How to set up a call with a button on Xiaomi smartphones: full instruction

Answering calls with a physical button on Xiaomi’s smartphone is a convenient feature that saves time and eliminates the need to unlock the screen. It is especially relevant for owners of devices with a Bixby button (in Mi 10T models, POCO F3), side keys or programmable triggers. However, not all users know that this option can be flexible to customize to their needs, from simply answering a call to launching a voice assistant or activating a camera.

In this article, we’ll look at all the ways you can customize your Xiaomi button response, including hidden MIUI features, model differences, and typical problem solving: how to tie action to physical keys, customize gestures, or use third-party apps for advanced control, and why the feature may not work on some devices and how to fix it.

What Xiaomi models support a button call response

Not all Xiaomi smartphones allow you to answer calls using physical buttons, depending on the hardware configuration and version of MIUI.

• 📱 Programmable button: models with a separate Bixby key (Mi) 10T, POCO F3, Redmi K30 Ultra) or side buttons that can be reassigned.
• 🔄 Version. MIUI 12 and above: older firmware features are either missing or unstable, with the exception of the Mi 9 and Mi 10 flagships, where support came later through updates.
• 🔧 Availability of proximity sensor: on some budget models (Redmi) 9A, POCO M3) The function may be disabled due to hardware limitations.

Below is a table with popular models and their support function:

Important: On Android One devices (such as Mi A3), the button response function may not be available due to the limitations of the stock firmware, in which case only installing custom MIUI or using third-party apps will help.

Method 1: Configure through “Special Opportunities”

The most reliable method is to use the built-in MIUI tools, which works on most supported models and does not require root rights.

1. Open Settings → Special Options → Universal Access.
2. Select the Physical buttons (on some models – button settings).
3. Slip on the option Answer to the call (or Action on pressing).
4. Specify the button you want to use (such as the Bixby button or Volume Up).
5. Save the settings and check the work.

If your menu doesn’t have a call answer option, try an alternative route:

Settings → System → Gestures → Call response button

Limitations of the method:

• ⚠️ On some models (Redmi Note 8 Pro) the feature is only available for the power button, which can lead to accidental resets.
• ⚠️ If the button is already used for another action (for example, calling a voice assistant), it will have to be reassigned.

Check out the MIUI version (should be 12+)

Make sure the button is not blocked

Turn off the battery's economy mode

Reboot your phone before setting up-->

Method 2: Using gestures with volume buttons

If your model doesn’t support direct response with a button, you can adjust the combination with volume buttons, which works even on budget devices (Redmi 9C, POCO M4 Pro).

Instructions:

1. Go to Settings → System → Gestures → Button gestures.
2. Select the Call Answer (or Retention Action).
3. Assign a combination, for example: 🔊 Holding the volume button + single-press. 🔇 Double pressing of the volume reduction button.

Save it and test it.

Advantages of the method:

• 🔧 It works on most models, including those without programmable buttons.
• 🛡️ Minimum risk of accidental triggering (conscious action required).

Disadvantages:

• ⏱️ The combination can be triggered more slowly than one press.
• 🔕 False positives may occur in your pocket or bag.

Swipe on screen

Physical button

Volume button gesture

Voice assistant

Another option-->

Method 3: Third-party applications for advanced settings

If the built-in MIUI is not suitable, you can use third-party utilities that allow you to assign a call response to any buttons, including those that are not normally supported by the system (for example, the camera button on POCO X3).

Top.-3 applications:

The following is the Button Mapper:

1. Install the application and provide all necessary permissions (including Special Features).
2. Select the button you want to reassign (like Bixby or Volume Up).
3. In the Single Press section, select Answer Call.
4. Save your profile and restart your phone.

⚠️ Note: On some models (Xiaomi) 11T) Button reassignment applications may conflict with system services. If after setting up the phone starts to brake, turn off the background operation of the utility in the battery settings.

💡

If the app doesn’t see the Bixby button, try disabling it in the standard settings (Settings → Applications → Bixby → Disable).

Problem Solving: Why the Button Answer Doesn't Work

If you have set up a call answer with a button, but the function does not work, check the following points:

• 🔋 Economy Battery mode: Some models (Redmi Note 9) block background system services.
• 🔄 Conflict with other gestures: If you have a double press on the power button for the camera set up, it may interfere with your answer to the call.
• 📱 Update MIUI: After major updates, the settings may be reset. → The phone.
• 🛠️ Button damage: physical keys wear out over time. Test the button in other scenarios (e.g., to adjust volume).

Diagnosis of malfunctions:

Critical information: On devices with Android 12+ and MIUI 14 The button response function may be blocked due to new security policies, in which case only the firmware rollback or use of the button will help. ADB-commands for forced reassignment.

Additional chips: what else can be customized

Answering a call isn’t the only action you can tie to buttons, and other useful features are available on Xiaomi:

• 🎤 Quick Voice Assistant Start: Double-clicking the Power button or Bixby can open Google Assistant or Alice.
• 📸 Instant camera start: On most models, double-pressing the power button activates the camera even if the screen is locked.
• 🔇 Fast-Switching Off: Holding the Volume Down button can put the phone into silent mode.
• 🔄 Switching profiles: on some devices (Xiaomi 13) you can assign a button to change the modes Work / Home / Outdoors.

How to set up the camera launch button:

1. Go to Settings → Screen Lock and Password → Quick Camera Start.
2. Turn on the option and select a button (usually a power button).
3. Test: Double tapping on a locked screen should open the camera.

On models with an infrared port (POCO X3 NFC), the button can be programmed to control household appliances. This will require the Mi Remote app and settings in Settings → Connected devices → Infrared port.

💡

On devices with AMOLED-With screens (such as Xiaomi 12 Pro), holding the volume button during a call can activate the Always-on Display mode with information about the caller.

Security: How to Avoid Accidental Pressing

Setting up a call with a button is convenient, but it can cause false positives, such as a button in your pocket or bag that might get snagged, leading to an unsolicited call being answered, to avoid this:

• 🔐 Use combinations: instead of single pressing, assign double or hold. + push.
• 📵 Turn off the function in certain situations: MIUI There is a Do Not Disturb option that can block the response with the In-pocket button.
• 🛡️ Set exceptions: in Settings → Annexes → Phone. → Permissions can be limited to function for unknown numbers.

Example of exception settings:

1. Open Settings → Calls → Blocking and Identification.
2. Add spam numbers or unknown contacts to the blacklist.
3. Enable the option to block the response with the button for blocked numbers.

⚠️ Note: On devices with hybrids SIM-cards (for example, Redmi Note 11) the response button can only work for the main SIM. For the function to work for both cards, you need to manually duplicate the settings in Settings. → SIM-maps and mobile networks.

FAQ: Frequent questions about setting up