Northern Mariana Islands Phone Numbers: Format, Area Code & Validation Guide - phone-number-standards -

Frequently Asked Questions

The area code for the Northern Mariana Islands (CNMI) is 670. This is a crucial detail for validating and processing phone numbers originating from this region, which is part of the North American Numbering Plan (NANP).
CNMI phone numbers can be formatted in several ways: International (+1-670-123-4567), National (1-670-123-4567), Local (670-123-4567), and with variations in punctuation. Your application should handle these different formats seamlessly.
A robust validation approach involves removing non-numeric characters, then using a regular expression like '^1?670[2-9]\d{6}$' to verify the format, ensuring the exchange code starts with 2-9 and excludes reserved N11 combinations.
The CNMI shares the +1 country code with the US, Canada, and some Caribbean nations as part of the North American Numbering Plan (NANP), simplifying dialing within the region. This system was established in the 1940s.
The emergency number for the CNMI is 911, utilizing the Enhanced 911 (E911) system which provides location information to emergency responders. This is in compliance with FCC mandates for dispatchable location data.
Consider number portability when a subscriber switches carriers but wants to keep their existing number. This involves coordination between carriers and the Number Portability Administration Center (NPAC) and may introduce delays.
Prioritize routing to the appropriate Public Safety Answering Point (PSAP) and collect location data using GPS or network-based methods. Comply with Kari's Law, which mandates direct 911 dialing and requires notification to a central location within the facility.
Yes, caching frequently accessed number ranges and validation results is a recommended optimization strategy to improve application performance when dealing with large volumes of phone numbers.
Exchange codes must start with digits 2-9, excluding N11 combinations reserved for special services. They must also adhere to NANPA guidelines for number conservation, including avoiding wasteful allocation.
Carrier integration involves routing calls based on number ranges and carrier-specific configurations. It's essential to implement fallback mechanisms and monitoring for network failures to ensure service availability.
Implement robust error handling by catching and logging errors during number processing, such as invalid formats or carrier integration issues. Consider specific strategies based on your application's requirements.
Starting in 2025, new CIC filing guidelines require an annual report to the NANPA. Telecom operators should ensure compliance with these guidelines to avoid potential CIC reclamation.
Consult the NANPA Guidelines (https://www.nationalnanpa.com/) and FCC Regulations (https://www.fcc.gov/) for detailed information on numbering plan administration, regulatory requirements, and best practices.
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