the constitutional complaint in this case against acts of acquiring communications data. Complainant K.M. filed the constitutional complaint in this case, adding, in addition to his claim against the abovementioned Article 83, Section (3), a claim against the proviso of Article 83, Section (4) of the Telecommunications Business Act, which prescribes that if there is an urgent reason, the head of the investigative agency et al. may request, without resorting to writing, telecommunications business operators to provide communications data. B. 2022Hun-Ma105 1. On December 23, 2021, Complainant asked Company B, a telecommunications business operator, to confirm whether or not his communications data had been provided to an investigative agency, and on December 27, 2021, Company B confirmed that Complainant’s communications data containing his name, resident registration number, address, phone number, subscription date, and termination date were given to the *** District Prosecutor’s Office three times between February 23, 2021 and June 28 of the same year. 2. In response, on January 25, 2022, Complainant filed the constitutional complaint in this case, asserting that Article 83, Section (3) of the Telecommunications Business Act, which prescribes that telecommunications business operators may furnish users’ personal information at the request of the investigative agency et al. violated the principle of warrant and infringed upon his fundamental rights. C. 2022Hun-Ma110 1. Complainant’s communications data, specifically his name, resident registration number, address, phone number, subscription date, and termination date, were supplied to the investigative agency et al., such as a district prosecutor’s office and a police station, four times between - 23 -