answer:If they were calling from upstairs in your own house then you should start to panic now. But I was about to make one of these calls once, too. I knew my friend was supposed to be expecting my call, and we were about 1000 miles apart. And he wasn’t answering repeated calls. So I looked up one of his neighbors using an Internet search engine and prepared to call them instead, to see if they knew if my friend was home or not home, injured, whatever. Before I made the call to the neighbor, he called me himself and we made our plans. But with reverse directories being what they are, and people’s inventiveness, I wouldn’t be too surprised at receiving such a call. But I also wouldn’t give out a lot of information to a stranger, either.