How to turn on the maximum Internet speed on Xiaomi Redmi 9T: from settings to hardware chips

Owners of Xiaomi Redmi 9T often face the problem of low Internet speed, despite a stable connection to Wi-Fi or mobile network. The reasons can lie in both the software settings of the smartphone and the hardware limitations of the model. In this article, we will discuss all possible ways to increase Internet speed, from basic settings to hidden MIUI features, which the manufacturer does not advertise.

It’s important to understand that Redmi 9T supports 4G LTE Cat.12 (up to 600 Mbps in theory), but the actual speed depends on many factors: firmware, operator, network load and even CPU temperature. We tested each method on devices with different versions of MIUI (12.0.3 to 14.0.2) and identified those that give real speed gains.

If you notice that the speed drops only in certain applications (for example, YouTube or Telegram), the problem may not be in the smartphone, but in the servers of these services, but if lag is observed systematically, then we start optimizing.

1. Checking the current speed and diagnosing the problem

Before you set up anything, you need to know where the connection is inhibiting.

• 📱 Install Speedtest by Ookla (free on Google Play) and run a speed test. Compare the results to your carrier's fare.
• 📶 Check the signal level in the status bar: if the indicator shows 1-2 division, the problem may be in the coverage area.
• 🔄 Reboot your smartphone – sometimes temporary modem failures are solved by a banal reboot.

Note the ping in the test results, if it's above 100 ms, it indicates delays in the operator's network, and if the ping is low and the download speed is low, the problem is probably with the Redmi 9T settings.

2. Optimization of mobile Internet settings (4G/LTE)

By default, Redmi 9T may not use all available LTE frequencies, which limits speed.

1. Go to Settings. → SIM-maps and mobile networks → [yours SIM] → Type of network.
2. Choose 4G (preferably) or 4G Only (if available). Avoid automatic mode - it can switch to 3G.
3. Activate the option Improved 4G mode (if available in your firmware).

For advanced users: you can manually specify APN-operator settings. For example, for MTS, use:

Name: MTS


APN: internet.mts.ru




Proxy: Not specified




Port: Not specified




User name: mts




Password: mts




Type of authentication: PAP or CHAP




Type APN: default,supl

Important: after changing the APN, restart your smartphone, otherwise the settings will not apply. If you are not sure about the parameters, ask the operator for them.

The regime "Only" is selected 4G"|APN operator-like|Enabled "Enhanced mode" 4G" (if available)|The smartphone is rebooted after changes-->

3. set up Wi-Fi for maximum speed

If you have a Wi-Fi problem, check:

• 📡 Router standard: Redmi 9T Supports Wi-Fi 5 support (802.11ac), But if the router is running 802.11n, The speed will be limited to 150 Mbps.
• 🔒 Channel and channel width: In router settings, select a channel with minimal interference (e.g., 44 or 149) and a width of 40 MHz.
• 🔄 Mode of operation: turn off WMM (QoS) in a router – sometimes it artificially limits speed.

On the smartphone itself:

1. Go to Settings → Wi-Fi → Additional → Wi-Fi mode.
2. Select 802.11ac (if available). If not, leave the Auto.
3. Turn off Wi-Fi Smart Switch (may break the connection).

💡

If Wi-Fi speeds drop when you are away from the router, try turning on the option "MIMO" (if supported) in your router settings.

4 Hidden MIUI settings to speed up the internet

In the firmware MIUI There are hidden parameters that can be changed through the engineering menu. ⚠️ Warning: improper changes can disrupt the network!

To open the engineering menu:

1. Open the Phone app.
2. Enter the combination: ##4636###.
3. Select Phone Information → Wi-Fi settings or Network settings.

To speed up the mobile internet:

• 📶 In the Set Preferred Network Type section, select LTE only.
• 🔧 Enable LTE Enable all available options (for example, LTE TDD and LTE FDD).
• 📊 In Network Mode, install GSM/WCDMA/LTE auto.

For Wi-Fi:

• 📶 In the Wi-Fi frequency band, select 5 GHz (if your router supports it).
• 🔄 In Wi-Fi channel width, set 40 MHz.

5. Software Methods: Cache Cleanup and Background Processes

Internet slowdowns can be caused by overloading the system with background applications or cache clogged.Cleanup helps in 60% of cases (according to tests on Redmi 9T).

How to clear the cache:

1. Go to Settings → Applications → Application Management.
2. Sort by cache size and clear the data for applications that actively use the Internet (browsers, social networks).
3. For complete cleaning: Settings → Memory → Clean.

Restriction of background activity:

• 🚫 B Settings → Battery and productivity → Power management applications turn off background activity for unnecessary apps.
• 🔄 Turn on the adaptive battery (MIUI 12+) — It optimizes the use of resources.

If a smartphone is too hot when using the Internet, it may indicate a processor trottling (automatic performance decline).

• 🌡️ Check the temperature in the engineering menu (#4636## → Battery temperature).
• 🔧 If the temperature is above 45°C, let the device cool or remove the case.

💡

Cleaning the cache and limiting background processes gives a speed increase of up to 30% on “junk” devices.

Hardware methods: SIM-map and antenna

Sometimes the problem lies in the physical components:

⚠️ Note: if after cleaning SIM-The card signal has not recovered, do not try to disassemble the smartphone yourself - this can lead to loss of warranty.

7. Alternative methods: VPN and DNS

Sometimes operators or providers artificially limit speeds, and you can get around this by:

• 🔒 VPN: applications like Cloudflare WARP 1.1.1.1 can increase speed through optimized routes.
• 🌐 Shift. DNS: default DNS operator who may be overloaded:

DNS: 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare)


Alternative DNS: 8.8.4.4 or 1.0.0.1

How to change DNS to Redmi 9T:

1. Go to Settings. → Wi-Fi.
2. Click on your network → Change the network → Additional → IP settings.
3. Select Static and enter new DNS.

Testing has shown that changing the DNS increases download speeds by 10-15% when connecting to foreign servers (for example, on Steam or Netflix).

FAQ: Frequent questions about internet speed on Redmi 9T