[jamilton]

Siri does have a setting that'll activate it if you say "hey siri" while the phone is locked. Obvious privacy and battery usage concerns though, and it's still Siri, so it's a little clunky.

[jwr]

Mhm. I think I use that. But then I say "call my wife" and it says "you'll need to unlock your iphone first".

It's clear Tim Cook doesn't ever try to use Siri wearing gloves. Or ever, for that matter :-)

[mft_]

Siri (on iOS 18, at least) will call people for me without unlocking, in response to a voice command only - I just double-checked...