I am on my 3rd IPhone 13, same issue: When I am at work & on the phone, I can only hear people occasionally. People on the other end can hear me just fine. Reception goes in & out & it crackles. I have walked out of the building & still have the reception issue. Once I get in my car & drive away, the issue is resolved. I have spent over 24 hours throughout the last 3 weeks on the phone or messaging Verizon regarding the issue. It's not the phone since I'm on #3. My iPhone 10 worked just fine. I've changed settings to no avail. Any help would be greatly appreciated. I'm to the point where I may change carriers.