Tennessee Private Investigator Licensing Practice Exam

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What does an Electronic Serial Number (ESN) do?

  1. Identifies the carrier of the phone

  2. Monitors phone usage

  3. Serves as a unique identifier for individual cell phones

  4. Enables international dialing

The correct answer is: Serves as a unique identifier for individual cell phones

The Electronic Serial Number (ESN) serves as a unique identifier for individual cell phones, which is its primary function. Each ESN is distinct to the device, allowing mobile carriers and network systems to recognize and differentiate one phone from another. This uniqueness is crucial for managing and tracking devices on wireless networks, ensuring that each phone can be properly authenticated and accounted for when it connects to the network. While other options mention functions like identifying the carrier or enabling international dialing, those are not the primary purpose of the ESN. The ESN specifically relates to the phone itself, making it instrumental in device management and identification within telecommunications systems.

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