Newstalk ZB is a nationwide New Zealand talk radio network operated by The Radio Network of New Zealand (TRN). It is available in almost every radio market in the country, and has news reporters based in many of them. In addition to talkback, the network also broadcasts news, interviews, music, and sports (sometimes in partnership with its sister network Radio Sport).Newstalk ZB started in 1987 when Auckland's[1ZB changed to a talkback format and was originally known as Newstalk 1ZB. During the late eighties and early nineties Radio New Zealand switched many of their local heritage stations to FM but retained the AM frequency in each region running the same programme on both frequencies, however some stations ran separate programmes at certain times(such as talk shows) on the AM frequency. In 1993 and 1994 the local station in each region was rebranded with the Classic Hits name and the AM frequency was used to roll out Newstalk ZB across New Zealand. In Christchurch and Wellington local stations 2ZB and 3ZB changed to a talk format around 1991 and new local stations Goodtime Oldies B90 FM (Wellington) and Goodtime Oldies B98 FM were created. Around 1994 2ZB and 3ZB were rebranded as Newstalk ZB retaining local announcers at first but in recent years as local announcers have left shows have been replaced with network shows. Wellington and Christchurch still have a local show in the mornings between 9 am and 12 pm. In February 1993, in Auckland, Newstalk ZB began broadcasting on 89.4 FM as well as the original 1080 AM when local station 89X (formerly 89FM) ceased to operate, Radio New Zealand purchased this station a year earlier and chose to close it down and use the frequency for Newstalk ZB. The Newstalk ZB nationwide 0800 number (0800 80 10 80) actually comes from the original 1080AM frequency in Auckland that is still in use today.In 1996 Radio New Zealand sold their commercial operation and Newstalk ZB, along with Classic Hits and ZM, became part of The Radio Network.