How to identify overseas fraudulent phone calls?

I believe many friends have been harassed by fraudulent phone calls and text messages. Judging from the early warning of fraud, many victims suffered property losses because they received fraudulent calls from overseas. The most common ones begin with "+"or "00", such as "0085", "0087" and "0026". These numbers have obvious characteristics, and all of them have international crown codes starting with "00" (some mobile phones will translate "00" into "+"in the number display. If you don't have a fixed overseas relationship or have bought things on overseas shopping platforms and often receive overseas calls, then these overseas calls are almost all fraudulent calls. Please be vigilant and answer carefully! After buying a large amount of personal information through illegal channels, scammers use online virtual numbers and forged numbers to make fraudulent calls to overseas and domestic users, and implement types of fraud such as "impersonating customer service, impersonating public security law, and handling loans". Are we really helpless in the face of annoying fraudulent phone calls and text messages?