IPhone 7 headphone jack not working

Check for debris, damage, or loose connections

1. Check for debris in the headphone port on your iPhone, iPad or iPod touch.
2. Check your headphone cable, connector, remote, and earbuds for damage, like wear or breakage.
3. Look for debris on the meshes in each earbud. To remove debris, gently brush all openings with a small, soft-bristled brush that's clean and dry.
4. Firmly plug your headphones back in. If your iOS device has a case, remove the case to get a firm connection.

If your headphones still aren't working, follow the steps below for your issue

Consulting this might also help

If your headphones don't work with your iPhone, iPad, or iPod touch - Apple Support

Does your headphones work with other iPhones or other headphones work with your iPhone?

My iPhone 7+ has an issue where the mic does not work at all. Similarly , you can charge it but not plug in a wired mic. Are you able to speak into the phone for a phone call or voice memo? The only way to speak on a call or voice memo or to Siri is by Bluetooth.

I have not figured it out but am going to try downgrading to the original iOS that came on iPhone 7 b/c it seemed to happen right after an iOS update..