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phone number standards
phone number standards
Sent TeamMar 8, 2026 / phone number standards / Article
São Tomé and Príncipe Phone Numbers: Complete +239 Country Code Guide
Complete guide to São Tomé and Príncipe phone number format, validation, and integration. Learn +239 country code structure, CST and Unitel STP operators, E.164 formatting, and AGER regulatory requirements.