Modern Xiaomi smartphones allow you to use two SIM cards at the same time, which creates certain difficulties in managing. Users often wonder how to configure the device so that calls are received from one card and the Internet works through another. The shell of MIUI and the new HyperOS has a flexible switching mechanism that requires the correct initial configuration.
Incorrect selection of the priority slot can lead to unexpected expenses on mobile traffic or missed important calls. Android system based on Xiaomi by default can activate the Internet on the same card with which the first call was made, which is not always convenient. Understanding the logic of the dispatcher SIM-The cards will help to avoid unnecessary costs and inconvenience in everyday use.
In this article, we will explore all the nuances of network configuration, including hidden settings and the peculiarities of working with 4G/5G networks. You will learn to quickly change priorities through the notification panel and understand why in some cases the system itself switches communication modes.
Basic setting of priorities SIM-map
The initial configuration usually occurs immediately after the cards are placed in the tray and the smartphone is turned on. The system automatically detects new modules and suggests adjusting their basic parameters. However, automatic settings do not always meet the user's needs, so manual verification is preferable.
To access the main control menu, you need to go to Settings, which is the central control center for all the device parameters, and depending on the firmware version, this item may be called differently, but the logic remains the same for all Redmi and Mi models.
Find a point. SIM-This is where all the voice and data controls are concentrated, and this is where the interface in this section is intuitive, and it's divided into two main speakers or blocks that correspond to the physical slots of the device.
At the top of the screen, you'll see switches to activate each card, and if one of them is temporarily unused, like when traveling abroad, it can be turned off software without physically removing it, which is useful for saving battery life, as the communication module stops looking for the network.
⚠️ Note: When the second is disconnected SIM-cards in the settings, incoming calls to this number will not arrive, and the subscriber will hear the signal "occupied" or "subscriber is unavailable".
Here are the default card choices, and these are the two main options: Calls and Mobile Internet. You can assign SIM 1 to voice and SIM 2 to surf the web, or vice versa. This flexibility allows you to optimize costs by using the tariffs of different operators most efficiently.
Internet traffic and data transmission management
The most important aspect of setting up is mobile traffic control, and a mistake in choosing a map for the Internet can lead to rapid packet exhaustion or connection of paid options. Xiaomi has a Traffic Limit feature that helps control the consumption of megabytes.
When you activate the mobile Internet on the selected map, the system can offer to enable the function "Internet Acceleration". SIM-maps simultaneously to increase download speeds, but this is only true if there are unlimited rates on both numbers.
To switch the data source on the fly, you don't have to go deep every time, you just have to pull down the notification curtain and find the mobile Internet icon, and if you press it long enough or use a special widget, you can instantly change the priority card.
- 📶 Auto Switching: A smartphone can choose the network with the best signal if the appropriate option is enabled in advanced settings.
- 💾 Traffic savings: In the settings of each SIM There is a "Traffic Limit" item where you can set a monthly limit and a date for resetting.
- 🚀 5G Preferences: Network Selection Menu can be forced to prioritize 5G, If your model and operator support this standard.
If you select a card without this technology for calls, the phone can temporarily switch to 3G or 2G during a call, interrupting high-speed internet on the second card unless Dual SIM Dual Standby (DSDS) mode is enabled.
💡
Use the SIM Switch widget on your desktop to instantly change your Internet map with one touch, without going into the settings.
Configuring voice calls and VoLTE
The quality of voice communication depends on the correctness of the selected SIM-Default call cards: You can set up a single card for all outgoing calls in the settings menu, or leave a request every time, the latter option is convenient if you actively use both numbers for different purposes (work, personal).
VoLTE Technology (Voice over) LTE) It's becoming the standard for today's carriers, and it allows you to have a high-quality conversation while using fast Internet. On Xiaomi, it's included in the same menu. SIM-maps and mobile networks.
If after activating the VoLTE icon HD If you do not appear in the status bar, check if your tariff supports this service. USSD-command.
| Parameter | Description | Recommendation |
|---|---|---|
| Default calls | Map for outgoing calls | Choose the main or "Always ask" |
| Mobile Internet | Data map | Map with a large packet of traffic |
| SMS default | Message map | Main number |
| Preferred type of network | Communication standard (2G/3G/4G/5G) | Preferably LTE/5G |
In some cases, especially when using the old SIM-If you notice a connection problem, try replacing it. SIM-card to a new one from the operator or temporarily disable the function in the settings.
Secret codes for status verification
Advanced settings and engineering menu
For power users, Xiaomi provides access to advanced network settings that allow you to fine-tune the behavior of the model in the face of poor reception or specific network requirements. Be careful when changing these settings, as incorrect values can lead to loss of communication.
To get into the network selection menu, go to Settings path → SIM-maps and mobile networks → Choose. SIM-map → The preferred type of network is available here from "Only" 2G" before "Preferred" 5G". Selection of the “Only” regime 2G" It can be useful for maximum charge savings in the area of confident reception, but the Internet speed will be extremely low.
There is also a hidden engineering menu available through dialing, enter the code ##4636## in the call, and a test menu will open, where in the Phone Information section you can see the signal level in dBm, the network type, and switch the preferred mode of the radio module.
- 🔧 Network Reset: If there are persistent crashes, use the Network Reset function in the Connections and Sharing menu".
- 📡 Data roaming: Only enable this item when traveling abroad to avoid hefty bills.
- 🔍 Network Search: Manually select a specific operator if the automatic selection is not working properly.
⚠️ Warning: Changing the settings in the engineering menu (#4636###) can cause your smartphone to work in an unstable way%.
☑️ Checking network settings
Solving definition problems SIM-map
Often, users are faced with a situation where the smartphone stops seeing one of the cards or constantly requests a PIN. In most cases, the problem lies in a physical contact or a software failure of the communication module. The first step should always be to restart the device.
If the reboot didn't help, remove the tray and wipe the contacts SIM-Soft material on the cards. Contact oxidation is a common cause of unstable work. Also make sure the card is in the correct orientation, according to the tray pattern.
In the software part, it is worth checking whether there is a call lock or background activity restriction for system processes responsible for communication, sometimes antivirus or "cleaners" can aggressively close the telephony processes.
If the problem persists, try installing the card in another slot, which will help determine if the card itself is faulty. SIM-card or damaged a particular slot in the smartphone. In case of damage to the slot will require repair in the service center.
💡
If the phone can't see SIM-card after cleaning contacts and rebooting, check the card in another device - it may have physically failed.
Features of working with eSIM on Xiaomi
Xiaomi’s current flagship models are increasingly supporting eSIM technology.It’s a built-in digital module that allows you to activate a tariff without a physical plastic card. eSIM management takes place in the same menu. SIM-maps and mobile networks.
To add eSIM, you will need to QR-Operator code. From the settings menu, select Add Plan and scan the code with the camera. Once you upload the profile, the virtual card will appear in the list of options available to you.
The advantage of eSIM is that it can store multiple profiles and switch between them quickly, but only two lines are active at the same time (for example, one physical and one eSIM, or two eSIMs, if the model allows).
When choosing SIM contacts to work with eSIM, the same priority rules apply, and you can assign a virtual card to the main one for the Internet, which is especially convenient when using travel rates on trips.