Full screen call on Xiaomi Redmi 9T: how to turn on and configure

Xiaomi Redmi 9T users often face the inconvenience of only displaying a small window with information about the caller during the call, and the rest of the space remains empty. This is the standard behavior of the MIUI shell, which can be changed through both built-in settings and hidden functions. In this article, we will discuss all working ways to make a full-screen call, including methods for different versions of the firmware and solving problems if the settings are not saved.

The thing about Redmi 9T (codenamed lime) is that full-screen call mode depends on the version of MIUI and the phone dealer installed, for example, on global firmware (MIUI Global), the option can be hidden, and on Chinese (MIUI China) it is available by default, and we took these nuances into account and prepared universal instructions.

If you have previously tried to change the display of calls through third-party applications (for example, TrueCaller or Drupe), but the result is not satisfied - do not rush to despair. 90% of the time, the problem is solved by regular MIUI tools, without the need to root the device or install custom firmware.

1. Standard method through MIUI settings

The most obvious method is to activate full screen mode in the phone's settings menu, but not everyone knows where to look for this option. Depending on the version of MIUI, the path may differ, but the general logic remains.

Go to Settings → Applications → Phone. You can find the “Display of Calls” section (or Incoming Call Display in English firmware). In some versions of MIUI, this item is hidden deeper, such as in Settings → System → Additional → Special Features → Display of Calls.

In the menu that opens, select Full Screen Mode (or Full Screen), and if you don't, your firmware doesn't support this directly, then move on to the following.

⚠️ Attention: On Redmi 9T firmware MIUI 12.5 and later, the standard full screen mode may conflict with the pop-up function (for multitasking). If after activation calls start to display incorrectly, turn off pop-ups in the special features settings.

If the call screen hasn't changed after you change your settings, try restarting your phone. Sometimes it takes time for MIUI to apply the new display settings.

2.Use of gestures and hidden commands

Few people know, but Redmi 9T has hidden gestures to control the display of calls, for example, if you swipe down the top of the screen during an incoming call, the call window can turn around the entire screen, which does not work on all firmware, but it is worth a try.

Another way is to use the engineering menu codes, and type the combination in the Phone app:

##4636##

From the menu that opens, select Usage statistics, then search for Phone information, and there may be a Full screen incoming call option, if available, turn it on.

Note: the engineering menu is designed to test the device. Do not change the other settings in this section unless you are sure of their purpose - this can cause malfunctions in the phone.

3. Configure via the "Phone" application

In some versions of MIUI, the full-screen option is not hidden in the system settings, but directly in the Phone app. Open it, click on the three dots in the upper right corner, and select Settings.

Next, go to Incoming Calls, where you can find the following options:

• 📱 Full screen mode - classic display on the full screen.
• 🔄 A pop-up window is a small window that can be moved around.
• 🖼️ Background image - allows you to set your picture for the call screen.

If you don’t have the right option, try updating the Phone app through Google Play Market. Sometimes Xiaomi adds new features through updates to system applications, not firmware.

Make sure that the latest version of the Phone app is installed on the phone

Disable all third-party calling apps (TrueCaller, Drupe, etc.)

Restart your phone before changing your settings.

- Check if the power saving mode is activated (it may block some functions)-->

4. Global firmware solution (MIUI Global)

On the Redmi 9T with global firmware (MIUI Global), the full-screen option is often missing, due to Xiaomi's policy that in some regions the feature is disabled by default, but it can be returned with a little trick.

Download the Activity Launcher app from Google Play, which allows you to run hidden system settings.

1. Open Activity Launcher.

If this method didn’t work, try installing an alternative call app, such as:

⚠️ Note: When using third-party dialers, functions may be lost MIUI, This is something like recording conversations or integrating with Mi Account. Backup your contacts before installing.

5. Manual editing of system files (for advanced)

If all previous methods didn't work, and full-screen mode is critical, you can try changing system files, which requires root rights and is only suitable for advanced users.

With a root-access file manager (such as Root Explorer), follow the path:

/system/csc/others.xml

Find a string with InCallUiStyle and change it to 1 (full screen mode). If you don't have a string, add it manually:

<CscFeature_InCall_ShowIncomingCallUiStyle>FullScreen</CscFeature_InCall_ShowIncomingCallUiStyle>

After editing, save the file, restart the phone and check the result. note that incorrect changes to system files can lead to bootloop ( looped boot), so back up the /system partition before editing.

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If the phone stopped booting after editing others.xml, try resetting the settings via Recovery Mode. To do this, press the Power + Volume buttons up when you turn on the device.

6. Alternative solutions and workarounds

If none of these methods worked, consider alternatives:

• 🔄 Resetting: Sometimes resetting to factory settings helps (but don’t forget to back up!).
• 📲 Activate Developer Mode: Enable Developer Settings (7 times click on Version) MIUI In the phone settings) and find the Force full-screen call option.
• 🔧 Bone firmware: Installation MIUI EU or LineageOS often solves the problem, but requires unlocking the bootloader.

Another workaround is to use automation with the Tasker app, so you can create a task that, when you call in, will turn the window around to the full screen.

1. Install Tasker and AutoInput plugin.
2. Create a profile with a Phone Ringing trigger.
3. Add AutoInput → UI Interaction with the command to deploy the window.

This solution is more complex than others, but it gives you maximum flexibility, for example, you can set up full-screen mode only for certain contacts.

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The most reliable way for most users is a combination of standard settings and the Activity Launcher app. If the phone is warranty, avoid methods that require root or unlock the bootloader.

FAQ: Frequent questions about full-screen calls on Redmi 9T