How to make the Action Button open an app. Ian Carlos Campbell for Engadget. If you'd like to get a little more adventurous, you can also have the Action Button open a specific app on your phone.

It’s a new “Action button” that sits on the side of the iPhone 15 Pro, exclusively, and is able to summon a single specific command of the phone-owner’s choosing.

The new iPhone 15 Pro lineup offers a lot to get excited about: They’re slimmer and thinner, the new cameras are professional-grade and the switch to USB-C charging will make your life easier.

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