You are right. I did the same test. We love to talk to grandkids using videocalls. We can inexpensively call friends around the world by using Skype to regular phones. Then comes people who have to ruin a good thing. They have a Skype account and can make all these scandalous calls. On the phone log this same number comes up! How can Skype find a way to block all but a few to you known Skype users?