When a Xiaomi or Redmi smartphone suddenly loses access to the global network, it can be taken by surprise at the most inopportune moment: you see a 4G or LTE icon, but the pages in the browser do not load, and the messages in the messengers freeze. This is a common problem that is often solved by software methods without going to the service center. Most of the time the failure lies in the incorrect settings of the access point or a temporary conflict of system processes.
Mi and POCO owners face this regularly after updating their MIUI or HyperOS operating system. Sometimes the reason is trivial: they run out of money or lose their region. It's important to consistently check all possible options, from simple reboots to complex manipulations of the engineering menu. Our goal is to restore a stable connection as quickly as possible.
Before you go to radical measures, it is worth eliminating external factors: check the balance, make sure that the SIM card is properly installed in the slot and has no physical damage. If the problem persists, then it is time to delve into the settings of your gadget. Further instructions will help you diagnose and fix the malfunction.
Basic diagnostics and reboot of communication modules
The first thing you do is reboot the device, which clears RAM and restarts all system services, including the radio module. Often, it's a temporary driver failure that blocks data transmission. If a simple reboot doesn't work, try switching network mode.
Go to the settings and select a paragraph "SIM-Maps and mobile networks. Try to force switching from 5G/4G/3G/2G (Car only 4G Or, conversely, just 3G. This will help you understand whether the Internet is working at all or whether the problem is in the standard of communication of your carrier, sometimes the phone sticks on the tower with a bad signal, and the change of priority of networks forces it to reconnect to a more stable source.
⚠️ Attention: Switching to "Only" mode 2G" It can shut down the Internet completely, because this standard is primarily for voice communications.
It's also worth checking if the flight mode is activated. Sometimes the system doesn't properly exit this mode. Turn on "Flight Mode" for 10-15 seconds, then turn it off. You'll notice the communication icons disappear and reappear, indicating that you're re-registered on the operator's network.
- 🔄 Perform a full smartphone reboot through the power menu.
- 📡 Switch the network type in the settings SIM-card 4G Only for the test.
- ✈️ Activate and deactivate flight mode to reset module.
Checking the settings of the APN access point
The most common reason for the lack of Internet is the downed settings of the access point. APN. These are the parameters that tell the phone which gateway to access the network through. SIM-This data may conflict or disappear. You need to manually check and, if necessary, create a new profile.
To do this, go along the Settings path. → SIM-maps and mobile networks → Choose. SIM-map → Access points (APN). In the list that opens, you should see your carrier profile. If the list is empty or the Internet is not working, click the New Access Point button (usually at the bottom of the screen or in the three-dot menu).
You need to enter data carefully, observing the regr of letters. Usually, it is enough to specify a name (for example, the Internet) and an access point (APN), which can be found on your operator's website. The remaining fields, such as username and password, are often left empty or filled in according to the operator's instructions. After entering, be sure to click "Save" and select the created point active.
Codes for quick login to the APN menu
If manual creation doesn't work, look for the "Reset to default settings" option in the access point menu. The system automatically pulls up current settings from a database stitched into the firmware, which often solves the problem when the operator changes the connection specifications.
Network reset and system errors
When you're not using APN, you can use a deeper method, which is resetting your network settings, which will bring all your Wi-Fi, Bluetooth, and mobile Internet settings back to factory values, and it's important to understand that your personal files, photos, and contacts won't be affected, but you'll have to re-enter your stored Wi-Fi passwords.
Find the Connection and Sharing section in the settings, or search by settings by typing the phrase "Reset." Select the option "Reset Wi-Fi, mobile and Bluetooth." Confirm the action with the screen unlock code. Once the phone reboots, it will look for networks as new.
| Action. | Impact on data | Need for a reset |
|---|---|---|
| Phone reboot | Safe. | Yes (automatically) |
| Flight mode | Safe. | No. |
| Resetting network settings | Removing Wi-Fi passwords | Recommended |
| Reset to factory | Complete deletion of data | Yes. |
There is also a hidden option to reset the radio module through the engineering menu, but it requires caution. In the phone app, dial ##4636##. If the menu opens, select Phone Information and find the Start Ping Check button. If the test fails, you can try to switch the preferred network type in the same menu, but only for advanced users.
☑️ Checklist before resetting settings
Problems with SIM-map and physical contact
The physical factor cannot be excluded. SIM-A card is a chip that can oxidize or get micro-damaged over time. If a Redmi phone doesn't see the network or constantly writes "No Service," remove the SIM card tray. Pay attention to the metal contacts: they must be clean and scratch-free.
Wipe the chip with a soft dry cloth. Make sure the tray is inserted before the click and is properly oriented. In dual-symbol phones, try moving the card to another slot. Sometimes one of the slots may not work properly due to design features or the device's fall.
⚠️ Warning: Never use metal objects (needles, scissors) to clean your contacts. SIM-If you don't have a dielectric, static electricity or a short circuit can permanently disable the chip.
Also check if yours is supported. SIM-standard 4G/LTE. If the card is very old (issued) 10-15 It may not work properly in modern networks, especially in the mode of 4G. In this case, the operator can block high-speed access. Replace the SIM card with a new one in the salon, saving your number - this service is usually free or inexpensive.
- 🧹 Wipe your contacts. SIM-wipe-card.
- 🔄 Change the SIM card between slots 1 and 2.
- 📞 Check the card on another phone to rule out chip failure.
Influence of region and firmware version
Xiaomi devices are divided into global (Global), European (EEA) and Chinese (China) firmware versions. Sometimes changing the region in your phone settings helps solve an Internet problem. Go to Settings → Additional Settings → Region and select a country other than your current (e.g. India or Indonesia), then return it back. This can update network configuration files.
Also, check for system updates. Developers often release patches to fix modem errors. Go to Settings → About phone and click on the MIUI version logo. If an update is available, install it.
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If you are using the Chinese version of firmware (CN) with global frequencies, make sure that the settings activate the desired LTE bands. Sometimes switching to the developer menu for the preferred LTE Only network type helps, but this can turn off incoming calls (VoLTE must be enabled from the operator).
However, if you recently upgraded from a stable version to a beta version (Beta) or reflashed the phone, the problem may be the build itself.In such cases, users often report Internet bugs on forums. The only solution may be to roll back on the previous version or wait for a new patch.
When needing specialist assistance
If none of the software methods worked, and the SIM card is guaranteed to work in other devices, the problem can be hidden in the hardware. In Xiaomi smartphones, sometimes the antenna module or plume that connects the board to the case fails, this often happens after falls or moisture.
The symptoms of a hardware breakdown are: a complete lack of network search even when reset, heating the bottom of the phone when trying to connect, or a sharp increase in battery consumption in standby mode.
In such cases, self-repair without equipment and skills is impossible. You need to contact an authorized service center for diagnostics, the wizard will check the signal level on the antenna and the integrity of the modem power circuits.
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If resetting network settings and replacing SIM-cards did not help, and in another phone the SIM card works - there is a high probability of hardware malfunction of the antenna or modem of your Redmi.