This could be an AT&T issue. I'm not sure. But frequently, when I'm on a call, the other person suddenly can't hear me, even though I can hear everything they're saying just fine. That's why I'm not sure it's a service issue. If the call were getting dropped or going out, it seems I wouldn't be able to hear them either. But the problem is only one way.
“On a call, the other person suddenly can't hear me even though I can hear them fine. This could be an AT&T issue. I'm not sure. […]But the problem is only one way.”
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Troubleshooting iPhone Audio:
Save a Few. You might need to get a new speaker or microphone. But, before making that assertion, see if you can use the following links to troubleshoot this...
A Few Links that May Help:
Is the issue happening at home or when you’re mobile and away from WiFi? Do you have WiFi Calling enabled?
On a call, the other person suddenly can't hear me even though I can hear them fine.
