Telecommunication infrastructures provide essential services to urban communities. During an emergency caused by a seismic event, their functionality is essential to facilitate search and rescue operations. The aim of this study is to introduce a simplified method for assessing the vulnerability of a wireless telecommunication network under seismic action. The case study is a virtual city called Ideal City and part of a larger project on assessing the resilience of vital infrastructure in an urban environment. The wireless network composed of three operators is built starting from information on the real wireless network of the city of Turin. Some simplifications and assumptions are introduced due to the confidentiality of the data, as communications networks are strategic infrastructures.