This paper uses the theoretical perspectives of disruptive innovation, network externalities, and regulation to study the submarket strategies of incumbent firms that operate in a regulated network industry. In this setting, the impact of potentially disruptive innovations might be different because of the tighter regulation of incumbent firms. By analyzing the entry and success patterns of incumbent mobile network operators (MNOs) in the public hotspot markets in 17 Western European countries, we focus on how regulation and network effects as well as disruption factors influence the incumbent firms' strategies. In doing so, this paper departs from prior research that has primarily focused on unregulated industries and combines contradicting explanations from disruptive innovation theory, the motivation/ability framework, regulation theory, as well as network effects to provide a comprehensive analysis on how incumbents behave in a regulated network industry that is being confronted with a potentially disruptive innovation. In particular, while disruptive innovation theory predicts that the incumbents' vast experience in an industry could cause them to avoid entering new submarkets created by potentially disruptive innovations, the desire to avoid regulation could encourage such submarket entry. Furthermore, in regulated network industries, incumbent firms might have a stronger motivation to enter new submarkets as the importance of single customers and high market shares could be substantially different. These contrasting insights are used to develop an integrative research model and to derive hypotheses on incumbents' submarket entry decision and success. Drawing on cross‐sectional, multicountry data of 62 MNOs that operate in 17 Western European countries, this study uses logit and tobit regressions to test the impact of disruption factors, regulation, and network externalities on the entry decision and success of incumbent firms. The results reveal that the incumbent MNOs are caught in an area of conflict between the regulated industry context and their international technology strategy. The findings suggest that the incumbent MNOs' motivation and ability to escape regulation positively influenced their submarket entry and success in the public hotspot market. Thus, the potentially disruptive scenario was successfully turned into a potentially sustaining one as the incumbent MNOs could enhance their presence in the mobile broadband market. The testing on a multicountry basis as well as the positive influence of ethnocentric technology strategies for public hotspots, which are devised in the headquarters' location and are then brought out internationally, shed new light on an industry that has typically been characterized by country‐by‐country decisions. These findings may also reveal challenges for future research on disruptive innovations in multinational industries and expose future challenges for regulative authorities and managers. This paper thereby adds to the theory of disruptive innovation as it includes the influence of regulation on incumbents in network industries. Additionally, this study expands on previous findings on the disruptive potential of wireless local area network technology by employing a multi‐country analysis in 17 Western European countries.