“Do not turn off mobile Internet when connecting to Wi-Fi” on Xiaomi: what is this feature and why is it needed?

Have you ever noticed Xiaomi, Redmi or your smartphone? POCO This is a strange notification: "Don't turn off mobile Internet when you connect to Wi-Fi" -- this phrase appears in the data settings or when you first connect to a new network, but few people understand what it really means. Many users simply ignore it, considering it another "glitch» MIUI, But actually, there's an important mechanism behind this function to optimize the communication.

In this article, we will look at why Xiaomi asks you not to turn off your mobile Internet, how it affects download speed, connection stability, and even battery consumption. You will learn what technologies are behind this setup, how to configure it correctly, and when it is better to turn it off. And also how to avoid common mistakes that lead to slow Internet or sudden communication interruptions.

If you think it's just a feature of Chinese smartphones, you're wrong: Samsung and the Google Pixel have similar mechanisms, but they just work differently. Xiaomi has made this feature more visible -- and now users have more questions. Let's get it straight.

What does it mean to “not turn off mobile internet when connecting to Wi-Fi”?

This phrase is not a whim of developers, but a consequence of the work of the technology “Wi-Fi Assist” (or its analogue in the Internet). MIUI). The bottom line is that Xiaomi’s smartphone doesn’t completely switch to Wi-Fi, but keeps the mobile connection in the background?

Wi-Fi and mobile internet are used in parallel to:

• 🔄 Smooth switching between networks (for example, if Wi-Fi suddenly goes missing, traffic will not be interrupted).
• ⚡ Accelerate downloads (some data can be downloaded simultaneously via two channels).
• 📱 Connection stability (with a weak Wi-Fi signal, mobile Internet picks up some of the requests).
• 🔒 Security (some system updates and authentication pass through the mobile network).

In practice, it looks like this: you connect to Wi-Fi, but the smartphone does not turn off LTE/4G/5G Instead, it reduces the activity of the mobile connection, but it keeps it ready. It doesn't mean that traffic will double, it intelligently distributes the load.

But there’s a caveat: if you manually turn off mobile data in your settings, some features (like fast network switching or background synchronization) may work worse, which is why Xiaomi warns about this.

What technology is behind this function?

In Xiaomi smartphones, several mechanisms are responsible for the parallel operation of Wi-Fi and mobile Internet.

1. Wi-Fi Assist (similar to Apple)

This technology automatically switches to mobile data if the quality of Wi-Fi deteriorates (for example, you have moved too far from the router). MIUI It works a little differently: instead of switching completely, the system uses both connections simultaneously for critical tasks (for example, for voice calls over Wi-Fi or security updates).

2. Dual Network Acceleration (DNA)

Xiaomi’s signature chip, which allows you to download large files (for example, system updates or games) on two channels at once: Wi-Fi + It speeds up 20 to 40 percent, but it requires that mobile data be turned on, DNA automatically deactivated.

3. Seamless Handover (smooth transition)

When you leave Wi-Fi coverage (e.g., leaving your home), your smartphone doesn’t break the connection abruptly, but seamlessly transfers active tasks (calls, downloads, streaming video) to your mobile network. If mobile Internet is manually disabled, a communication disconnection may occur.

Background synchronization

Some applications (e.g. Mi Cloud, Google Drive, instant messengers) use the mobile network to synchronize data even if you are connected to Wi-Fi, due to the limitations of some Wi-Fi networks (e.g. hotels or airports) where certain ports are blocked.

💡

If you notice that your smartphone gets a lot hot when downloading files over Wi-Fi, try turning off Dual Network Acceleration in the settings. Sometimes, the parallel operation of two communication modules increases the load on the processor.

How to check if this feature is enabled on your Xiaomi?

To find out if the “do not turn off mobile internet” setting is active, follow the following steps:

Include mobile data

Connect to the Wi-Fi network

Open the Settings. → SIM-maps and mobile networks → Transfer of data

Check the "Wi-Fi" item + Mobile data" or "accelerating downloads»

If the option is active, the smartphone uses both connections.-->

On different versions MIUI The path may be a little different:

• 📱 Nana MIUI 12/13/14: Settings → Connections and sharing → Double network acceleration.
• 📱 Nana POCO Launcher or Redmi with custom firmware: Settings → Additionally. → Network mode.
• 📱 On older versions (up to) MIUI 11: The option may be called Smart Switch).

