A modern smartphone like the Xiaomi Redmi 9 is impossible to imagine without constant access to the global network. Users often face a situation where after installing a new SIM card or resetting, access to data is not automatically activated, which can be annoying, especially if you need to urgently use a navigator or messenger.
Owners of MIUI-based devices know that the settings menu is specific here. Sometimes standard switches are hidden in the submenus, and sometimes the problem lies in the wrong access points. In this article, we will discuss in detail all possible ways to activate data transfer.
We're going to look at not only the basic steps, but also the complex cases that require manual adjustment of the operator's parameters. It's critical to enter the APN settings correctly for your carrier, as they are responsible for routing traffic. Follow the instructions carefully to avoid errors.
Basic activation through the notification panel
The fastest way to start the Internet is to use a notification curtain, which is suitable for situations where the settings are already correct, but the data transfer was simply turned off by the user to save charge.
Swipe down from the top of the screen to open the control center, find an icon with two arrows or a "Mobile Data" caption and click on it, and if the indicator lights up in blue or green, the module is activated.
However, if the icon is on but the sites are not loaded, the problem may be deeper, in which case you need to check which SIM card is selected for data transfer, especially if the device has two cards.
⚠️ Note: If after the slider is turned on, the icon 4G or LTE not appearing in the status bar, perhaps in your coverage area a weak signal or SIM card is not defined by the system.
Sometimes it helps to reboot the interface, so try to turn on the flight mode for 10 seconds, and then turn it off, and this will force the modem to re-register on the operator's network.
Setting up an APN access point for operators
If the basic methods didn’t work, it’s likely that the phone doesn’t have or isn’t setting the APN hotspot settings correctly, which is the technical data that the SIM card tells the device to access the network.
For manual settings go to Settings → SIM-Maps and mobile networks. Select an active SIM card and click on "Access Points (APN)». At the bottom of the screen is often a button “Reset” or “New access point».
It is recommended to try to reset the settings to the factory first by pressing the corresponding button in the menu, the system will pull up the current parameters from the operator itself, and if this does not work, you will have to enter the data manually.
☑️ Checking settings APN
Below is a table with popular options for major operators that are often used with Redmi 9. Carefully check the data compliance with your plan.
| Operator. | Name (Name) | Access Point (APN) | Type APN |
|---|---|---|---|
| MTS | mts internet | internet.mts.ru | default,supl |
| Beeline | Beeline Internet | internet.beeline.ru | default,supl |
| Megafon | Megafon Internet | internet | default,supl |
| Tele2 | Tele2 Internet | internet.tele2.ru | default,supl |
After you enter all the fields, be sure to save the profile and select it by ticking or radio button next to the name.
SIM card management and network priority
Xiaomi’s two-symbol smartphones often have confusion about the choice of maps for the internet, allowing flexibility in setting priorities, but the default slot may be the wrong one.
Go to the SIM management menu, where you can set up voice calls and mobile internet separately, and make sure that the "Use for Data" slider is activated for the SIM card that has traffic.
Also, consider your preferred network type. In the "Preferred Network Type" section, select the preferred LTE or 4G (recommended) value. If you choose only 3G or 2G, the speed will be extremely low.
⚠️ Note: When switching a SIM card for the Internet, the active connection can break for a few seconds.
Physical card rearrangement sometimes helps. In Redmi 9, the first slot often supports more stable 4G work, so try rearranging the SIM cards in places by turning off the device beforehand.
Why doesn’t the second SIM card see 4G?
Network reset and system errors
When software failures interfere with the normal operation of the communication module, a complete reset of network settings helps, this action will not delete your personal photos or contacts, but will return all the parameters of Wi-Fi, Bluetooth and mobile communication to factory ones.
To perform this operation, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Press Reset button and confirm the action with the screen unlock password.
Once you reboot, the phone will be like new connectivity, so you'll have to re-enter the Wi-Fi passwords and reconfigure the access points if they don't automatically connect.
This method is effective in cases where, after updating the MIUI firmware, there are constant connection breaks or the inability to enable data transfer.
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Before resetting your network settings, write down passwords from important Wi-Fi networks, as after the procedure they will have to be re-entered.
Checking the physical condition and SIM card
Don't forget the hardware part, too: an old SIM card, a damaged plastic base, or oxidized tray contacts can be the reason for the lack of internet even with the right settings.
Remove the tray with a paper clip and examine the SIM card contacts. If they show scratches or dirt, gently wipe them with a soft dry cloth. Make sure the card lies flat and does not dangle.
If the SIM card is very old (issued more than one) 5-7 years ago, it may not support modern encryption standards or frequency bands 4G. In this case, you need to contact the operator’s communication salon for a free replacement for the USIM.
Also check if the mobile internet service is active on your tariff, sometimes users forget to pay for a packet of traffic or accidentally disconnect the service through your data. USSD-team.
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Replacing the old SIM card with the new USIM in 90% of cases solves the problems with unstable 4G and the lack of Internet on modern smartphones.
Additional settings and hidden settings
For advanced users, there is the option of checking deeper settings through the engineering menu, although newer versions of MIUI often restrict access to it, but there are standard settings that many people forget.
Make sure that the date and time settings are automatically determined, and the wrong time can lead to security certificate errors, which will prevent browsers from opening pages, creating the illusion of no Internet.
Check if the traffic saving mode is enabled for specific applications. In the Settings → Applications → Settings → Data transfer, you can see a list of programs that are prohibited from accessing the network.
If nothing helps, it may be the firmware itself. Check for system updates in the About Phone menu. Installing the current version of the software often contains patches for modem errors.