my siri dosent work when i say hey siri at all whether i restart it or not

Please check the internet connectivity on your device. Siri needs the internet for some commands. Please refer to the pic below (iPhone 12 Pro iOS 16)

Probably your device may not be connected to the internet.

Connecting to Wi-Fi is the first part and then getting connected to the Internet is the second

1. If you are connected to a Wifi, doesn't necessarily mean you are connected to the internet. If you are not connected to wifi could be a problem with iPhone settings or Router/Modem Settings
2. If you are not connected to the internet is the sole issue of Router / Modem Settings. Contact your ISP immediately

Internet Over Wi-FI: Contact your ISP (Internet Service Provider), the agency that provided the Internet Service on your Modem/Router to you

Recommended settings for Wi-Fi routers and access points

For your Internet connection.

• Over Cellular/Mobile: contact your Carrier (Cellular Service Provider). The agency that issued the SIM to you
• Over Wi-Fi: Contact your ISP (Internet Service Provider), the agency that provided the Internet Service on your Modem/Router to you

However --> Connect iPhone to the Internet - Apple Support

The link on top of this page which you had visited, before posting this question here, is shown under the "Related Article” that may have given you an answer.

You need to mention which part of the article was not clear to you.

With the limited information that you have provided, It is hard to even guess the problems faced by you. 

You may get faster and better responses to your query by --> Writing an effective Apple Support Commun… - Apple ...

Please re-post with detail so that someone else can help.

Retrain Siri with your voice

Go to Settings > Siri & Search, turn off Listen for “Hey Siri,” then turn on Listen for “Hey Siri” again. To change Siri accessibility settings, see Use accessibility features with Siri on iPhone.

Change Siri settings on iPhone - Apple Support (IN)

I’m connected