Final answer:
XFINITY Voice Unlimited allows for long-distance calls mainly within the United States and Canada, with potential for other international calls based on specific plan details. Deregulation and FCC oversight have shaped these services.
Step-by-step explanation:
With XFINITY Voice Unlimited, subscribers are able to make long-distance calls to multiple locations. Since the Federal Communications Commission (FCC) oversees all forms of telephony, including local, long-distance, and wireless services, the deregulation policies of the 1990s affect services like XFINITY Voice.
Through the process of deregulation, competition has been introduced into the market, allowing local service providers to offer a variety of services. XFINITY Voice Unlimited typically provides long-distance calling to places within the United States, Canada, and sometimes to other international locations. It's important for subscribers to check the specific details of their plan and service area as services may vary.