When was the telegraph discontinued or when did the telegraph decline in popularity?

The telegraph lost popularity when the telephone became cheap enough and reliable enough to use. The last land-line telegraph message was sent by the Milwaukee Railroad, between Milwaukee and Minneapolis in 1985. The last radio telegraph that was commercial was sent by coastal marine stations on 7/13/1999. The telegraph is still being used by Amateur radio license holders to this day. Anyone can become a Amateur Radio Operator just by passing a test.