Old flip phones and Mobile network state

With older phones, mainly, the state of the Mobile network was often represented by a single icon.

Today, most smartphone models still have a visual icon and have a hidden text setting in a panel menu.

In either case, the Mobile network state shows the user. Whether they can expect the functionality of the network operator’s network by indicating whether the devices connecting correctly or not. Ideally, this indicates in a way that is obvious to the end user.