People can't hear me when talking on the phone of my iPhone 7

I have this issue as well. I have AT&T.

Here's what I've done:

1. Tested that this happens with and without noise cancelling enabled. With and without Wi-Fi. With and without a case on. With and without speakerphone. With and without headphones. Multiple geographic locations. Multiple callers. Toggling speakerphone doesn't fix the issue when it's happening. Removing headphones doesn't fix the issue when it's happening. Moving the phone around (to get better signal) maybe help, but I don't have enough data to prove this isn't coincidental. This issue started for me before the 10.0.3 release, basically within a week of purchasing the phone.
2. Apple store reset my network settings and gave me a new SIM card, which I then went to AT&T to activate. Issue continued.
3. Apple store gave me a new phone. Issue continued.
4. Apple store told me not to backup from iCloud, so I reset my phone and set it up as a new phone (not using iTunes). Issue continued.
5. Apple store told me to reset phone using iTunes and set up as new phone. Issue continued.
6. Apple store told me to try disabling LTE voice (forces 4G voice). They suspect that my reception was poor (I rarely ever get more than 2 of 5 bars in general) and that the LTE signal was dropping mid-call. Call quality was poor when I swapped to 4G, so this is not a viable solution for me. I re-enabled LTE voice before I could do extensive testing. Issue continued.
7. I enabled Wi-Fi calling to try something else, but it never actually enabled (I never saw the AT&T Wi-Fi on the top of my phone).
8. I called Apple support and they think it's a problem with "AT&T provisioning", but had me generate logs for them to analyze. They also suggested Wi-Fi calling, but I told them it wasn't working. While on the phone with them, the issue happened, they couldn't hear me and I could hear them.
9. AT&T Wi-Fi finally showed up while I was on Wi-Fi, days after enabling it. However, this functionality is intermittent and doesn't always enable when I'm on Wi-Fi.
10. Followup call with Apple support, they downloaded my logs and are analyzing.
11. I called back a week or so later, left a message, no response in 4 days. Will try again.

Thank you for being so thorough. I hope it can be figured out.

Thank you for all of the details. I'm having this same problem too. What a huge pain in the ***. Apple needs to find a fix for us ASAP. We have phones that don't work. That's not right.

Any update on this issue. I am having the same issue. At the start, the conversation starts fine but during a call, within 1 or 2 minutes the other side can't hear me anymore. I checked all setting even reset my iPhone, but still having this issue.

I went through the same thing. Got a new iPhone 7. People couldn't hear me but I could hear them. Apple gave me a new phone and I'm having the same issue. So I'm paying 750.00 for a phone I can't even use. I never had this problem with any other I phone I owned. Apple has no idea how to fix the issue. What a waste of my hard earned money.

I agree I'm so frustrated that I can't use my phone

They finally changed my SIM card. Now it works fine

For me, it was Network issue with EE. They have sorted the issue now and my phone works just fine again.

What is EE?

I'm not sure how the SIM card fixed it but it did. You can get bad ones that I guess can cause other problems. I went to apple 4 times before they finally changed it.

Same issue with 2 phones in my house. So annoying! Following this thread and hoping Apple fixes this fast!!

I am having same issue phone is 3 days old and not working during calls on receivers end soooo frustrating !!

what model and how do I find the model