Q: my siri can't hear me

Hi!

I have the same problem, my iPhone is now at Apple they told me that they'll send me a new one, i'm waiting to receive it in the next days!

contact Apple

Try the steps in these articles:

https://support.apple.com/en-us/HT203794

Use Siri on your iPhone, iPad, or iPod touch - Apple Support (last part of this article has troubleshooting steps)

Also make sure that there is no dirt or debris in the headphone jack. Try using siri with headphones.