Currently Being ModeratedJan 12, 2013 5:03 PM (in response to olesalt)
I've never heard of the "well known echo problem", and I've had a 4S for 18 months.
Anyway, this is a user forum; Apple does not read or respond here. Have you tried asking Apple directly, either at an Apple store, online chat, or telephone support.
Currently Being ModeratedJan 12, 2013 5:05 PM (in response to olesalt)
Haven't heard of anything like that, much less a "well known and documented" problem like that.
Echo can usually be attributed to the cellular carrier. Normally, disconnecting and calling back will clear it up.
As for Apple's response, you'd have to ask them. No one here can speak for Apple, and since there is nothing published by Apple on the matter, nothing can be said.