Why can't I hear or talk on my iPhone 7?

Hi, and welcome to the Apple Community.

Re: Why can't I hear or talk on my iPhone 7?

Wondering if you have:

✽ Updated to the newest iOS : Eg: iOS 15.5 See: About iOS 15 Updates 

✽ Checked all is ok with your carrier

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Else:

Apple support have articles online that may help:

Adjust the Volume on iPhone - Apple Support

If you Hear No Sound or Distorted Sound from your iPhone, iPad, or iPod touch Speaker - Apple Support

If the Microphones on your iPhone aren't Working - Apple Support

All the best :-)