Unless you are watching a drama set in a time before phones were invented, cell phones will play an important part in the plot of whatever k-drama you watch. The cell phone or hendeupon, to use its Konglish name, is used so frequently in drama plots that it almost becomes a character in its own right.

Characters never leave the house without their phones and almost everyone, no matter how poor they are, can afford the latest model. And while the whole world increasingly uses cell phones to stay in touch, k-drama characters use them to hatch evil plots, blackmail people, complicate their romances, and in general move the plot forward.

In "School 2013" Lee Jong Suk used a cell phone to warn the bullies who tormented him that he has recorded their threats.
To read the article, visit kdramastars.com.