The situation when the flagship smartphone with a powerful processor and an excellent screen suddenly begins to “think” when loading pages or interrupts video broadcasting, is familiar to many owners of Xiaomi equipment. The problem often lies not in the hardware weakness of the device, but in software conflicts, incorrect network settings or specific features of the shell MIUI and HyperOS. Before you blame the operator or think about buying a new router, it is worth conducting a deep diagnosis of the gadget itself.
In this article, we will take a closer look at hidden engineering menus, DNS settings, Bluetooth modules that can interfere, and other system nuances, and learn how to properly switch radio modes and clean the cache of network services, which in most cases allows you to return a stable connection without unnecessary costs.
Connection stability is a complex metric that depends on a variety of factors, from base station signal quality to operating system background processes, and understanding how your Xiaomi manages network connections will be key to solving the problem of low speed.
Diagnostics of the current network status and signal
The first step should always be to make an objective assessment of the current situation, not just rely on a subjective sense of the slow Internet, but built-in Android tools and third-party utilities allow you to get accurate data about signal strength, noise level and real data rate at a particular time.
If you see H+ or 3G instead of 4G or 5G, you may see the problem on the operator side or in the area of poor coverage, however, even if the signal scale is full, the speed can be slow due to high loading of the tower or interference.
For in-depth analysis, use an engineering menu or specialized applications. Enter the code ##4636## to access the test mode in the ringer. This displays the signal level in dBm (dBm). Values closer to 0 (for example, -70 dBm) mean an excellent signal, and values below -110 dBm indicate a critically weak reception.
⚠️ Note: In the engineering menu, do not change the settings, the value of which you do not understand. Resetting the parameters of the radio module can lead to a temporary loss of communication with the operator's network.
Use applications like Network Cell Info Lite or the standard speed test from Speedtest. Write down the results at different times of the day. If the speed drops during peak hours (evening), this indicates that the provider's network is overloaded, not that the phone is malfunctioning.
Resetting network settings and cleaning the cache
The accumulated errors in network profile configurations are one of the most common causes of instability, both in stored Wi-Fi networks and in mobile Internet access point (APN) settings, which are often miraculously reset.
To perform the reset, go to Settings → Connection and Sharing → Reset Wi-Fi, mobile networks and Bluetooth. Note that after this operation, you will have to re-enter passwords from all Wi-Fi networks and repair Bluetooth devices, but the configuration of the radio modules will return to factory values.
☑️ Checklist before network reset
Special attention should be paid to cleaning the cache of Google Play services and system services that can block network requests. Go to Settings → Apps → All applications, find Google Play Services and select Clear Cache. This is secure and will not delete your personal data.
Also check the date and time settings. An incorrect date can cause security certificate errors, causing browsers and apps to refuse to download content, creating the illusion of no internet.
Optimizing Wi-Fi and DNS settings
Standard. DNS-Your ISP's servers are often slow or censored. DNS faster and more reliable servers (e.g. from Google or Cloudflare) can significantly speed up page response and app launches.
In modern versions MIUI HyperOS can be done without root rights through the menu "Private". DNS». Go to Settings. → Connection and sharing → Private DNS. Select the option “Host Name Provider” DNS» and enter the address dns.google or 1dot1dot1dot1.cloudflare-dns.com.
| DNS Provider | Address (Hostname) | Advantage |
|---|---|---|
| Google Public DNS | dns.google | High stability and speed |
| Cloudflare | 1dot1dot1dot1.cloudflare-dns.com | Emphasis on privacy and security |
| AdGuard DNS | dns.adguard.com | Blocking Advertising at the Network Level |
| Quad9 | dns.quad9.net | Blocking phishing sites |
If you're using 5GHz Wi-Fi, make sure the router is in line of sight. This range provides high speeds but very poor through walls. For large apartments or thick-walled homes, it's sometimes more profitable to switch to 2.4GHz, sacrificing top speed for signal stability.
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Useful tip: If the router is dual-band, try to separate the network names for 2.4 GHz and 5 GHz. This will force the phone to connect to the desired range, eliminating automatic switching to a weaker signal.
Mobile Data and Access Points (APN) Management
APNs are the gateway through which your phone connects to the carrier’s internet, often after a firmware update or SIM card change, these settings may be confused or suboptimal for the current location.
Go to Settings. → SIM-maps and mobile networks → Select a SIM card. → Access points (APN). Click Reset (usually at the bottom of the screen or in the three-dot menu) to restore factory settings for your operator. If the problem persists, you can create a new point manually by copying the settings from the operator's official website.
An important nuance for Xiaomi is the Network Acceleration feature, which allows the phone to use Wi-Fi and mobile Internet simultaneously to speed up loading, but in practice this often leads to increased traffic consumption and instability. → Wi-Fi → Wi-Fi assistant → Accelerating networks.
⚠️ Warning: Enabling Network Acceleration Mode can lead to unintended mobile traffic consumption, even if you’re connected to home Wi-Fi.
It’s also worth checking if the traffic saving mode for background apps is on, and if the system aggressively restricts background activity, instant messengers may not receive messages on time, creating a feeling of poor internet.
The impact of Bluetooth and other modules on speed
Few people know that Wi-Fi and Bluetooth are both operating in the same frequency range (2.4 GHz), and that both can interfere with the same frequency, causing speed to drop and ping to increase, especially when using wireless headphones or fitness bracelets.
If you notice that the Internet “slows down” it is with connected Bluetooth devices, try in the Wi-Fi settings to force the router frequency to switch to 5 GHz. If this is not possible, temporarily turn off Bluetooth to test the hypothesis.
Also, speed can be affected by the NFC enabled. Although it works on a different frequency, constantly polling tags or cards in the background loads the processor. Turn off the NFC in the notification curtain if you are not using contactless payment right now.
Technical reference on frequencies
Specificity of MIUI and HyperOS with the network
Xiaomi’s shells have power management features that directly affect network activity. An aggressive Task Manager can kill background processes that maintain connectivity, especially if the battery is low.
Check the battery settings for key applications. Go to Settings → Battery → (cogwheel) → Application energy saving. Make sure that the browser, messengers and navigator are “No Limits” that will allow the applications to freely use the network.
Another feature is the Wi-Fi Assistant, which automatically switches the phone to the mobile Internet if the Wi-Fi signal seems weak to the system, which can cause connection breaks if the sensitivity threshold is not set correctly, and turn off this option in the Wi-Fi menu if you notice frequent jumps between types of networks.
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The main conclusion: Optimizing MIUI network operation is to disable aggressive energy savings for network services and manage automatic switching functions between Wi-Fi and 4G.
When to suspect a hardware problem
If the software methods didn't help, maybe it's the hardware. The antenna module in Xiaomi smartphones, like any other, can degrade or damage over time. Frequent falls, moisture or just a production defect can cause poor reception.
Symptoms of hardware problems: the phone warms up strongly in the upper end when trying to access the network, the speed drops to zero even at full signal level, or the device does not see any network at all after reset.
In such cases, software repair is powerless, and it requires a diagnostic at a service center, where testers will check the antennas' standing wave coefficient and the integrity of the plumes.