Voicemail.
"Salutations! You have reached the cellular phone of Princess Rosella of Daventry! I am most apologetic for having missed your call, but hopefully I shall figure out how to access the voice messaging system soon so that I may return it as soon as humanly possible. This technology is so strange! But I do hope you are calling about something interesting, and, if it's fun, that I certain receive the message. Thank you very much!"
CLICK!
CLICK!