Micronesia Phone Numbers: Format, Area Code & Validation Guide

This guide provides a comprehensive overview of the telephone numbering system in the Federated States of Micronesia (FSM) for developers and system administrators. Understanding the nuances of this system is crucial for building robust and compliant applications.

Background

The Federated States of Micronesia (FSM), a nation of 607 islands spread across the western Pacific Ocean, has a unique telecommunications landscape. The FSM Telecommunications Corporation (FSMTC) holds a central role, acting as both the primary service provider and the regulatory body. This centralized structure results in a simplified numbering plan, which, while advantageous in some aspects, requires careful attention during technical implementation. Currently, FSMTC is working on expanding fiber optic cable connectivity throughout the islands, with plans to connect Kosrae by 2021 and ongoing efforts to bring fiber to every home, business, and school on the main islands of all four states. This initiative, funded by the World Bank, aims to significantly boost internet speeds and economic development within the FSM.

Numbering Plan Structure

Micronesia uses a closed numbering plan, meaning all numbers are fixed length and follow a predictable format. There are no area codes within the FSM.

Number Formats

• Country Code: +691
• Fixed-Line: XXX XXXX (7 digits total)
• Mobile: 7XX XXXX (8 digits total)
• Special Services: Reserved for future use. Contact FSMTC for details.

Example Numbers:

• Fixed-Line: +691 320 1234
• Mobile: +691 743 1234

Number Validation

Validating Micronesian phone numbers is essential for data integrity and application functionality. Use the following regular expressions for validation:

// Fixed-line validation
const fixedLineRegex = /^[2-6]\d{6}$/;

// Mobile number validation
const mobileRegex = /^7\d{7}$/;

// Comprehensive validation function (including country code handling)
function validateMicronesianNumber(number) {
  const cleanedNumber = number.replace(/\D/g, ''); // Remove non-digit characters
  if (cleanedNumber.startsWith('691')) {
      return fixedLineRegex.test(cleanedNumber.slice(3)) || mobileRegex.test(cleanedNumber.slice(3));
  } else {
      return fixedLineRegex.test(cleanedNumber) || mobileRegex.test(cleanedNumber);
  }
}

Dialing Procedures

Domestic Calls

Dialing within Micronesia is straightforward. Simply dial the 7- or 8-digit subscriber number directly.

International Calls

• Outbound from Micronesia: Dial 00 (International Prefix) + Country Code + Number

  • Example (to USA): 00 1 555 123 4567

• Inbound to Micronesia: Dial +691 + Local Number

  • Example (Fixed-Line): +691 320 1234
  • Example (Mobile): +691 743 1234

Best Practices for Developers

1. Robust Validation and Formatting

The following class provides a comprehensive solution for validating and formatting Micronesian phone numbers:

class MicronesianNumberValidator {
  // ... (same code as original article)
}

This class not only validates but also formats numbers to the international E.164 standard (+691 XXX XXXX), ensuring interoperability.

2. Comprehensive Error Handling

Implement robust error handling to manage invalid input and prevent unexpected application behavior. Consider using custom error classes for more specific error reporting:

// ... (same error handling code as original article)

3. Data Storage and Privacy

• E.164 Format: Store phone numbers in the international E.164 format (+691 XXX XXXX) for consistency and compatibility with international systems.
• Data Privacy: Adhere to local regulations and best practices for data privacy when storing and handling personal information like phone numbers. Refer to the FSMTC's official website and relevant legal resources for specific guidelines.

4. Number Portability

Number portability is not currently supported in Micronesia. Numbers are permanently assigned to FSMTC. However, it's prudent to design your system with future portability in mind, should regulations change.

5. SMS Messaging

Ensure that SMS-enabled numbers start with 7. Implement separate validation patterns for SMS if necessary.

6. Emergency Services

Integrate support for the emergency number (911) in your applications.

Regulatory Compliance

Compliance with FSMTC regulations is paramount. Key considerations include:

• Data Privacy: Comply with FSMTC regulations regarding the secure storage and handling of subscriber data.
• Format Consistency: Use the E.164 format for international compatibility.
• Documentation: Maintain detailed records of number usage and allocation.
• Regular Audits: Conduct periodic audits of your number management system to ensure ongoing compliance.

Future Considerations

• Number Portability: While not currently available, anticipate potential future implementation and design your systems accordingly.
• Evolving Numbering Plan: Stay informed about any updates or changes to the Micronesian numbering plan by referring to the FSMTC and TRA websites.

Resources and Support

• FSMTC Official Website: https://www.fsmtc.fm
• TRA (Telecommunications Regulation Authority) Website: https://tra.fm/
• ITU-T E.164 Standards Documentation: https://www.itu.int
• FSMTC Developer Support: Contact FSMTC directly for technical support related to their services.

By following these guidelines, you can ensure your applications handle Micronesian phone numbers correctly, efficiently, and in compliance with all applicable regulations.