Holding down the side button is one of the fastest ways to summon Siri on an iPhone. Apple now plans to open that shortcut to third-party assistants, but only in Japan.
The update was first found in the code for iOS 26.2 beta and later confirmed by Apple in a set of instructions for developers.
“In Japan, people might place an action on the side button of iPhone that instantly launches your voice-based conversational app,” reads the document. “People expect the voice-based…

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