Final answer:
To look up customer accounts in Insight, you can use the Account Number, Phone Number, MAC Address, or Ticket Number, with each serving as a unique identifier in the customer support and account management process.
Step-by-step explanation:
The different numbers you can use to look up customer accounts in Insight are Account Number, Phone Number, MAC Address, and Ticket Number.
Each of these identifiers serves a unique purpose in the system. An Account Number is a unique numerical identifier assigned to the customer's account, often used as the primary method of identification. A Phone Number is associated with the customer's personal or business line and can be used for identification and verification. A MAC Address is a hardware identification number that uniquely identifies each device on a network, thus providing information associated with the customer's equipment. Lastly, a Ticket Number relates to specific customer service inquiries or issues and can be used to track the progress of problem resolution.