Home phone number São Tomé and Príncipe
São Tomé and Príncipe Phone Number validator
How the phone number format works
- Format
- São Tomé and Príncipe phone number in national or international (+239) format
- Example
- +2399812345
Things to watch for
- Accepts national or international (E.164, e.g. +239...) format
- Validated with Google's libphonenumber; confirms the number is possible/valid for this country, not that it is currently assigned or reachable
^[+]?[0-9 ()\-]{6,}$A São Tomé and Príncipe phone number is 7 digits under the country code +239. A former Portuguese colony made up of two volcanic islands in the Gulf of Guinea, São Tomé and Príncipe was briefly the world’s largest cocoa producer in the early 1900s, and remains one of Africa’s smallest nations by both population and land area today, with its capital and namesake island hosting most of the country’s economic activity.
How this validator works
Enter the number in national form (9812345) or full international form (+2399812345); this tool checks the 7-digit length and leading-digit pattern against São Tomé and Príncipe’s real numbering plan using Google’s libphonenumber, entirely in your browser. As one of the smaller entries in the Gulf of Guinea region, don’t confuse its +239 code with nearby Gabon’s +241 or Equatorial Guinea’s +240 — all similarly small former colonial territories with entirely separate numbering plans.
What a pass doesn’t tell you
A pass confirms the digits form a real São Tomé and Príncipe number shape — it doesn’t confirm the SIM is active or the landline connected, a separate carrier-side question this tool doesn’t try to answer.
Scope: useful for catching a wrong-code mix-up with a Gulf of Guinea neighbor before a São Tomé number reaches a form — not a substitute for a real lookup service.
Content last reviewed 2026-08-09.
phone number FAQ
Was São Tomé and Príncipe once a major cocoa producer?
Yes — in the early 20th century, this small island nation was briefly the world's largest producer of cocoa, built on Portuguese-run plantations. Production has declined sharply since independence, but cocoa remains culturally and economically significant to the country today.
How small is São Tomé and Príncipe?
It's one of the smallest countries in Africa both by population and land area, consisting of just two main volcanic islands in the Gulf of Guinea off the coast of Gabon — small enough that its entire national phone numbering plan fits in a single 7-digit format.
Does a valid check confirm a São Tomé number is currently active?
No. It only confirms the 7 digits match a real numbering pattern under +239 — not that the SIM is active, which needs a carrier-side lookup this free tool doesn't perform.