Xiaomi Mi 9 remains one of the most popular flagships, but owners of Chinese versions or users who have changed operators often face difficulties in activating high-speed Internet. The problem can be not only in the lack of coverage, but also in software restrictions or incorrect settings of the access point. If your device shows only 3G or H+, this significantly reduces the speed of loading pages and navigation services.
In most cases, 4G activation does not require a device flashing or rooting. It is sufficient to correctly prioritize network types in the engineering menu or correctly prescribe your operator's APN settings. It is important to understand that the Mi 9 supports a wide range of frequencies, including Band 3, 7 and 20, which ensures stable operation in cities and beyond.
Before proceeding with complex manipulations, it is necessary to exclude trivial reasons: the presence of support. LTE yours SIM-It is also worth checking whether the traffic saving mode is activated, which can forcefully limit the connection speed to the minimum values. In this article, we will take a detailed look at all the stages of configuration, from simple menu switches to editing system configuration files.
Verification of support LTE operator SIM-card
The first step is to verify the technical capabilities of your SIM card. Old cards issued more than 5-7 years ago may not physically support LTE standards and only work in 3G mode. To clarify this information, the easiest way is to call your mobile operator’s support team or visit the nearest communication salon for a free SIM replacement with a new 4G support.
You also need to make sure that the plan provides access to fourth-generation networks. USSD-If your SIM card is catching on other devices 4G, And on Xiaomi Mi 9 is not, then the problem lies in the settings of the phone.
Notice the physical state of the SIM card contacts. Oxidation or micro-scratches can lead to an unstable connection, in which the phone cannot agree with the base station to switch to a high-speed protocol. Try gently wipe the chip with soft cloth and reinstall the tray.
- 📞 Contact the operator to confirm support 4G on your room.
- 💳 Replace the old one. SIM-chip-card USIM, if she is over 5 years old.
- 📡 Check the network coverage LTE in your current geolocation on the operator map.
- 🧹 Clean the SIM card and tray contacts from dust and oxides.
⚠️ Note: If you use two SIM cards, remember that Xiaomi Mi 9 activated 4G One of them, the second often forced to switch to the mode 2G/3G. This is normal behavior for most modems of that generation.
Basic configuration of the preferred network type
Standard shell interface MIUI You can select a priority network type without using hidden menus. To do this, go to the settings section, select a paragraph. SIM-maps and mobile networks, then click on the desired SIM card. In the menu that opens, find the option Preferred network type.
For maximum coverage and speed, you should choose Preferably 4G or LTE/TD-SCDMA/GSM. If the word "LTE" or "4G" is missing from the list, this may mean that the region of the phone (Region) is set to a country where these frequencies are not used, or the firmware has software restrictions.
Sometimes it helps to just restart the communication module. Turn on the flight mode for 10-15 seconds, and then turn it off. This will cause the modem to re-register on the network and try to find an available LTE base station. If after that the 4G icon appeared, but the Internet does not work, the problem lies in the settings of the APN access point.
☑️ Checking basic settings
It is important to note that some versions of MIUI hide the choice of specific frequencies, and if the standard menu does not work, you will need to move to deeper settings through the engineering menu or use special applications to change the region.
Setting up an APN access point for 4G
The common reason why a phone sees a network 4G, but does not transmit data, are incorrect parameters of the access point APN. This data automatically comes from SMS from the operator, but in case of failures or manual adjustment, they must be manually prescribed. → SIM-maps and mobile networks → (Choose. SIM) → Access points (APN).
In the list that opens, click New Access Point or Plus icon. You need to enter the data corresponding to your operator. Errors in spelling the name of the access point even in one character will make it impossible to connect to the Internet. After filling in all the fields, be sure to click More → Save and activate the new point by ticking next to it.
Below is a table with the basic parameters for popular carriers that are most commonly used with Xiaomi Mi 9. Note that the Login and Password fields are usually left blank.
| Operator. | Name (Name) | Access Point (APN) | Type APN |
|---|---|---|---|
| MTS | mts-internet | internet.mts.ru | default,supl |
| MegaFon | megafon-internet | internet | default,supl |
| Beeline | Beeline Internet | internet.beeline.ru | default,supl |
| Tele2 | Tele2 Internet | internet.tele2.ru | default,supl |
| Yota | Yota | internet.yota | default,supl |
After saving the settings, it is recommended to restart the device. If the Internet does not appear, try setting the new access point in the "APN type" field to prescribe default,supl,dun, which sometimes helps to bypass the operator's restrictions on distribution of the Internet.
Using an engineering menu to select frequencies
If standard methods don't work, you can use the Xiaomi Engineering Menu, which is a hidden section that allows you to control the modem settings directly. To log in, open the Phone app and dial the combination ##4636#. If the menu doesn't open, your firmware may block this code and you will need to install a special application from the Play Market store, such as "4G LTE Switcher".
From the menu that opens, select Phone Information. Find the drop-down list Set Preferred Network Type. Here you need to select an option that contains LTE, such as LTE Only or LTE/TD-SCDMA/GSM.
Be careful with LTE Only mode. In this mode, the phone will stop seeing 2G and 3G networks. If you find yourself in an area where there is no 4G coverage, the connection will disappear completely and you will not be able to receive calls (unless VoLTE technology is used), so for everyday use, it is better to choose combined modes.
⚠️ Warning: Do not change other parameters in the engineering menu unless you are sure of their purpose.Resetting important parameters of the radio module can lead to the complete disappearance of the network or IMEI.