Avoid brain tumors

Lately, I have been nostalgic for a phone like these in my kitchen.  Mounted on the wall with a long dangly cord that gets twisted up.  The kind where you get to/have to be surprised by who is on the other end.  Remember when prank phone calls were hours of fun?  I don't even have a landline anymore, but Dr. Oz says I should; to avoid brain tumors in my children, they are not supposed to use a cell phone.  So they either don't call Grandma and Papa or I hit ebay and call Ma Bell.  My Grandparents used to have a black one, it was really heavy and loud, I wonder if they still do...