In the recent decades, mobile communications have gained a lot of importance, not only in the private sector, but also in the industry. As the drive of the so-called “Fourth industrial revolution”, it lays the foundation of the implementation of Industry 4.0. Mobile applications allow for data acquisition, digitization, and automation of industrial processes. Machine learning and artificial intelligence are also increasingly used in the industrial context. In this article, we will clarify the different mobile-based transmission technologies, what is the potential of 5G when it comes to applications in Industry 4.0, and delve into some application examples.