Micronesia Phone Numbers: Format, Area Code & Validation Guide

Learn how to validate and format Federated States of Micronesia (FSM) phone numbers using country code +691. This comprehensive guide covers FSM telephone numbering formats, validation regex patterns, and compliance requirements for developers building telecommunications applications.

Understanding FSM Telecommunications Infrastructure

The Federated States of Micronesia spans 607 islands across the western Pacific Ocean. The FSM Telecommunications Corporation (FSMTC) serves as both the primary service provider and the regulatory body overseeing the +691 country code. This centralized structure creates a simplified numbering plan that requires careful attention during technical implementation.

FSMTC is expanding fiber optic cable connectivity throughout the islands. The World Bank–funded initiative aims to connect Kosrae by 2021 and bring fiber to every home, business, and school on the main islands of all four states, boosting internet speeds and economic development.

FSM Phone Number Structure and Format

Micronesia uses a closed numbering plan with the international country code +691. All FSM telephone numbers have fixed length and follow a predictable format. Unlike larger countries, the FSM has no area codes within the country.

FSM Telephone Number Formats

• Country Code: +691 (ITU-assigned Micronesia country code)
• Fixed-Line Format: XXX XXXX (7 digits total)
• Mobile Number Format: 7XX XXXX (8 digits total, always starts with 7)
• Special Services: Reserved for future use. Contact FSMTC for details.

Example Numbers:

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

Phone Number Validation for FSM +691

Validate Micronesian phone numbers to ensure data integrity and prevent formatting errors in your application. Use these regular expression (regex) patterns for FSM number 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);
  }
}

How to Dial Micronesia Phone Numbers

Domestic Calls Within FSM

Dial the 7- or 8-digit subscriber number directly when calling within Micronesia.

International Calls to/from Micronesia

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

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

• Calling to Micronesia: Dial +691 (FSM country code) + Local Number

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

Developer Best Practices for FSM Phone Numbers

1. Robust Validation and Formatting

Implement proper phone number validation to ensure users enter valid +691 Micronesia numbers. This prevents data quality issues and improves user experience by catching errors early.

Use this class to validate and format Micronesian phone numbers:

class MicronesianNumberValidator {
  constructor() {
    this.countryCode = '691';
    this.fixedLineRegex = /^[2-6]\d{6}$/;
    this.mobileRegex = /^7\d{7}$/;
  }

  cleanNumber(number) {
    return number.replace(/\D/g, '');
  }

  isFixedLine(localNumber) {
    return this.fixedLineRegex.test(localNumber);
  }

  isMobile(localNumber) {
    return this.mobileRegex.test(localNumber);
  }

  validate(number) {
    const cleaned = this.cleanNumber(number);
    const localNumber = cleaned.startsWith(this.countryCode)
      ? cleaned.slice(3)
      : cleaned;

    return this.isFixedLine(localNumber) || this.isMobile(localNumber);
  }

  format(number) {
    if (!this.validate(number)) {
      throw new Error('Invalid Micronesian phone number');
    }

    const cleaned = this.cleanNumber(number);
    const localNumber = cleaned.startsWith(this.countryCode)
      ? cleaned.slice(3)
      : cleaned;

    const formatted = localNumber.length === 7
      ? `${localNumber.slice(0, 3)} ${localNumber.slice(3)}`
      : `${localNumber.slice(0, 3)} ${localNumber.slice(3)}`;

    return `+${this.countryCode} ${formatted}`;
  }
}

This class validates and formats numbers to the international E.164 standard (+691 XXX XXXX) for interoperability.

2. Comprehensive Error Handling

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

class PhoneNumberError extends Error {
  constructor(message) {
    super(message);
    this.name = 'PhoneNumberError';
  }
}

class InvalidFormatError extends PhoneNumberError {
  constructor(number) {
    super(`Invalid phone number format: ${number}`);
    this.name = 'InvalidFormatError';
  }
}

class InvalidLengthError extends PhoneNumberError {
  constructor(number, expectedLength) {
    super(`Invalid length for ${number}. Expected ${expectedLength} digits.`);
    this.name = 'InvalidLengthError';
  }
}

// Usage example
try {
  const validator = new MicronesianNumberValidator();
  const formattedNumber = validator.format(userInput);
  console.log(formattedNumber);
} catch (error) {
  if (error instanceof InvalidFormatError) {
    console.error('Please enter a valid FSM phone number');
  } else if (error instanceof InvalidLengthError) {
    console.error('Phone number has incorrect length');
  } else {
    console.error('An unexpected error occurred');
  }
}

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 telecommunications systems and SMS messaging platforms.
• Data Privacy: Follow local regulations and best practices when storing and handling phone numbers. Check the FSMTC official website and relevant legal resources for specific guidelines.

4. Number Portability

Micronesia does not currently support number portability. FSMTC permanently assigns all numbers. Design your system to accommodate future portability if regulations change.

5. SMS Messaging for FSM Mobile Numbers

All FSM mobile numbers (starting with 7) support SMS messaging. When implementing SMS functionality, validate that recipient numbers follow the mobile format (7XX XXXX) to ensure successful message delivery.

6. Emergency Services

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

FSM Telecommunications Regulatory Compliance

Comply with FSMTC regulations when handling Micronesian phone numbers. Key compliance requirements 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: Audit your number management system periodically 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.

Follow these guidelines to ensure your applications handle Micronesian phone numbers correctly, efficiently, and in compliance with all applicable regulations.