Is it useful to call the police after being cheated by telecom for a few days, Zhihu

Useful. According to the relevant public information, we only need to prepare alarm materials, chat records with fraudsters, transfer records to fraudsters' bank accounts, bank flow, some websites and mobile apps provided by fraudsters, and other evidence that can prove fraud. "Police" refers to the state and its rulers, according to the will of the state and the ruling class and the established standards of the police organs and their policemen.