I can generally speak to my iPhone and have it recognize and carry out what I say when it's still in its holster on my hip. Anything that's set up in HomeKit i

I can generally speak to my iPhone and have it recognize and carry out what I say when it's still in its holster on my hip. Anything that's set up in HomeKit is directly accessible through Siri, and IME most smart-home devices these days support HomeKit, even if they have their own apps as well. So I don't need to have any app open, or my phone unlocked or even in my hand, in order to turn on and off the smart outlets I have in my house. (That said, I also have a HomePod mini, because not everyone in my house keeps their phone on their person at all times—plus it's a nice speaker for the kitchen.)