Phone Numbers in Grenada: Formats and Dialing Rules

Quick Reference

• Country: Grenada
• Country Code: +1 (473)
• International Prefix: 011
• National Prefix: 1
• Regulatory Body: National Telecommunications Regulatory Commission (NTRC)

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Overview

Discover the comprehensive details of Grenada's telephone numbering plan, including number formats, dialing procedures, and essential insights for telecom professionals and system administrators. Whether setting up a communication system or ensuring regulatory compliance, this guide provides the necessary data-driven insights.

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Number Formats

Grenada adheres to the North American Numbering Plan (NANP), structuring phone numbers as follows:

General Structure

• Country Code: +1
• Area Code: 473
• Subscriber Number: 7 digits

Number Format Table

Type	Format	Example	Regex Pattern
Landline	473-2XX-XXXX	473-232-1234	^4732[0-9]{6}$
Mobile	473-4XX-XXXX, 473-5XX-XXXX	473-405-1234	^473[45][0-9]{6}$
Toll-Free	800-XXX-XXXX	800-234-5678	^800[2-9][0-9]{6}$
Premium Rate	900-XXX-XXXX	900-234-5678	^900[2-9][0-9]{6}$
Emergency	911	911	^911$

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Detailed Number Structures

Landline Numbers

• Format: 473-2XX-XXXX
• Description: Landline numbers start with '2' followed by a six-digit subscriber number.
  Regex Pattern:
  ^4732[0-9]{6}$
  

Mobile Numbers

• Format: 473-4XX-XXXX, 473-5XX-XXXX
• Description: Mobile numbers start with '4' or '5', followed by a six-digit subscriber number.
  Regex Pattern:
  ^473[45][0-9]{6}$
  

Toll-Free Numbers

• Format: 800-XXX-XXXX
• Description: Toll-free numbers start with '800', typically used for customer service.
  Regex Pattern:
  ^800[2-9][0-9]{6}$
  

Premium Rate Numbers

• Format: 900-XXX-XXXX
• Description: Premium rate numbers start with '900', often used for special services.
  Regex Pattern:
  ^900[2-9][0-9]{6}$
  

Emergency Numbers

• Format: 911
• Description: The emergency number is 911, consistent with the North American standard.
  Regex Pattern:
  ^911$
  

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Dialing Procedures

Domestic Calls

• Landline to Landline: Dial the full 7-digit number (e.g., 232-1234).
• Landline to Mobile: Dial the full 7-digit number (e.g., 405-1234).
• Mobile to Mobile: Dial the full 7-digit number (e.g., 405-1234).

International Calls

• Outgoing: Dial 011 (international prefix), followed by the country code, area code, and local number. Example: 011-44-20-12345678 for the UK.
• Incoming: International callers should dial +1 (Grenada's country code), followed by the 473 area code and the 7-digit local number. Example: +1-473-405-1234.

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Number Portability

Grenada supports mobile number portability, allowing users to retain their mobile numbers when switching between service providers. This enhances competition and provides greater flexibility for consumers.

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Major Telecom Operators and Number Ranges

Operator	Mobile Prefixes
Digicel Grenada	473-4XX-XXXX
Flow Grenada (Cable & Wireless)	473-5XX-XXXX

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ITU-T Recommendations

Grenada adheres to the ITU-T E.164 standard, which defines the international public telecommunication numbering plan, mandating a maximum length of 15 digits for international numbers, including the country code.

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Number Allocation and Management

The National Telecommunications Regulatory Commission (NTRC) is responsible for the allocation and management of telephone numbers in Grenada, ensuring efficient utilization and accommodating future growth and technological advancements.

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Technical Restrictions and Special Cases

• Golden Numbers: Premium numbers, known as "golden numbers," may be available for purchase due to their memorable nature.
• Number Blocking: Certain numbers may be blocked due to regulatory restrictions or at the request of telecom operators.

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Technical Considerations

For Developers and System Administrators

1. Validation: Ensure phone numbers are validated against the correct format using regular expressions. Example: ^473[45][0-9]{6}$ for mobile numbers.
2. Formatting: Use a consistent format (e.g., +1 473-XXX-XXXX) for readability.
3. Portability Handling: Implement logic to handle mobile number portability.
4. Internationalization: Ensure systems handle international dialing formats and prefixes.
5. Time Zone Awareness: Be mindful of time zone differences for automated calls or notifications.