I am glad to find that there is some good information on the web pertaining to this subject.  When I was a baby my mother received one of these phone calls from her mother.  Preceding the phone call her oven timer kept going off by itself just as she was drifting to sleep.  This happened three times and then as she was drifting off again there went the phone.  My mother told me that her mom called her by the nickname no one else knew and her voice sounded very far away and weak.  My mother hung up the phone and called my father at work.  He was military police at the time and didn't want to come home, but mom was so hysterical he left work.  The interesting thing about this is that it happened years after her mom died.  My grandmother died when my mother was 9.  My mom wanted to discuss this incident this weekend on the phone so I have printed off some of your info to read to her.  Yes, this phenomenon is unexplainable, but that doesn't mean it isn't happening.  It would be ignorant not to believe something just because you can't explain it yet. I believe years and years from now scientists will discover that this is very real and it will be common knowledge.  Not something everyone tries to explain away when you know darn well it happened!