Phone Numbers in Saint Helena, Ascension, and Tristan da Cunha

Quick Reference

• Country: Saint Helena, Ascension, and Tristan da Cunha
• Country Code: +290
• International Prefix: 00
• National Prefix: None
• Regulatory Authority: Saint Helena Government Communications Division

Overview

This guide provides a comprehensive overview of the telephone numbering system in Saint Helena, Ascension, and Tristan da Cunha. It details phone number structures, dialing procedures, and regulatory guidelines, making it a valuable resource for telecom professionals and businesses.

Number Formats

General Number Structure

Phone numbers in these territories have a consistent format, differing slightly between landline and mobile services:

Type	Format	Example
Landline	2[0-57-9]XXXX	2201234
Mobile	[5-6]XXXX	51234
Special Services	8XXXX	81234

Regular Expressions for Number Validation

Use these regular expressions to validate phone numbers:

• Landline Numbers:
  /^2[0-57-9]\d{4}$/
  

• Mobile Numbers:
  /^[5-6]\d{4}$/
  

• Special Services:
  /^8\d{4}$/
  

Dialing Procedures

Domestic Dialing

• Landline to Landline: Dial the 5-digit number directly.
• Landline to Mobile: Dial the 5-digit number directly.
• Mobile to Mobile: Dial the 5-digit number directly.

International Dialing

• Outgoing International Calls:
  Dial 00, followed by the country code, area code, and subscriber number.
  Example: To call the UK, dial 00 44 XXXXXXXXXX.

• Incoming International Calls:
  Dial +290, followed by the 5-digit local number.
  Example: From the UK to Saint Helena, dial +290 2201234.

Recent and Upcoming Changes

Currently, there are no recent or planned changes to the numbering plan in these territories. The system remains stable as per the regulatory authority.

Number Portability

Saint Helena, Ascension, and Tristan da Cunha do not support number portability. Subscribers must change numbers when switching providers.

Major Telecom Operators

Operator	Service Type	Number Ranges
Sure South Atlantic	Landline	2XXXX
Sure South Atlantic	Mobile	5XXXX, 6XXXX

ITU-T Recommendations

The numbering plan complies with ITU-T Recommendation E.164, ensuring global consistency in phone number formats.

Number Allocation and Management

The Saint Helena Government Communications Division manages number allocations, ensuring adherence to ITU-T standards.

Technical Considerations for Developers

Developers should consider the following:

1. Validation: Use provided regex for accurate validation.
2. Formatting: Store and display numbers correctly, including the country code.
3. Dialing Logic: Implement correct dialing procedures for calls.
4. No Number Portability: Systems must account for static number allocations.