YEs, it annoys me to no end. My landline is transfered to my cell phone due to some issues with the actual phone at home, and i never know when the call my cell or my home. I started using Nomorobo with my land line and some of those calls have stopped, the ones that come in I either ignore or if I answer I just hang up adn block the number. But it is very difficult to know, I was looking to work recently and i never new when the call was work related, always answered now I just ignore them.
I have also notice that the calls come from phone numbers that start like mines area code 339 or area code 615 and then a different number, I guess they want you to think that someone you know is calling you. Very annoying