My DH read some place that if you start hitting the # or the * quickly while they are talking, your number will be deleted from their calling list. so he does this. Sometimes when he has to much time on his hands he askes them to hold and then when he comes back if they are still there he starts talking about a different subject and then asking about their family and any thing he can think of. Some times he puts them on hold or just lays the phone down for quite a while. You would be surprised how many keep holding.