Headphones / audio issues
When I have headphones on, and receive calls on my iPhone 7+, I'm able to hear the callers just fine, but they can't hear me very well, and sometimes not at all. I've checked the User's Guide, my settings, and looked up comments online to try to get a handle on the problem, but I've come up empty. Has anyone else experienced this, and do you have any suggestions as to what I can do to fix it?
iPhone 7 Plus, iOS 11.4