[RMXP] PHONE-CALL COMMON EVENT

I am making a phone-call common event, which is similar to the Pokemon game's Pokegear phone device in my Rpg XP game Fallen Origins but I have no source script availiable to help me in the task. Some extra help or advice would be handy for this

Well, it's going to be a device (item) similar to a telephone basically and every time there is a call, the receiver of the call says something different. If anyone can help me with it, I'll be grateful