All over the world there are a multitude of more or less interesting cases for iPhone terminals, and even if many of them seem strange at first glance, the reality is that some have a rather large utility, which many do not intuit.
Most of these cases started as simple ideas, but reached the market thanks to successful funding sessions from users, so we are talking about products that not only proved to be profitable, but also generated satisfactory sales the large number of users who supported them.