Owners of Redmi Note 9 smartphones often face a situation where the speed of mobile Internet or Wi-Fi does not meet the operator’s stated tariffs, which can be caused by software failures in the MIUI shell, as well as incorrect settings of network parameters by default. Deep system optimization allows you to significantly improve connection stability and reduce ping in games.
Before you start complex manipulations, you need to exclude trivial reasons, such as channel overload or temporary failures at the provider. In most cases, the problem is solved by competent configuration of the access point and switching the modes of operation of the radio module, you can return the device to its former aspiration without using third-party software.
In this article, we will discuss proven methods that are relevant to current firmware versions: we will touch on both standard Android tools and hidden engineering menus. Follow the instructions consistently to identify and eliminate the cause of slow loading pages.
Basic diagnostics and resetting of network settings
The first step should always be a basic diagnostics that eliminates temporary software errors. Often the communication module “hangs” in a sub-optimal state after switching between towers or energy saving modes.
To force all network interfaces to reboot, use network resets, which will return Wi-Fi, Bluetooth and mobile internet to factory values without affecting your personal files and photos, and after that, the phone will search the network again, selecting the most stable channels.
You can reset through the system settings menu. Find the Connections and Sharing section, then select Reset Wi-Fi, mobile networks and Bluetooth. Confirm the action by entering the unlock password. The device will reset network services, which often solves the problem of "floating" signal.
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Before resetting, make sure you remember passwords from your Wi-Fi networks, as they will be deleted from your phone’s memory.
If the speed has not increased after the reboot, check the physical condition of the SIM card. Old Mini-SIM cards, cropped with scissors, can not communicate well with the current conductive tracks of the tray. In such cases, the module may not correctly register on the 4G network, constantly switching to EDGE or 3G.
Optimizing the settings of the APN access point
The most effective way to speed up mobile internet is to manually configure the APN hotspot. Operators often provide standard settings that don’t take into account the specific region or the load of the base stations. Changing the protocol and the type of APN can give a noticeable increase in speed.
To enter the settings menu, go on the Settings path → SIM-Maps and mobile networks. Select your SIM card, then press Access Points (APN). In the lower right corner, click the menu button and select “New Access Point” or “Reset to Default” if you want to start from a clean slate.
In the window that opens, you need to change a few critical settings: Find the APN Type field and write default,supl. It is also important to change the APN Protocol to IPv4/IPv6, as some operators work better with dual stack. Remember to save the profile before activating.
☑️ Setting up APN maximum speed
There are special APN strings for different operators that are sometimes hidden in system files. For example, for MTS or Beeline, there may be alternative gateways that are less loaded during peak hours. Experiment with point names, adding suffixes, but retaining basic authentication parameters.
⚠️ Warning: Don't delete your operator's standard access points completely. Create a new point with changed parameters and activate it. If the Internet stops working, you can always go back to the factory profile.
Working with DNS and Private Servers
The speed of opening sites often depends not on the data channel, but on the response time of the domain name server (DNS). Standard DNS providers can be slow or prone to blocking. Using fast public servers allows you to speed up domain resolution.
In the shell. MIUI Android 9 and above support for private DNS». It is a function that encrypts DNS-requests and forwards them to the selected server, bypassing the provider. → Connections and sharing → Private DNS.
Select the Private DNS Host Name mode and enter the address of one of the fast servers. The most stable and fast options at the moment are:
- 🌐 dns.google – Google servers that provide high speed and reliability.
- 🛡️ 1dot1dot1dot1.cloudflare-dns.com — one of the fastest DNS in a world with a focus on privacy.
- 🚀 dns.adguard.com – a server that also blocks ads in browsers and some applications.
Once you enter the address, click Save. Changes take effect instantly. You can check the result by opening a heavy site or running a speed test. If the site stops loading, then the selected site is the one that you have chosen. DNS-The server is temporarily unavailable or blocked by your operator – just disable the feature or try another address.
Why does it work?
Selection of preferred network type and frequencies
The Redmi Note 9 supports a wide range of frequencies, but sometimes the system mistakenly prioritizes 3G stability over 4G speeds if the LTE signal is weak. Forced switching to 4G Only mode can improve the situation in areas of uncertain reception.
To access the hidden engineering menu, enter the code ##4636## in your phone. From the menu that opens, select Phone Information. Find "Configure preferred network type" and select LTE only. Be careful: this mode may not work incoming calls unless VoLTE technology is enabled.
To get it back to you as you can by selecting LTE/TD-SCDMA/CDMA/EvDo/GSM/WCDMA. This is the standard mode that allows the phone to switch freely between generations of communication. For gaming sessions where low ping is important, LTE only can be useful, but requires good coverage.
| Network mode | Description | Impact on the battery | Recommendation |
|---|---|---|---|
| 5G/4G/3G/2G (Auto) | Automatically select the best network | Medium. | For daily use |
| LTE only | 4G only, no 3G fallback | Low (if the signal is good) | For games and stable ping |
| 3G/2G (Auto) | Disconnecting the 4G module | Low. | To save charge in the wilderness |
| GSM only | Just voice and text. SMS | Minimum | Critical economy |
It’s also worth checking if Traffic Savings is enabled in mobile network settings, which limits the background data transfer for applications, which can create the illusion of slow internet when notifications arrive with a delay.
Elimination of background load and limits
Often, the speed drops because background processes are driving traffic. MIUI shell is known for its aggressive work with background tasks, but some system services may be behaving incorrectly. Check the data usage statistics.
Go to Settings → Connections and Sharing → Traffic Usage. Analyze the application list. If you see a program or system service consumes a lot of megabytes in the background, limit it. Click on the application and select Background Connection → No or Restricted.
Pay special attention to cloud storage sync and application updates. If you have high-quality photo sync enabled over a mobile network, it can completely clog the channel, and you should only configure sync over Wi-Fi.
⚠️ Attention: Restricting background activity of system applications (e.g. Google Play Services) can lead to unstable notifications and geolocation.
Another cause could be overcrowded DNS cache or system debris.Although Android is able to self-clean, manually cleaning the cache through the recovery menu or third-party utilities (use with caution) can free up the CPU resources to handle network packets.
Hardware factors and externalities
Physical factors are not to be discounted: a case with a metal insert or magnetic holder can shield the Redmi Note 9 antennas that are located around the perimeter of the case, remove the case and check if the signal level changes.
The battery level also affects the power of the antenna radiation, and in energy-saving mode (especially Ultra or Super), the system reduces the transmitter power to save energy, which directly affects the speed of the Internet in the area of insecure reception.
If you are in a room with thick walls or in a basement, a signal is sent. 4G It can bounce back and come down weakened, and in these cases, it helps to move closer to the window or use Wi-Fi Calling, if your carrier and phone support this feature. SIM-map.
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A comprehensive approach – a combination of setting up APN, DNS and choosing the right network mode gives a better result than using only one method.