The digital transformation process has transformed the Internet of Things from merely a technological innovation into a strategic investment topic for financial markets. The proliferation of the IoT ecosystem is creating a structure that could directly affect the telecommunications sector, particularly through connectivity infrastructure, data services, and next-generation communication networks. Within this framework, this study aims to determine the spillovers of IoT-themed volatility shocks to the telecommunications sectors. For this purpose, volatility spillovers between the Indxx Global Internet of Things Thematic Index and the returns of the global and 46-country telecommunications sector indices were analyzed by Li and Enders (2018) variance causality test extended with the Fourier functions, for the period May 9, 2016-September 15, 2025. The study revealed volatility spillovers from the IoT index to telecommunications sector index returns in 34 out of 46 countries. In contrast, no significant spillover was detected to the telecommunications sector of the 12 countries and the World Telecommunications Index. Furthermore, it was determined that volatility spillovers were temporary in 15 countries and persistent in 19. The findings reveal that the effect of IoT-related financial shocks on the telecommunications sectors varies by country and that this relationship should be taken into account in terms of portfolio diversification, risk management and country-specific sector assessments.