During the early 1990s the use of call signs became less common, to the point that most broadcasters do not use them at all. Some are retained in some form for branding - for example, 4XO Dunedin (until it was rebranded More FM Dunedin in 2004), Newstalk ZB (using the old 1ZB, 2ZB, 3ZB, 4ZB and various other Radio NZ commercial frequencies) and ZM (originally ZMFM, replacing the old 1ZM, 2ZM and 3ZM, now nationwide). Stations licensed since 1990 have not had call signs allocated.
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