Dominica Phone Numbers: Format, Area Code & Validation Guide

Quick Reference Guide

• Country: Dominica
• Country Code: +1 767
• International Prefix: 011
• National Prefix: 1

Overview

This comprehensive guide offers a detailed look into Dominica's telephone numbering plan. It covers the structure of phone numbers, dialing procedures, and regulatory information. Perfect for telecom professionals and developers seeking precise, data-driven insights into Dominica's phone systems.

Number Formats

General Number Structure

Dominica adheres to the North American Numbering Plan (NANP), similar to the United States and Canada. The typical phone number format includes:

• Country Code: +1
• NPA (Numbering Plan Area) Code: 767 (Dominica's unique area code)
• NXX (Central Office Code): 3 digits
• Subscriber Number: 4 digits

Example: +1 767 NXX XXXX

Detailed Number Formats

Type	Format	Example	Regex
Fixed-Line	767-2XX-XXXX	767-255-1234	^7672[0-9]{6}$
Mobile	767-[2-9]XX-XXXX	767-275-1234	^767[2-9][0-9]{6}$
Toll-Free	800-NXX-XXXX	800-234-5678	^800[2-9][0-9]{6}$
Premium Rate	900-NXX-XXXX	900-234-5678	^900[2-9][0-9]{6}$

Regular Expressions for Validation

For developers and system administrators, the following regex patterns can be used to validate Dominica phone numbers:

• Fixed-Line Numbers: ^7672[0-9]{6}$
• Mobile Numbers: ^767[2-9][0-9]{6}$
• Toll-Free Numbers: ^800[2-9][0-9]{6}$
• Premium Rate Numbers: ^900[2-9][0-9]{6}$

Dialing Procedures

Domestic Calls

• Landline to Landline: Dial the 7-digit number directly.
• Landline to Mobile: Dial the 7-digit number directly.
• Mobile to Mobile: Dial the 7-digit number directly.

International Calls

• Outgoing: Dial 011 (International Prefix) + 1 (Country Code) + 767 (NPA Code) + NXX XXXX (Subscriber Number).
  • Example: 011 + 1 + 767 + 255 1234
• Incoming: The caller should dial their international access code, followed by +1 767 and the local number.

Number Portability

Mobile number portability (MNP) is available in Dominica, allowing subscribers to retain their phone numbers when switching between service providers. This applies to both mobile and fixed-line numbers.

Telecom Operators and Number Ranges

Major Operators

Operator	Number Range
Flow (Liberty Global)	767-2XX-XXXX, 767-3XX-XXXX
Digicel Dominica	767-4XX-XXXX, 767-5XX-XXXX

Regulatory Information

Regulatory Body

The Dominica Telecommunications Authority (DTA) oversees the regulation and management of the telephone numbering plan in Dominica. For the latest updates, visit the official DTA website (replace with the actual URL if available).

Number Allocation and Management

Numbers are allocated and managed by the DTA in accordance with NANP guidelines. The DTA ensures efficient and fair distribution of numbers among operators, considering future growth and technological advancements.

Technical Considerations

For Developers and System Administrators

• Validation: Use the provided regex patterns to validate phone numbers programmatically.
• Number Formatting: Ensure that numbers are stored and displayed in the international format (+1 767 NXX XXXX) for consistency and ease of use.
• Portability Handling: Implement support for mobile number portability to accommodate users switching providers without changing their numbers.
• Time Zone Awareness: Dominica operates in the Atlantic Standard Time (AST) zone (UTC-4). Consider this when scheduling automated calls or services.

Conclusion

This guide offers a comprehensive overview of Dominica's telephone numbering plan, including formats, dialing procedures, and regulatory information. By adhering to the technical details provided, telecom professionals and developers can ensure accurate and efficient handling of phone numbers in Dominica.