It has been a highly interesting task to collect all this information about wireless security aspects into a single book. I reckon many of the presented solutions tend to develop extremely fast as the threats become increasingly sophisticated and innovative. The challenge is, of course, to maintain the relevancy of the written material. It is perhaps equally difficult for the stakeholders to ensure proper shielding of the wireless communications networks, devices, mobile apps and services along with all the advances in consumer and machine‐to‐machine domains – not forgetting the overall development of the Internet of Things (IoT), which is currently experiencing major interest. Even so, I believe that the foundations are worth describing in a book format, while the latest advances of each presented field can be checked via the identified key references and root sources of information.

An important part of this book, that is, describing the basics, is something I have been involved with throughout my career when I was working with mobile network operators as well as network and device vendors, while the rest of the contents complete the picture by presenting the most recent advances such as embedded SIM and respective subscription management which will be highly relevant in the near future for the most dynamic ways of utilizing consumers’ mobile and companion devices as well as the ever growing amount of IoT equipment. I thank all my good colleagues I have had the privilege to work with and to exchange ideas related to mobile security. I want to especially mention the important role of Giesecke & Devrient in offering me the possibility to focus on the topic in my current position.

I warmly thank the Wiley team for the professional work and firm yet tender ways for ensuring the book project and schedules advanced according to the plans. Special thanks belong to Mark Hammond, Sandra Grayson, Tiina Wigley and Nithya Sechin, as well as Tessa Hanford, among all the others who helped me to make sure this book was finalized in good order.

I also want to express my warmest gratitude to the Finnish Association of Non‐fiction Writers for their most welcomed support.

Finally, I thank Elva, Stephanie, Carolyne, Miguel, Katriina and Pertti for all their support.