How to speed up the Internet on Xiaomi Mi 9: the full guide

The Xiaomi Mi 9, released in 2019, is still popular thanks to its flagship features and screen quality. However, in 2026, users may experience a noticeable decrease in the speed of mobile traffic and Wi-Fi connections, due not only to the aging of the hardware, but also to changes in network protocols of operators.

Before resorting to radical measures such as flashing or resetting to factory settings, it is worth conducting a comprehensive diagnosis of current network parameters. MIUI (HyperOS, or HyperOS in later versions, has specific energy-saving algorithms that can aggressively limit the background activity of network modules, and these hidden settings often become a bottleneck that prevents even modern technology from unleashing its potential. 4G/LTE covering.

In this article, we will discuss in detail the proven methods that will help to revive the connection speed, you will learn how to properly configure DNS, optimize APN parameters and what engineering codes can be useful for signal diagnosis.

Diagnostics of current connection and inspection of coating

The first step in solving the problem of slow Internet is to objectively assess the signal quality. Many users mistakenly believe that having four sticks in the status bar guarantees high speed, but this is only an indicator of the signal level, not its bandwidth. Xiaomi Mi 9 is characterized by support for LTE Cat.16 standards, which theoretically allows you to reach speeds up to 1 Gbps, but in practice it all depends on the load of the tower and distance to it.

Use customized speed-measuring apps like Ookla Speedtest or Fast.com to get accurate ping and download rates. Pay attention to the Ping parameter: if it exceeds 100 ms, even high download speeds won’t make it comfortable to play online games or video calls. Often the problem lies in connection instability, when the phone constantly switches between 3G and 4G modes.

Check to see if you have Traffic Saving or Limit Connection modes that can artificially understate the quality of the data being transmitted, and make sure that the mobile network settings are the right type of preferred network.

• 📶 Make sure that in the settings SIM-The card value is selected Preferably 4G or 5G/LTE.
• 📶 Check the signal level at different points in the room, as walls and floors can screen high-frequency ranges.
• 📶 Turn it off. VPN-services at the time of diagnosis, as they can significantly reduce the speed of data exchange.

Resetting and configuring APN access points

The most effective way to solve problems with mobile Internet is to manually adjust access points (APN). Communication operators periodically update their gateways, and automatic settings received by the SMS or at the first installation SIM-Maps may not be relevant in 2026.For Xiaomi Mi 9, the right configuration APN This can be a crucial factor in stabilizing the connection.

To access these settings, go to the Settings menu → SIM-maps and mobile networks → Choose yours. SIM-map → Access points (APN). In the list that opens, find the reset or create a new point button. If you decide to create a new point manually, make sure that the Name fields and the «APN» completed correctly according to your operator data (for example, the Internet for MTS, Internet.beeline.ru for Beeline).

Special attention should be paid to the APN Type field. In some cases, adding additional settings such as dun (for Internet distribution) can change the priority of the connection. Be sure to save the changes and restart the device so that the new settings take effect.

⚠️ Note: When creating a new access point, do not change the values of the Proxy and Port fields unless your operator explicitly requires it.

Optimizing DNS to speed up response

Shift. DNS-Servers are a proven method that often allows you to speed up the opening of web pages and reduce the response time of servers. DNS-Servers provided by the default provider may be overloaded or technically outdated.For Xiaomi Mi 9, using fast public service DNS It can significantly improve the user experience.

Modern versions of the MIUI/HyperOS shell have a built-in Private DNS feature. Go to Settings → Connection and Sharing → Private DNS. The default is Auto, but you can manually prescribe the server address. The most stable and fastest servers are those from Google and Cloudflare.

The use of alternative DNS not only speeds up navigation, but also in some cases allows you to bypass resource locks at the provider level, which is especially true if the standard operator gateways are intermittent.

Management of MIUI Background Processes and Limits

MIUI is known for its aggressive memory and power management policies, which can negatively affect background data synchronization. It can put applications that require constant network access to sleep, considering them energy consumers. To speed up the Internet, you need to exclude important applications from optimization lists.

Go to Settings → Battery and Performance (or simply “Battery”). Here you will find the settings for saving power for specific applications. For instant messengers, navigators and email clients, set the “No Limits” mode, which will allow them to maintain an active network connection even when the screen is off.

It is also worth checking for hidden traffic limits. → SIM-maps and mobile networks → Traffic limit ensure that there is no daily limit when the system automatically slows down or disables data transfers.

• 🚀 Turn off the Traffic Savings feature in the notification curtain if it is active.
• 🚀 In the menu "Extended settings» → «Unlimited Traffic: Add Apps That Should Work Always.
• 🚀 Clear the cache of the Downloads and Google Play services system app, as a crowded cache can slow down the network stack.

⚠️ Warning: Setting “No Limits” mode for a large number of applications can lead to faster battery discharge Xiaomi Mi 9, as they will be constantly active in the background.

Resetting network settings and engineering menu

If software failures become critical, a complete network reset will help.This action will return all Wi-Fi, Bluetooth and mobile network settings to factory values by removing saved passwords and configurations. For the Xiaomi Mi 9, this is often the only way to fix bugs after a firmware update.

You can reset via the Settings menu → Connect and share → Reset Wi-Fi, mobile networks and Bluetooth. After this procedure, the phone will reboot and you will need to re-enter passwords from Wi-Fi networks. This action is safe for your personal data (photos, contacts), but affects only network configurations.

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Resetting network settings eliminates 90% of software conflicts associated with incorrect operation of communication modules after system updates.

You can use the engineering menu to get a deeper diagnosis, and type ##4636## into the dialer. From the menu that opens, select Phone Information, and you can force a network type switch, like denying 3G, leaving only LTE, or resetting the radio.

Click Toggle Radio to turn off and turn on the modem without restarting.

Be careful with the engineering menu: changing unknown parameters can lead to unstable operation of the device, the main purpose here is to check the signal statistics and force the phone to re-register on the network.

Hardware factors and SIM-map

Don’t forget that Xiaomi Mi 9 — The device is not new, and physical factors also play a role. SIM-A card issued several years ago may not support modern encryption and frequency standards, leading to a drop in speed. SIM-map 4G/USIM, It's a free procedure.

Also check the physical condition of the tray. SIM-Oxidation or poor contact can cause periodic breaks in the connection. SIM-Module, try to extract the second card: in some modes of operation with the active second number, the data transfer speed on the main can decrease due to the features of the Qualcomm modem in Dual mode. SIM Dual Standby.

• 💾 Replace. SIM-map, if it's more 3-4 years, new with support 4G.
• 💾 Wipe your contacts. SIM-soft dry cloth before installation.
• 💾 Try using only one. SIM-speed-check.

⚠️ Note: Do not use hand-cutting SIM-Incorrect geometry or a damaged chip can short-circuit and cause the smartphone communication module to fail.

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Use the original tray for SIM-Third-party or damaged trays may not provide a tight fit, causing signal loss at the slightest vibration or impact.

Frequently Asked Questions (FAQ)