It is to prevent from calling when the other party is in a situation that is difficult to receive the call by informing the status. As a double-sided display, the status of other party can be known through one side and the other side can be used for calling and other functions. Also, one status can be created. It is for those who want to create and express their status and do not want to be invaded of their privacy or personal life.
Copyright by Sang-Hoon Lee & Peclers korea