Siri is not working on my iPhone SE post iOS 18 update

Someone in my family had a similar experience and this was resolved by turning Siri off then on again.

This can be done in iOS 18 in Settings > Apple Intelligence & Siri > Talk to Siri > Off

Then Reselect one of the two options:

"Siri" or "Hey Siri"

or

"Hey Siri"

Perhaps resetting this might also get Siri working properly for you?

I’m having a similar issue on iPhone 11 ProMax. Using “Hey, Siri” doesn’t work a lot of the time. Same thing when holding the lock button.

Starting to lag much more now too.