By virtue of using a mobile device, you will have used a messenger app of some description or the other (as well as any number of other apps). As time has moved on, so have the apps. For the humble messenger software, you can now add sound, video, and audio, and have it extend over many messages (a message was traditionally 160 characters, as it was only used by telecom operatives to send small messages informing others of their progress or a fault in the system). How did the apps metamorphose to the apps we have today? The answer is simple—planned changes.
In this chapter, we will cover the following topics: