Sorry for the delay. Took awhile to figure out how to sign up - then there was the "progressive" ad to confirm account that looked suspicious. I'm using the Bose QC20 for android. I checked the url above and followed the instructions. Did a test call to another number and there was no echo. Redialed the number of the company that I noticed the problem and the echo persists. They say they use a headset . So maybe the problem is on their end? Is there something I can have them do to eliminate the echo?