Any call coming from a 555 area code prefix (e.g., 212-555-0199) is guaranteed to be fake or a scam, as these are reserved for fictional use [39]. If you'd like, let me know: Are you building an app or looking for personal settings ? Which country or region are you focused on?

* Reveal Caller ID ( 82): If your number is usually hidden, dialing before an area code and number will temporarily show your ID to the recipient [11].

You can set up "triggers" in your database (using tools like Ninox ) to automatically fill in a "State" or "City" field based on the area code of a phone number [15].