How to make a full-screen call on Xiaomi Redmi 9: full instructions with nuances

Introduction: Why you need a full screen call mode

Owners of Xiaomi Redmi 9 often face the inconvenience: an incoming call is displayed by a small window at the top of the screen, especially if the phone is unlocked. This prevents you from quickly accepting a call, especially in motion or in bright sunlight. Full-screen mode solves the problem - it increases the incoming call interface to the maximum size, making the Accept and Reject buttons more noticeable.

However, in standard MIUI settings, this feature can be hidden or disabled, depending on the firmware version and regional features, the activation paths differ, and in this article we will discuss all working methods, from basic settings to hidden developer parameters.

It is important to note that the Redmi 9 is a model. M2003J15SC) Full-screen mode may not work properly with some shells from carriers (for example, MTS Connect or Beeline Smart).If after settings the problem remains - check the version MIUI and availability of updates.

Method 1: Standard settings of the phone

Let’s start with the simplest method, the MIUI settings menu, which works on most firmware versions, including MIUI 12/13/14 for Redmi 9.

Open the Settings app (the gear icon on the home screen) and go to the Applications → Application Management section. In the search bar, type in your Phone and select the system app Phone (not to be confused with Contacts!).

1. Slip it on the Permit. → Additionally.
2. Find the Display option on top of other windows and activate it.
3. Go back and select Notifications → turn on the Show Notifications switch.
4. Scroll down to the Notification Style section and select Full-screen Mode (or Deployed View in some versions).

If there is no Full Screen mode, your version of MIUI requires an alternative approach (see the following methods) and check if there are third-party launchers (such as Nova Launcher or POCO Launcher) that can block system settings.

Check the version of MIUI (Settings → About the phone)

Remove third-party launchers (if any)

Update the Phone app in Google Play

Reboot your phone before settings-->

Method 2: Developer settings

If the standard method didn’t work, try activating hidden developer settings.This is a one-stop-shop for all Xiaomi models, including the Redmi 9, Redmi Note 9, and other MIUI devices.

First, turn on the developer mode:

1. Go to Settings. → The phone.
2. Tap 7 times on the MIUI version (you will be notified "You became a developer!").
3. Return to the main settings menu and open a new section → For developers.

Now find the parameters associated with the display:

• 🔍 Debugging by USB — Include (optional, but sometimes affects system processes).
• 📱 Do not turn off the screen during the call - activate.
• 🖥️ Forced Full Screen Display – Select Your Phone from the App List.

After you apply the changes, restart the device. If the full screen mode is still not working, check if it conflicts with Game Turbo or Second Space functions (if activated).

Method 3: Resetting the settings of the "Phone" application

Sometimes problems with displaying calls arise due to cache failures or system application data.

Follow the following steps:

1. Open Settings → Applications → Application Management.
2. Find the phone app and tap it.
3. Select Warehouse → Clear cache and Clear data.
4. Confirm the action (this won’t delete your contacts or call history!).

After reset, check if full-screen mode has appeared. If not, reinstall updates to the Phone app via Google Play (even if it is system-based, updates are sometimes available).

⚠️ Note: On some firmware, a reset of the application Phone may cause the call history to disappear. Pre-export it to the file via Settings → Google → Backup.

Method 4: Third-Party Apps for Full-screen Calls

If system methods don't work, use third-party utilities to intercept incoming calls and display them in full screen size.

Recommended applications (checked on Redmi 9):

• 📞 Full Screen Caller – supports customization of the interface (button color, background image).
• 🔄 Truecaller – in addition to the number determinant, has the option of full-screen display.
• 🎨 Call Flash – adds animation and vibration when incoming call.

Install one of the apps from Google Play, give it permissions to read call logs and display on top of other windows. In the utility settings, activate the Full Screen Mode or Maximize Call Screen option.

The disadvantage of the method is the additional battery consumption (applications work in the background) and possible conflicts with MIUI system services. Before installing, check the reviews of Redmi 9 users on the application page.

Standard phone.

Truecaller

Full Screen Caller

Other

I don't use third-party.-->

Resolving common problems

Even after you set it up properly, full screen mode may not work properly. Let's look at common errors and their solutions.

If the problem is not resolved, check if there are ad blocking apps on the phone (such as AdGuard or Blokada) that can filter system notifications, including the call interface. Add the Phone app to the exceptions.

⚠️ Attention: On firmware MIUI Global Stable version below 12.5.3 Full screen mode may not be supported due to manufacturer restrictions. → Update the system or install custom firmware (for example, Xiaomi.EU).

Additional settings for convenience

Full screen mode is only part of optimizing the call interface, and set these settings for maximum comfort:

• 🔊 Volume of the call: Increase it in Settings → Sound. → Media Loudness (Affects the Melody of the Call).
• 🌙 Dark theme for calls: Activate in Settings → Screen. → Dark mode (reduces the load on the eyes).
• 📶 Network Priority: For stable communication, select Settings → SIM-maps and mobile networks → Preferred type of network → 4G.
• 🔄 Vibration when calling: Configure in Settings → Sound. → Vibration when ringing (useful in noisy places).

For users with hearing problems, MIUI has a feature called Sound Amplification (includes in Settings → Special Options → Hearing) that increases the volume of the voice of the interlocutor during a conversation.

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If you make frequent calls with headphones, activate the option to automatically switch to the speaker when disconnecting the headphones in the settings of the Phone application. This will eliminate the need to manually switch the audio output.

FAQ: Answers to Frequent Questions

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On Xiaomi Redmi 9, full-screen call mode depends on the MIUI version and regional firmware. If standard methods don't work, use third-party apps or update the software to the latest stable version.