How to Make a Full Screen Call on Xiaomi with MIUI 12:5 Proven Ways

Xiaomi’s full-screen incoming call mode with MIUI 12 is not just an aesthetic solution, but a practical feature that helps keep an important call out. Unlike the compact notification at the top of the screen, the deployed interface takes up the entire display, showing the subscriber’s name, contact photo (if any) and large font control buttons, especially for users with vision problems or those who often use a smartphone in noisy places.

However, not all owners of Redmi, Poco or Mi devices know that the default full-screen call feature can be turned off or hidden in the depths of settings. Moreover, depending on the phone model and firmware version, the path to activation may differ. In this article, we will discuss all available methods, from standard system settings to hidden commands for power users.

Importantly, MIUI 12 (and its modifications like MIUI 12.5 or MIUI 12 Enhanced) has multiple versions of the interface for different regions, for example, global firmware (MIUI Global) may lose some features compared to Chinese (MIUI China), we will take these nuances into account and offer universal solutions.

1. Standard method: phone settings

The most obvious way is to take advantage of the built-in system settings, which works on most Xiaomi devices with MIUI 12 and does not require superuser rights or additional applications.

Open the Settings menu (the gear icon on the home screen) and follow the following steps:

• 📱 Go to the Appendix section → Application management.
• 🔍 In the search bar, type in “Phone” and select the standard calling app (usually called Phone or Contacts).
• 🛠️ Click on Notifications → Incoming challenges.
• 🔄 Activate the Full Screen Mode (or Show Full Screen in some versions).

If there is no such item, try an alternative path:

1. Launch the Phone app.
2. Tap it on three points (⋮) top-right → Settings.
3. Select Incoming Calls → Notification style.
4. Install the Full Screen option.

On some models (for example, Redmi Note 10 Pro or Mi 11), the option may be called differently: Display as a pop-up – in this case, it must be turned off so that calls occupy the entire screen.

Hidden MIUI settings: codes and engineering menu

If the standard method didn't work, it's possible that the function is blocked by the manufacturer for your region, in which case an engineering menu or special menu will help. USSD-Careful: Incorrect actions on the engineering menu can disrupt the phone!

First, try a universal code to activate full-screen calls:

##4636##

Once you enter, the test menu will open. Select Usage statistics → find the Phone app and reset it. Then reboot the device and check if full-screen mode has appeared.

For a deeper setup:

1. Enter the code ##36446337## (opens EngineerMode).
2. Go to MTK Settings → Telephony.
3. Find the Incoming Call Settings option.
4. Set Full Screen Mode to Enabled.

⚠️ Attention: Changes to the engineering menu may cause a failure of the communication module. If after manipulations the network signal is lost or calls stop working, reset the network settings in Settings → SIM-maps and mobile networks → Resetting network settings.

3.Use of ADB-Teams (for advanced users)

If previous methods have failed, and full-screen mode is critical, you can resort to ADB (Android Debug Bridge), which requires connecting the phone to a computer and basic knowledge of working with the command line.

First, activate the debugging over USB:

1. Go to Settings. → The phone.
2. Tap 7 times on the MIUI version to unlock Developer Mode.
3. Go back to the basic settings → Additional → for developers.
4. Activate Debugging on USB.

Now connect your phone to your PC, install ADB drivers and execute:

adb shell settings put global incoming_call_fullscreen 1

If the team doesn’t work, try an alternative:

adb shell am start -n com.android.server.telecom/.settings.IncallSettingsActivity

This will open up hidden call settings where you can manually enable full-screen mode.

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If so, ADB-The commands the phone has stopped responding to incoming calls, execute the command adb shell settings delete global. incoming_call_fullscreen, to reset the change.

4. Third-party applications for call management

If MIUI 12's built-in tools don't allow full-screen activation, third-party apps will come to the rescue, not only solving the display problem, but also adding additional features: recording conversations, blacklisting, customization of the interface.

The best options from Google Play:

• 📞 Truecaller – detects spam calls and supports full-screen mode (setting in Settings) → Incoming challenges → Notification style).
• 🔄 Google Phone – standard application from Google with flexible display options (requires installation as the default apps).
• 🎨 ExDialer – allows you to adjust the size of the incoming call window, including full screen mode.
• 🔧 Drupe – combines contacts and calls with the ability to customize the interface.

Before installing a third-party application:

1. Make a backup of your contacts (e.g., via Settings → Google → Backup).
2. Turn off battery optimization for the new app (Settings → Apps → Permissions → Battery Optimization).
3. Install it as the default app for calls.

⚠️ Note: Some apps (such as Truecaller) require access to contacts, call history, and SMS. Check Google Play permissions and user reviews before installing – there’s a risk of data leakage.

5. Problem Solving: Why Full-screen Mode Doesn't Work

Even after all the manipulations, full-screen calls may not turn on, so let's look at the typical causes and ways to fix them.

If the problem persists, try resetting your network settings:

1. Settings → SIM-maps and mobile networks → Resetting network settings.
2. Reboot the phone.
3. Check the call.

6. Alternative solutions: themes and launchers

If none of these methods worked, you can go around the corner, change the theme or install an alternative launcher, and some of the themes for MIUI 12 have built-in styles for full-screen calls.

How to set the topic:

1. Open the Themes app (brush icon on the home screen).
2. In search, type in “full screen call” or “full screen calls”.
3. Choose your favorite topic and apply it.
4. Reboot the phone.

Popular launchers with support for customization of calls:

• 🌈 Nova Launcher – allows you to change the size of notifications, including calls.
• 🔄 Action Launcher – has built-in settings for the call interface.
• 🎭 Microsoft Launcher – Supports Call Management Plugins.

Important: Some themes may conflict with system applications, causing freezes or errors. Before installing, check the theme compatibility with your version of MIUI (this information is usually indicated in the theme description).

7 MIUI Update: When to Wait for the Official Fix

If full-screen call mode previously worked but stopped showing after the update, the problem could be a firmware bug. Xiaomi regularly releases patches for MIUI 12 that fix similar bugs.

How to check for updates:

1. Settings → About the phone → System update.
2. Press three points (⋮) → Download the latest version.
3. If an update is available, install it and restart the phone.

If there are no updates, but the problem is relevant, you can:

• 📝 Leave feedback through the application Feedback (Settings) → Feedback).
• 🌍 Switch to beta version MIUI (risky, but sometimes helps).
• 🔄 Manually flash a more recent version through Fastboot or Recovery.

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Before manual firmware updates, be sure to back up data via Settings → Additional → Backup and Reset. Mismatch between the MIUI version and the phone model can cause the device to “break down.”

FAQ: Frequent questions about full-screen calls on Xiaomi