In
Australian youth slang, to
prank someone means to
dial their
mobile phone, then hang up before they pick up.
It does not necessarily mean doing so in a malevolent way; rather it is a way to avoid exorbitant mobile charges when a person picks up; since phone companies do not charge if the receiver does not answer.
It is used as a verb, e.g., "I'll prank you when I get to your place and you can come down."