I’m sorry I missed your reply with the thorough evaluation of apps we know create conflicts.
If you are in a call with echo and you move to speakerphone and back to the normal microphone, does the echo return?
Likewise, if you move to cell then back to WiFi does the echo return?
Did the problem start only recently, or has it been a problem since you began using the phone?
Is the phone fully updated for Android and system apps?
I don’t have the S10 handy, so I’m not sure what options are available on your phone, but here are some things to look for:
- Open the phone app and tap the three-dot menu icon at top, right. Tap Settings. Make sure Wi-Fi calling is disabled (to the left and gray.)
- From that same menu, tap Other Call Settings (or Additional settings) - have you ever enabled Hearing aid compatiblity? If so, try testing with it disabled to see if it makes a difference.
- In this same settings menu as idea # 2, if you see “Noise Reduction” make sure it’s disabled.
- Could you try covering the noise-canceling microphone while you’re in a call where echo is present, and see if that clears up the echo?
A couple of other suggestions I’ve seen online include clearing cache and data on the Bixby app (do you ever use Bixby?) and resetting network settings. Please note that resetting network settings will clear all your saved WiFi networks.