Phone Numbers in Northern Mariana Islands

Quick Reference

• Country: Northern Mariana Islands
• Country Code: +1
• International Prefix: 011
• National Prefix: 1
• Area Code: 670
• Typical Number Length: 10 digits (e.g., 670-123-4567)

Overview

Discover the comprehensive telephone numbering plan of the Northern Mariana Islands (MP), part of the North American Numbering Plan (NANP). This guide is essential for telecom professionals, developers, and systems administrators to understand and implement MP's phone number formats, dialing procedures, and telecommunications standards.

Number Formats

General Number Structure

The Northern Mariana Islands use the following standard structure for phone numbers:

• Country Code: +1
• Area Code: 670
• Subscriber Number: 7 digits

Detailed Number Formats

Type	Format	Example	Description
Geographic	+1 670 NXX XXXX	+1 670 234 5678	Standard format for landline numbers.
Mobile	+1 670 NXX XXXX	+1 670 234 5678	Mobile numbers follow the same format as landlines.
Toll-Free	+1 800 XXX XXXX	+1 800 234 5678	Toll-free numbers, typically starting with 800, 888, 877, etc.
Premium Rate	+1 900 XXX XXXX	+1 900 234 5678	Premium rate numbers, often used for services with additional charges.

Regular Expressions for Validation

Below are the regular expressions that can be used to validate different types of phone numbers in MP:

• Geographic/Mobile:
  ^\+1\s670\s[2-9]\d{2}\s\d{4}$
  

• Toll-Free:
  ^\+1\s(800|888|877|866|855|844|833)\s\d{3}\s\d{4}$
  

• Premium Rate:
  ^\+1\s900\s[2-9]\d{2}\s\d{4}$
  

Dialing Procedures

Domestic Calls

• Landline to Landline: Dial the 7-digit local number directly (e.g., 234-5678).
• Landline to Mobile: Dial the 7-digit local number directly (e.g., 234-5678).
• Mobile to Mobile: Dial the 7-digit local number directly (e.g., 234-5678).

International Calls

• Outgoing International Calls: Dial 011 (International Prefix) + Country Code + Area Code + Subscriber Number.
  • Example: To call a number in Japan from MP, dial 011 81 XXXXXXXXXX.
• Incoming International Calls: Dial +1 670 followed by the 7-digit local number.
  • Example: An international caller would dial +1 670 234 5678.

Number Portability

Number portability is supported in the Northern Mariana Islands, allowing users to retain their phone numbers when switching between service providers. This applies to both mobile and fixed-line numbers. Specific details are managed by local telecom operators.

Major Telecom Operators and Number Ranges

The following are the primary telecom operators in the Northern Mariana Islands, along with their associated number ranges:

Operator	Service Type	Number Ranges
IT&E	Mobile, Landline	670-2XX-XXXX, 670-3XX-XXXX
Docomo Pacific	Mobile, Landline	670-4XX-XXXX, 670-5XX-XXXX
GTA	Mobile, Landline	670-6XX-XXXX, 670-7XX-XXXX

ITU-T Recommendations

The Northern Mariana Islands' numbering plan conforms to the ITU-T Recommendation E.164, which outlines the international public telecommunication numbering plan. This ensures compatibility and interoperability with global telecommunications systems.

Number Allocation and Management

The North American Numbering Plan Administrator (NANPA) is responsible for the allocation and management of phone numbers in the Northern Mariana Islands. NANPA oversees the assignment of area codes, central office codes, and ensures that numbering resources are used efficiently.

Technical Restrictions and Special Cases

• Golden Numbers: Certain easily memorable numbers are reserved or sold at a premium by telecom operators.
• Number Blocking: Users can request the blocking of specific numbers to prevent unwanted calls.

Technical Considerations

For developers and systems administrators working with MP phone numbers, consider the following:

• Validation: Ensure that systems validate phone numbers against the correct format using regular expressions.
• Portability: Implement processes to handle number portability, including updating databases and routing tables.
• Time Zone Handling: The Northern Mariana Islands operate in the Chamorro Standard Time (UTC+10). Ensure that systems account for time zone differences when scheduling calls or sending time-sensitive messages.
• Regulatory Compliance: Stay up-to-date with regulations from the Federal Communications Commission (FCC) and NANPA to ensure compliance in telecommunications operations.