U.S. Virgin Islands Phone Numbers: Format, Area Code & Validation Guide - phone-number-standards -

Frequently Asked Questions

Local calls within the USVI require only the seven-digit number (NXX-XXXX), without the area code. The NXX format ensures consistent numbering across all services, simplifying call routing and number management within applications. You do not need to dial '1' before the number.
The area code for the entire U.S. Virgin Islands is 340. This area code is used as part of the North American Numbering Plan (NANP). It's important for developers to include this area code when formatting numbers in the international E.164 standard (+1340NXXXXXX).
To dial a toll-free number from the USVI, dial "1" followed by the toll-free number (1-800-XXX-XXXX). This is consistent with the NANP dialing procedures for toll-free and premium-rate numbers. The '1' prefix is essential for accurate routing.
The USVI uses the North American Numbering Plan (NANP) for seamless integration with North America and the Caribbean. This simplifies development by enabling the use of existing NANP-compatible tools and libraries. It ensures consistent and reliable communications.
Always store USVI phone numbers internally in E.164 format (+1340NXXXXXX) for consistency and interoperability. Convert to local display formats (e.g., (340) NXX-XXXX) only when presenting numbers to users. This simplifies data exchange between different systems and ensures compliance with international standards.
The emergency number for the U.S. Virgin Islands is 911, connecting directly to the Enhanced 911 (E911) system. This provides location information to emergency responders, ensuring a rapid response. E911 adheres to FCC emergency guidelines, following national standards.
Yes, the USVI has a number portability system aligned with FCC regulations for Wireless Local Number Portability (WLNP). This allows users to keep their numbers when switching providers, with minimal service interruption during the porting process, typically under 30 minutes.
You can check the porting status of a USVI number using a porting API. Ensure you normalize the number to E.164 format (+1340NXXXXXX) before making the API call. Implement robust error handling to manage potential issues, and consider retry mechanisms.
5G deployment is underway in the USVI's major urban centers, primarily tourist areas and business districts. Expansion to residential areas is planned for 2024. Developers should adapt applications to leverage 5G's increased speed and capacity as it becomes more available.
Use regular expressions like `^\+1340[2-9]\d{2}\d{4}$` to validate USVI numbers in E.164 format. Robust validation prevents errors and ensures data integrity in your applications. This format ensures that all numbers adhere to international standards
Number porting in the USVI typically takes 1-3 business days for standard ports. Wireless-to-wireless porting may offer same-day transfers for eligible cases. Importantly, providers cannot refuse porting requests due to outstanding balances.
Use coverage APIs that allow queries by location and technology (e.g., 4G, 5G). This data helps optimize application performance and provides accurate service availability information to users. Caching frequently accessed locations can improve performance.
Store numbers in E.164 format, implement robust validation, integrate portability and coverage checks, and employ comprehensive error handling. Adhere to ITU-T E.164 and NANP standards, and stay updated on FCC regulations and carrier changes.
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