -110 dBm indicate extremely poor reception. By comparing these figures for both SIMs, you can objectively decide which card is more profitable for the Internet at the moment.

Optimizing the two SIMs to save power

Use of two active SIM-maps, especially in networks 4G, The Xiaomi Mi 9 has a significant impact on the autonomy of the device, and the communication module has to constantly communicate with two base stations at the same time. To minimize energy consumption with frequent Internet switching, you should use standby mode.

If you don’t need the internet on the second card right now, it’s best to turn off data transmission for it completely, leaving only voice calls and voice calls active. SMS. This will prevent background data exchange that some apps can produce and reduce the strain on the phone's processor. SIM.

It is also recommended to disable the Boot Speed feature if it is active, which allows you to use Wi-Fi and mobile Internet simultaneously to increase speed, and while it is convenient, the constant activity of both communication modules leads to increased body heat and fast battery discharge.

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For maximum nighttime charge savings, turn on Do Not Disturb mode and turn off mobile data on both SIM cards if you are in a stable Wi-Fi zone.

Compliance with these simple rules will help to extend the life of your device without recharging. Optimizing network settings is not only a matter of convenience, but also a way to keep your smartphone battery healthy for years to come.

Frequently Asked Questions (FAQ)

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Correct setting of priorities SIM-mapping and understanding APN Allows you to fully control mobile traffic and avoid unnecessary costs on Xiaomi Mi 9.