Understanding Phone Numbers in Saint Kitts and Nevis

Quick Reference Guide

• Country: Saint Kitts and Nevis
• Country Code: +1 (North American Numbering Plan - NANP)
• International Prefix: 011 (for dialing out of Saint Kitts and Nevis)
• National Prefix: 1 (used for domestic calls within Saint Kitts and Nevis)

Comprehensive Overview

This guide offers a thorough examination of the telephone numbering plan in Saint Kitts and Nevis. Ideal for telecom professionals, developers, and anyone needing to understand local number formats, this resource covers number structures, dialing procedures, and regulatory standards.

Number Structure and Formats

General Number Structure

Phone numbers in Saint Kitts and Nevis adhere to the North American Numbering Plan (NANP). The standard format is:

+1 NPA NXX XXXX

• +1: Country code for Saint Kitts and Nevis (part of NANP).
• NPA: Numbering Plan Area (Area Code), which is 869 for Saint Kitts and Nevis.
• NXX: Central Office Code.
• XXXX: Subscriber Number.

Detailed Number Formats

Regular Expressions for Validation

• Geographic (Landline):

^\+1 869 [2-5]\d{2} \d{4}$

• Mobile:

^\+1 869 (48[89]|55[6-8]|66\d|76[02-7]) \d{4}$

• Toll-Free:

^\+1 800 \d{3} \d{4}$

• Premium Rate:

^\+1 900 \d{3} \d{4}$

Dialing Procedures

Domestic Dialing

• Landline to Landline: Dial 1 + 869 + NXX XXXX.
• Landline to Mobile: Dial 1 + 869 + NXX XXXX.
• Mobile to Mobile: Dial 1 + 869 + NXX XXXX.
• Mobile to Landline: Dial 1 + 869 + NXX XXXX.

International Dialing

• Outgoing International Calls: Dial 011 + Country Code + Area Code + Subscriber Number.
• Incoming Calls: Dial +1 869 + NXX XXXX.

Number Portability

• Mobile Number Portability (MNP): Available in Saint Kitts and Nevis, allowing users to retain their mobile numbers when switching between service providers.

Regulatory and Management Information

Regulatory Body

• Regulatory Authority: The National Telecommunications Regulatory Commission (NTRC) of Saint Kitts and Nevis is responsible for the allocation and management of telephone numbers.

Number Allocation and Management

• Number Allocation: Numbers are allocated according to the NANP guidelines. The NTRC oversees the allocation process, ensuring compliance with ITU-T recommendations.
• Recent Changes: No recent changes to the numbering plan have been announced.

ITU-T Standards

• ITU-T E.164: Saint Kitts and Nevis adheres to the ITU-T E.164 standard, which defines the international public telecommunication numbering plan.

Technical Considerations for Developers

1. Validation: Ensure phone numbers adhere to the NANP format using regular expressions or libraries that support NANP validation.
2. Portability: Implement checks for mobile number portability to avoid routing issues.
3. Time Zone Handling: Consider time zone differences when implementing services that interact with users in Saint Kitts and Nevis.
4. Internationalization: Ensure that your system supports international dialing formats, especially for incoming and outgoing calls.

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