Microphone icon voice function not working

Hello, gearly. Thank you for posting your question to the Apple Support Communities. 

We understand that the iOS Dictation features do not appear to be working as expected with your iPhone. We are happy to help you here and find a solution as we know this feature must be important to you. 

If you notice this happening while your iPhone is connecting with cellular data, it may be necessary to confirm that iOS has access to use cellular data. You can manage this access in the Settings app on your iPhone. 

The following Apple Support articles can help you with this as well: 

Dictate text on iPhone - Apple Support

View or change cellular data settings on iPhone - Apple Support

We hope that this information provides you with the solution that you need. 

Cheers!

gearly,

Thanks for following up with the screenshot. If you haven't already, restart your iPhone. This simple step can reset connection and resolve many unexpected behaviors. Restart your iPhone - Apple Support

If the issue persists, let us know if this behavior occurs when using headphones. Be sure to include any other steps that you may have tried.

Have a nice day!