Radio Disney used to do this (maybe they still do??). A year or two ago there was a link on their website that took me to some sort of phone service website. From there, I could arrange for phone calls for birthdays, anniversaries, holidays, and so on (if memory serves me correctly, not all of the phone calls were Disney-themed). Since it was the Christmas Season at the time, I arranged for Santa Claus to call my daughter. The look on her face when she answered the phone was priceless.