Siri doesn’t light up. Slow to respond

Re: "When I say hey Siri, she does not light up on the phone".

Wondering if you have "set-up" Siri, or checked whether the settings you want to use are turned on.

Apple support's online article: Use Siri on iPhone - Apple Support

says:

If you didn’t set up Siri when you first set up your iPhone, do the following:

1. Go to Settings > Siri, then tap Talk to Siri.
2. Choose “Hey Siri” or “Siri” (if you have that option).

Note: The option to say just “Siri” is available on supported iPhone models in some languages and regions.

To change additional Siri settings, see Change Siri settings on iPhone.

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Re: I have turned it off and back on and verbalized the start up responses so she recognizes my voice, but it still doesn’t seem to pick up when I say hey Siri, it’s like she’s not hearing it or waking up?

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Trouble-shooting:

If Siri doesn’t work as expected on your iPhone, see the Apple Support article: If Siri isn’t working on your iPhone.

Eg: says how to: "Set up Siri to recognize your voice"

NB: Siri availability, features, and commands varies by language, and country and region.

Learn which Siri features are supported in your country or region.

I just set up Apple Intelligence on my 15 Pro, and for me I had to set up ChatGPT to get the glowing Siri. Hope this helps!