My husband and I are having the same problem with our iPhones. This JUST started happening. He has a brand new iPhone 11, and it JUST started happening with my iPhone 6s+ that I've had for years working reliably. He has been on the phone with both apple and Verizon repeatedly, and has been sent new a new phone (obviously not the problem, since my phone has been problematic all of a sudden), and been told that we need a WiFi booster (again, not the problem, since I have full bars and he alternately has full/none AND, I've been operating on data, AND we have Comcast for Internet). What gives??? People can get through to us, and then when we answer or when we call out, nobody can hear us on the phone. Very frustrating.