This reminds me of a time when I was younger, somewhere around 8 to 10 years old and my parents had called me into the room to tell me that I had a phone call. I was surprised because I never got phone calls. When I took the call, it was Santa on the other end of the phone. It was just a recording but at that age, it really was magical for me.
This really is a nice way to personalize a child's Christmas and I am sure that they will remember it years from now.
Merry Christmas and Enjoy!