Have you talked to Verizon?
Hopefully a fix is in the worksYes. They said they have received other calls regarding the exact same issue and hopefully an upcoming software update will fix it. I will believe it when I see it. Also spoke to Samsung and they said they are also aware of the issue.
Thanks for updatingFinally after months of troubleshooting this problem I think I stumbled upon what is causing the Wi-Fi echo problem. It happens after I make a Duo video call. I do not know what the solution is but at least I know that after a Duo video call the Wi-Fi echo will reappear. Right now the only solution is to reboot the phone after I get off a Duo video call.
Strange maybe report to SamsungProblem finally solved. Turn off the Samsung video call effects and reboot. The WIFI echo calling problem will be gone never to return!!
I started having this issue on WIFI CALLING using speakerphone on the s21 plus on the Verizon network the moment I switched to ATT fiber. I never had this issue on Comcast. When switching providers I still had like 1 week with Comcast. I would put the call on speaker and connect to the modem/router I personally bought for comcast. Echo gone. Same calls, I would switch to ATTs fiber modem/ router and instantly they would complain of the echo until I turn off Wi-Fi and the call reverts to cell.
The only difference between my old modem/router and the ATT one, is the att is wifi6 while the other one was wifi5. I am not sure if that does something to the call. I would like others to confirm of the echo issue by connecting to different wifi's (wifi 5 vs wifi 6, coax vs fiber) and seeing if it fixes it or not. Weird I know but that was my observation so far.
Are your Samsung video call effects on or off? It they are on turn them off and reboot and keep them off. The echo on your caller's end will go away.