20s
"If you utter so much as one syllable, I'LL HUNT YOU DOWN AND GUT YOU LIKE A FISH! If you'd like to fax me, press the [.........]"
When the Grinch wakes up to check his voicemail and it's empty, he stops to check his outbound messagewhich is what the quote references.
A
Star Key
B
End Button
C
0 button
D
Pound Key