Question: Under what regulatory framework is access to restricted local operator services by unauthenticated User Equipment (UEs) primarily governed in the United States, as related to manual roaming?
Option 1: European Telecommunications Standards Institute (ETSI) Guidelines
Option 2: Federal Communications Commission (FCC) regulations
Option 3: International Telecommunication Union (ITU) Recommendations for Mobile Networks
Option 4: American National Standards Institute (ANSI) Standards for Telecommunications
Explanation: This is correct because, in the context of U.S. regulations, access to restricted local operator services by unauthenticated UEs is based on FCC regulations related to manual roaming, indicating the regulatory framework in question is indeed the FCC's.