Sao Tome and Principe Phone Numbers: Format, Area Code & Validation Guide - phone-number-standards -

Frequently Asked Questions

To call internationally from Sao Tome and Principe, dial the international prefix 00, followed by the destination country code and the subscriber number.
The country code for São Tomé and Príncipe is +239. This code is required when dialing into the country from abroad and should always be included when storing phone numbers in international format (E.164).
Sao Tome and Principe phone numbers follow the E.164 international standard, which includes the +239 country code followed by a 7-digit subscriber number. For example, a complete number would look like +239 XXX XXXX.
You can validate Sao Tome and Principe phone numbers using regular expressions. Distinct patterns exist for geographic (+239 22X XXXX), mobile (+239 9XX XXXX), emergency (1XX), and short code numbers. Always store numbers in E.164 format (+239XXXXXXXX) for consistency.
Including the country code (+239), Sao Tome and Principe phone numbers have a total of 9 digits. The subscriber number itself consists of 7 digits, which can be further categorized into fixed-line (22X XXXX) and mobile (9XX XXXX) numbers.
+239 is the internationally assigned country code for Sao Tome and Principe, as defined by the International Telecommunication Union (ITU). Using this code ensures global interoperability and correct routing of calls to and from the country.
Mobile numbers in Sao Tome and Principe start with 9 and follow the format +239 9XX XXXX. Unitel STP is the primary mobile operator in the country, and using this specific format is crucial for proper routing.
For domestic calls within Sao Tome and Principe, simply dial the 7-digit subscriber number. The initial digits (2 for landlines, 9 for mobile) determine the routing.
When calling Sao Tome and Principe from another country, dial the country code (+239) followed by the 7-digit local number. Ensure you include the plus sign (+) before the country code for proper international dialing.
The Autoridade Geral de Regulação (AGER) regulates telecommunications in Sao Tome and Principe. AGER oversees number assignments, spectrum management, and enforces compliance with international standards like ITU-T E.164.
Always use the E.164 format (+239XXXXXXXX) when storing and exchanging phone numbers with APIs and databases. This practice guarantees consistency, simplifies data management, and ensures compatibility with international systems.
The main telecom operators in Sao Tome and Principe are CST (Companhia Santomense de Telecomunicações) for fixed-line services (22XXXXXX numbers) and Unitel STP for mobile services (9XXXXXXX numbers).
No, number portability is not currently available in Sao Tome and Principe. The number's prefix remains tied to the original operator, which should be considered during application development.
The emergency number in Sao Tome and Principe is 112. It's essential to allow calls to this number regardless of any other validation rules within your application.
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