This reminds me of a website I cited in a presentation I did years ago. You entered the phone number of a recipient, your phone number and selected a date. They system called a few minutes later and prompted you to record a message. On the date you specified it called the number and played the message you recorded. It was meant for birthdays and such but think of the implications. You could use it to send birthday or whatever messages to all your loved ones for years after you have passed away. Spooky?
This site had a one year horizon but I bet there are some perpetual ones now.