I used to have a 7100r with Rogers. I could hear people fine but I was told that I sounded like craps (sort of the broken McDonalds drive thru speaker thing if you know what I mean?).
I since purchased an 8700r and called Rogers to complain (my 7100r was still under warranty) and they wound up sending me a new 7100g. Even though your friend gave it to you, perhaps if it is still under warranty you can get Rogers to replace it? If not, I've got a 7100g for sale.