Activate site sound

Greetings eugenio251,

If you aren't hearing the activation beep when addressing Siri, work through these steps:

"Check if "Hey Siri" is turned on

1. Go to Settings.
2. Tap Siri & Search.
3. From here, make sure the following settings are turned on:

• Listen for "Hey Siri"
• Allow Siri When Locked

Set up Siri to recognize your voice

1. Go to Settings.
2. Tap Siri & Search.
3. Turn off Listen for "Hey Siri," then turn it back on.
4. When the Set Up "Hey Siri" screen appears, tap Continue.
5. Say each command that you see on your screen.
6. Tap Done.

If Siri stops responding

1. Go to Settings.
2. Tap Siri & Search.
3. Tap Siri Responses. 
4. Tap Prefer Spoken Responses to hear Siri speak responses, even when Silent mode is turned on." If "Hey Siri" isn't working on your iPhone

If the issue continues, Contact Apple Support for additional guidance.

We hope this helps!

Sincerely.