I was on the call for the duration, except for a couple of minutes when my cell phone signal faded. I also muted my phone.

It wasn't so much an echo problem for me as it was the difficulty in having only one person talking at any given moment. The problem is that it's hard to know when you won't be talking on top of someone else. But during those moments when just one person talked, it was clear as a bell.

Too bad the forum doesn't have a chat room for this kind of stuff.