As a hook, teachers may show students a video on the various kinds of communication devices that changed over the years. An example of the Youtube video is as follows: https://www.youtube.com/watch?v=tHLPnOoeOeM

A sequencing activity can be done to explore how communication devices have evolved over time. Teachers can also look for the various different kinds of telephones and bring them to class, so that students cna have a play with them, or even do some role-playing.