What the Action Button Does and How to Reach It

The Action Button on iPhone 16 is the customizable button on the right side of your phone, below the volume controls. By default it opens the flashlight, but you can change it to launch any of dozens of built-in features — voice memos, camera, focus modes, shortcuts, accessibility tools, and more. You reach the settings through the Settings app, not through any special menu.

The button works the same way whether you press it once or hold it down. When you change what it does, you are choosing a single action for both press types, or you can set different actions for a quick press versus a long hold if you want more control.

Key Takeaways

  • Open Settings, tap Buttons, then select Action Button to see all available options.
  • You can assign any single action to the button, or set different actions for a quick press and a long hold.
  • Built-in options include flashlight, camera, voice memos, focus modes, shortcuts, and accessibility features like magnifier or sound recognition.
  • Custom shortcuts you have created in the Shortcuts app will appear in the Action Button menu if you have set them up.

Steps to Change the Action Button Through Settings

Open the Settings app on your home screen. Scroll down and tap Buttons — it appears in the middle section of the settings list, below Display & Brightness and above Sounds & Haptics.

Tap Action Button. You will see a list of every action available. Scroll through to find what you want — the list includes Flashlight, Camera, Voice Memos, Magnifier, Translate, Accessibility Shortcut, Focus, Shortcuts, and others. Tap the action you want. The button is now set to that action and the menu closes automatically.

Test the button by pressing it once. It should launch whatever you chose. If you want to change it again, go back to Settings > Buttons > Action Button and pick something different.

Setting Different Actions for Press and Hold

If you want the button to do one thing when you press it quickly and something different when you hold it down, you need to use the Shortcuts app instead of the basic Settings menu. This requires creating a custom shortcut first.

Open the Shortcuts app (it comes pre-installed on iPhone 16). Tap the plus icon to create a new shortcut. Build the action you want — for example, "Turn on flashlight" or "Open camera". Name it and save it. Repeat this for a second shortcut if you want a different action for the hold.

Go back to Settings > Buttons > Action Button. At the top of the list you will see your custom shortcuts. Tap the one you want for the press action. Unfortunately, the standard Settings menu does not let you assign a separate hold action — you can only set one action total through Settings. To use different press and hold actions, you must set the button to one of your custom shortcuts, and that shortcut can contain logic to detect whether it was a quick press or a hold, but this requires more advanced shortcut building.

Common Actions and What They Do

Flashlight turns your rear camera flash on and off. Camera opens the camera app directly to photo mode. Voice Memos starts a new recording when ready. Magnifier enlarges text and objects on screen, useful for reading small print.

Focus lets you switch between your focus modes — Work, Personal, Sleep, Driving, and any custom ones you have created. Accessibility Shortcut opens a menu of accessibility features like VoiceOver, Zoom, or Sound Recognition. Translate opens the Translate app. Shortcuts lets you run any shortcut you have built in the Shortcuts app, including multi-step automations.

If you use a particular feature many times a day — voice memos for quick notes, the magnifier for reading, or a specific focus mode — setting it to the Action Button saves you from digging through menus.

Resetting the Action Button to Default

If you want to go back to the original flashlight setting, open Settings > Buttons > Action Button and tap Flashlight. There is no "reset to default" button; you straightforward choose Flashlight again and it returns to the factory setting.

You can change the Action Button as many times as you want with no penalty. There is no limit to how often you switch it.

Troubleshooting When the Button Does Not Work

If you press the Action Button and nothing happens, first check that you have actually saved your choice. Go back to Settings > Buttons > Action Button and confirm that your chosen action is still selected — sometimes the change does not stick if you close Settings too quickly.

If the button itself feels stuck or unresponsive, restart your phone by holding the side button and one volume button until the power-off slider appears, then slide to power off. Wait a few seconds and turn it back on. If the button still does not respond, it may be a hardware issue and you should contact Apple Support or visit an Apple Store.

If you set the button to a custom shortcut and the shortcut does not run, open the Shortcuts app and tap the shortcut to run it manually. If it fails there too, the shortcut itself has an error — check that all the steps are correct and that any apps it calls are installed on your phone.

Frequently Asked Questions

Can I set the Action Button to open a specific app?

Not directly through the Settings menu — the built-in options are limited to the actions listed in Settings > Buttons > Action Button. However, you can create a shortcut in the Shortcuts app that opens any app, then set the Action Button to that shortcut. This gives you the same result.

What happens if I press the Action Button by accident?

Whatever action you set will run. If you set it to flashlight, the light turns on. If you set it to camera, the camera app opens. You can close it the same way you would close any app or feature. There is no way to lock the button or require confirmation before it runs.

Can I use the Action Button to control smart home devices?

Yes, if you have set up HomeKit or another smart home system. Create a shortcut in the Shortcuts app that controls your devices, then set the Action Button to that shortcut. For example, you could create a shortcut that turns on all your lights or adjusts your thermostat.

Does the Action Button work the same way on all iPhone 16 models?

Yes. iPhone 16, 16 Plus, 16 Pro, and 16 Pro Max all have the Action Button in the same location and with the same settings options. The process to change it is identical on all models.

What if I want the button to do nothing?

You cannot disable the Action Button entirely — it must be set to some action. However, you can set it to an action you rarely use, or create a blank shortcut that does nothing and assign that to the button. A blank shortcut will run and close without performing any visible action.