Multiple realities
(covers information from several alternate timelines)
A ringtone or ring was a song or sound that telephones and other communication devices made when someone was trying to contact a particular device or phone number.
Communicators chirped when they were receiving a call. (Star Trek: The Original Series)
In the alternate reality 2240s, a Corvette owned by James T. Kirk's stepfather had a Nokia mobile phone with its ringtone set to Grande Valse. (Star Trek)
Several Star Trek music tracks and sounds are available as ringtones. (citation needed • edit)