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If we're speaking of an iPhone, if you plug one into a CarPlay receiver then it lightly interrupts the phone use. The iPhone gets a big CarPlay splash screen (which you can dismiss), and switching apps on the car display will also switch them on the phone.

This is changing in the upcoming iOS 13, so the car display and the phone will be much more independent[1]. As someone who's often a passenger with their phone plugged in, I'm happy for this.

[1]: https://www.macstories.net/stories/carplay-in-ios-13-a-big-l...

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