過か去このものになる

expression, godan verb (-ru)

become a thing of the past

Used when something is no longer relevant, current, or in use; often implies obsolescence or being outdated.

• スマートフォンの普ふ及きゅうで、公こう衆しゅう電でん話わは過か去このものになった。

  With the spread of smartphones, public telephones have become a thing of the past.