If you don’t find this item, your Xiaomi model doesn’t support Dual Network Acceleration (usually low-end devices like Redmi). 9A or POCO C31). In this case, the “do not disconnect mobile Internet” notice applies only to Wi-Fi Assist.

You can also check the activity of connections in real time:

1. Open Settings → About the phone → SIM-card status.
2. Look at the status of the mobile network: if it says “Connected” (even with active Wi-Fi), then the function is working.

When should you turn off the parallel use of Wi-Fi and mobile Internet?

While the feature is useful in most cases, there are situations where it is best to deactivate it:

The function may also interfere in the following cases:

• 🔌 Connect to public Wi-Fi (cafes, airports) where you need to log in via a browser. Sometimes a smartphone tries to use mobile data instead of Wi-Fi, and the authorization page does not open.
• 📡 Using a mobile hotspot (if your Xiaomi is giving the internet to another device, a parallel connection can create conflicts).
• 🔄 Air firmware update (OTA). Some users complain that updates are slow when both connections are active.

⚠️ Note: If you manually disable mobile data, some system features (such as searching for a network in the background or checking for security updates) may not work properly. For example, a smartphone will stop automatically connecting to known Wi-Fi networks if you are out of range.

How to set up Wi-Fi and mobile Internet on Xiaomi?

If you decide to keep the function active but want to optimize its performance, follow these tips:

1. Set the priority of the network

By default, Xiaomi prioritizes Wi-Fi, but you can change that.

1. Go to Settings → Connections and Sharing → Wi-Fi.
2. Click on the name of your network → «Additionally».
3. Enable the option “Mobile Data Priority” (if available in your version) MIUI).

2. Limit background traffic

To avoid wasting mobile data on unnecessary tasks:

1. Open Settings → Applications → Data Management.
2. Select apps that should not use mobile internet in the background (like YouTube or TikTok).
3. Turn off the "Background Data Transfer" for them.

3. Enable "Traffic Saving Mode"

This option reduces mobile internet usage when Wi-Fi is weak.

1. Go to Settings. → SIM-maps and mobile networks → Saving traffic.
2. Activate the switch.
3. Add to the exceptions applications that are allowed to use mobile data (for example, messengers).

4. Check the developer settings

For advanced users:

1. Activate Developer Mode (click 7 times on “Build Number” in Settings) → The phone).
2. Go to Settings → Additional → For developers.
3. Find the options “Wi-Fi Assist” and “Mobile data always active” – turn them off if you don’t need them.

💡

If you travel frequently, it is recommended to disable Dual Network Acceleration roaming, which will prevent unexpected costs of mobile traffic abroad.

Common Problems and Their Solutions

Sometimes, the parallel work of Wi-Fi and mobile Internet leads to failures, let's look at typical situations and how to fix them:

Problem 1: Internet is slow despite good Wi-Fi

🔹 Reason: Smartphone tries to use mobile data instead of Wi-Fi due to incorrect priority settings.

🔹 Decision:

• Turn off Dual Network Acceleration in the settings.
• Reconnect to Wi-Fi, before “forgetting” the network (Wi-Fi settings) → Additionally. → Forget the net).
• Check if the data saving mode is included in the router settings.

Problem 2: Mobile traffic is being consumed quickly

🔹 Reason: Background apps (e.g. Mi Cloud, Google Play Services) use mobile data even when Wi-Fi is connected.

🔹 Decision:

• Limit background traffic for unnecessary apps (Settings) → Annexes → Data management).
• Turn off automatic sync for Google and Xiaomi accounts.
• Set a limit on mobile traffic in your settings SIM-map.

Problem 3: Smartphone doesn’t switch to mobile data when Wi-Fi goes missing

🔹 Reason: Wi-Fi Assist is disabled or Network Priority is incorrectly configured.

🔹 Decision:

• Check if Auto Switch is enabled in the Wi-Fi settings.
• Update the firmware - in older versions MIUI were switching bugs.
• Reset network settings (Settings → System → Reset → Network settings reset).

Problem 4: A “Do not disconnect mobile internet” notification is constantly appearing

🔹 Reason: Developer mode enabled with the active option “Mobile data always active».

🔹 Decision:

• Turn off this option in Settings → For developers.
• If the notification does not disappear, clear the system cache (Settings) → Warehouse → Clear the cache).

⚠️ Note: If you stop downloading system updates after disabling Dual Network Acceleration, check the boot settings in Settings → The phone. → System Update: Sometimes large files require a stable connection and the smartphone is forced to use both channels.

FAQ: Frequent questions about the parallel operation of Wi-Fi and mobile Internet