According to regulations, what information is NOT required from an operator involved in an accident?

In the context of accident reporting regulations, certain pieces of information are mandated to ensure thorough documentation of the incident. The operator's address, license plate number, and vehicle identification number are all crucial for identifying the involved parties and the vehicles. These details help law enforcement, insurance companies, and other relevant authorities in processing claims and investigating the accident effectively.

The operator’s phone number, however, is not typically required under standard accident reporting protocols. While having a phone number may facilitate communication, it is not as essential as the other pieces of information listed. Thus, the requirement for the operator's phone number is often omitted from formal regulations regarding accident information collection, making it the correct answer in this scenario.