São Tomé & Príncipe country code, +239 explained.
Everything you need to call São Tomé & Príncipe with Twiching — full dialing format, step-by-step guide, and Tier-1 CLI routes that land every call.
São Tomé & Príncipe
São Tomé · Africa
· COUNTRY INFO · VERIFIED
ISO Alpha-2
ST
Capital
São Tomé
Region
Africa
Timezone
UTC+0
· DIALING GUIDE · VERIFIED
FULL DIAL FORMAT
011 · +239 · XXXXXXX
How São Tomé & Príncipe numbers break down
A complete number to São Tomé & Príncipe follows this pattern. Twiching adds the exit and country codes automatically when you dial from the app.
EXIT CODE
Dial from the US/Canada to leave the country.
COUNTRY CODE
Routes the call directly into São Tomé & Príncipe.
LOCAL NUMBER
The subscriber's local number.
COMPLETE NUMBER FORMAT
011 · +239 · XXXXXXX
São Tomé & Príncipe on the map
São Tomé · Africa
ROUTE
Tier-1 Direct
CLI
Verified
ASR
60%+ min
SIP trunking and local numbers for São Tomé & Príncipe
Instead of leasing a physical line in São Tomé & Príncipe, a Twiching SIP trunk routes your existing PBX or softphone traffic through a local +239 number — same call quality, none of the on-the-ground infrastructure.
Local +239 caller ID
Calls display a recognisable São Tomé & Príncipe number instead of an unfamiliar international one.
SIP trunking
Route your existing PBX or softphone through Twiching's Tier-1 trunk — no hardware swap.
Minutes to provision
Numbers activate in the dashboard the same day, with no on-the-ground carrier contract.
+239
São Tomé & Príncipe · ready to provision today
Built for reliable delivery into São Tomé & Príncipe
São Tomé & Príncipe isn't treated as a secondary market — it runs on the identical direct-carrier routing and delivery guarantees as every other country in the directory.
São Tomé & Príncipe
+239
191
Countries in directory
SÃO TOMÉ & PRÍNCIPE INCLUDED
99.97%
Call delivery rate
STIR/SHAKEN
500+
Carrier interconnects
TIER-1 DIRECT
60%+
Guaranteed ASR
REAL-TIME ROUTING
How São Tomé & Príncipe phone numbers are structured
Numbering Format
COUNTRY
+239
LOCAL
XXXXXXX
Under country code +239, São Tomé & Príncipe runs a closed numbering plan — just a 7-digit subscriber number after the country code, no area code required.
Carriers & language
3 major networks cover São Tomé & Príncipe (CST (Companhia Santomense de Telecomunicações), Unitel T+, Africell STP), against 42% internet penetration. VoIP is permitted and regulated by Agência Geral de Regulação (AGER). Because Portuguese is the primary language and São Tomé and Príncipe Dobra the local currency, both should inform IVR scripts, SMS content, and support hours.
Africa context
Across African markets, mobile-first numbering dominates and Tier-1 interconnects are the key to consistent call delivery and CLI presentation.
Skipping the exit code
Reaching São Tomé & Príncipe from the US requires the 011 exit code ahead of +239 — skip it and the call won't connect.
Adding an area code that doesn't exist
São Tomé & Príncipe uses a closed plan — dial the +239 country code then the 7-digit subscriber number directly, with no area code.
Ignoring the time difference
UTC+0 governs local business hours in São Tomé & Príncipe; confirm the time there before placing the call.
Compliance, carriers & rates for São Tomé & Príncipe
Permitted — AGER regulated
Regulated by Agência Geral de Regulação (AGER)
São Tomé & Príncipe's regulatory posture under Agência Geral de Regulação (AGER) is permissive toward VoIP, meaning a business can start calling and texting into the country without a separate compliance process.
- AGER regulates all electronic communications in São Tomé & Príncipe and requires licensing for VoIP services.
- International service providers must obtain gateway authorization from AGER before terminating traffic.
- Consumer protection and CLI transparency rules apply to virtual number providers operating in the country.
Direct Tier-1 interconnect with CST (Companhia Santomense de Telecomunicações) — no wholesale transit in between.
US → São Tomé & Príncipe
$0.40/min
São Tomé & Príncipe → US
$0.30/min
Billed per second, not rounded to the minute
How businesses use a São Tomé & Príncipe number
Look like a local business
A +239 number with São Tomé & Príncipe caller ID reads as domestic to the person picking up — unfamiliar international numbers get screened far more often.
Africa outbound & support
Run sales and support lines into São Tomé & Príncipe over Tier-1 routes that interconnect with networks like CST (Companhia Santomense de Telecomunicações).
Built for UTC+0 hours
Multi-country teams route São Tomé & Príncipe calls to whoever's actually awake and working in UTC+0, without juggling separate numbers per shift.
No local carrier contract needed
Entering São Tomé & Príncipe over SIP trunking skips the local carrier contract entirely — the number is provisioned and billed the same way as every other Twiching market.
FAQ
Calling São Tomé & Príncipe — frequently asked questions
São Tomé & Príncipe uses a closed numbering plan with no leading trunk 0 to worry about — just the country code followed directly by the subscriber number. That makes the dial string identical whether you're calling from inside or outside the country.
São Tomé & Príncipe's ISO 3166-1 alpha-2 code is ST, distinct from its dialing code (+239). The ISO code is used in things like domain names and shipping forms, while the dialing code is what actually routes a phone call.
Yes — calls to São Tomé & Príncipe are billed per second, not rounded up to the minute, starting at $0.40/min. Per-second billing means a 45-second call costs less than a full minute, unlike carriers that round every call up.
São Tomé & Príncipe uses a closed plan: a single 7-digit subscriber number directly after the country code, with no separate prefix layer. Every number in the country is the same total length as a result.
No — São Tomé & Príncipe's closed plan has no trunk prefix; the country code is followed directly by the subscriber number. That keeps the dial format identical whether the call originates domestically or from abroad.
São Tomé & Príncipe's local currency is São Tomé and Príncipe Dobra, which is worth factoring into any pricing or invoicing shown to customers there. Twiching's own per-minute rates to and from São Tomé & Príncipe are quoted in USD regardless of the local currency.
Full country code directory
São Tomé & Príncipe is one of several Africa markets Twiching covers — browse the rest of the directory below to compare dial codes, VoIP rules, and rates across the region. All 190 other countries are listed below, Africa first.
Get started
Get a São Tomé & Príncipe number.
See what a real phone stack does.
Phone numbers, voice, SMS and AI on one account. Direct Tier-1 routing into São Tomé & Príncipe from day one.
Compliance with applicable regulations required.