Check whether a São Tomé & Príncipe number is valid, detect its line type, and convert it to E.164, international, or national format — instantly and free. Powered by Google's libphonenumber.
| Country | São Tomé & Príncipe (ST) |
| Country calling code | +239 |
| Example number (international) | +239 981 2345 |
| National format | 981 2345 |
| E.164 format | +2399812345 |
| RFC 3966 (tel: URI) | tel:+2399812345 |
| Example line type | mobile |
To dial a São Tomé & Príncipe number from abroad, start with the country code +239 followed by the national subscriber number. In E.164 — the format every SMS gateway, CRM, and payment provider expects — the same number is stored as +2399812345: a leading +, the country code, and the national number with no spaces or separators.
The interactive tool above runs entirely in your browser. For server-side validation at scale — sign-up forms, lead cleaning, SMS routing — call the API. One GET request, no SDK, works in any language.
# Validate a São Tomé & Príncipe number via the API curl "https://phone-validation-and-formatting.p.rapidapi.com/v1/validate?number=%2B2399812345" \ -H "X-RapidAPI-Key: YOUR_KEY" \ -H "X-RapidAPI-Host: phone-validation-and-formatting.p.rapidapi.com"
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The country calling code for São Tomé & Príncipe is +239. A full number in international (E.164) form looks like +2399812345.
A typical São Tomé & Príncipe mobile number is written +239 981 2345 internationally, 981 2345 nationally, or +2399812345 in E.164 format.
Send one GET request to the Phone Validation API with the number and country code "ST". The response tells you whether it is valid, the line type, and every standard format. A free tier is available.
Validity, line-type detection, and every format from a single endpoint — 240+ countries, sub-50ms from the edge.
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