International Calling Rates
Reach family, friends, and businesses across the islands with affordable, browser-based calling. No downloads required.
Sao Tome and Principe
Country code +239
$0.08
Landline
$0.08
Mobile
~60%
vs retail*
Same per-minute Sayfone rate for landline and mobile calls.
Average call quality
*Illustrative savings vs 2.5× directory rate — not a carrier quote.
Simple steps
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220
min / month
~$3.92/min
~$2.96/min
~$1.76/min
~$0.40/min
$0.080/min
Annual saving vs. AT&T
Based on 220 min/month
GETTING STARTED
Placing an international call to São Tomé and Príncipe takes just a few steps—no special hardware or app installs required.
Instant access
Visit Sayfone from any modern browser on your phone, tablet, or computer. No app to download or install.
Dialer
+00 000 000 00
Type the full international number including +239 and the 7-digit local number. Our dialer formats it automatically.
HD audio from your browser
Hit call and you're connected at 8¢/min. Pay only for what you use with clear per-minute billing—no subscriptions required.
UNDERSTANDING THE COSTS
São Tomé and Príncipe is one of Africa's smallest and most isolated island nations. Several structural factors make international calling to the islands more costly than calls to larger, better-connected countries.
São Tomé and Príncipe sits in the Gulf of Guinea, over 250 km off the African coast. The country relies on a single submarine cable—the ACE (Africa Coast to Europe)—for international connectivity. This limited redundancy keeps transit costs high.
With a population under 230,000 and only about 147,000 mobile connections as of 2024, the total call volume is tiny. Carriers cannot spread infrastructure costs over a large user base, which keeps per-minute termination rates elevated.
The telecom market is served by just two operators—CST (the incumbent, partly Portuguese-owned) and Unitel STP. With only two carriers, competitive pressure to lower international termination rates remains limited compared to more liberalized markets.
The islands experience regular electricity outages due to reliance on small thermal power plants. These outages can disrupt telecom equipment, adding operational costs that are ultimately passed through to call termination fees.
Sources
Supports claims about limited telecom infrastructure
Supports subscriber count and penetration data
Official ITU numbering reference for +239
CALLING OPTIONS COMPARED
There are a few ways to reach someone in São Tomé and Príncipe from abroad. Each option comes with different trade-offs in cost, reliability, and convenience.
Sayfone (Browser Calling)
Call directly from your browser at a flat 8¢/min with no downloads or subscriptions. Works on any device with an internet connection and delivers HD voice quality to both landlines and mobiles.
Traditional Carrier (AT&T, T-Mobile, etc.)
Major US carriers charge steep per-minute rates for calls to São Tomé and Príncipe. Some plans don't include the country at all, leading to surprise charges. Reliable connection but very costly.
International Calling Cards
Prepaid calling cards have been a traditional option for diaspora callers but often come with hidden connection fees, expiration dates, and inconsistent quality. Increasingly hard to find for small island destinations.
WhatsApp / Messenger Voice Calls
Free over-the-internet calls work when both parties have a strong data connection, but internet penetration in São Tomé and Príncipe is extremely low and broadband quality is poor. Calls frequently drop or suffer from heavy latency.
Skype / VoIP Services
VoIP services can call São Tomé and Príncipe numbers, but rates vary and some services have limited coverage for this destination. Credit-based billing can be confusing for occasional callers.
Bar lengths reflect relative cost tiers for each option — not survey percentages.
WHY FREE APPS FALL SHORT
Free calling apps like WhatsApp and Messenger depend on both callers having a stable internet connection. In São Tomé and Príncipe, that's a significant barrier.
Sayfone routes your call to the recipient's actual phone number over the local telephone network in São Tomé and Príncipe. They answer a normal phone call—no app, no data plan, no Wi-Fi required on their side.
The problem
Only about 1% of residents in São Tomé and Príncipe have fixed broadband access. Even mobile data coverage, while growing with Unitel STP's recent 4G launch, remains limited outside the capital. The person you're calling may simply not have a usable data connection.
Available broadband in São Tomé and Príncipe has historically been described as low quality and very expensive. Many households cannot afford sustained data plans suitable for voice-over-IP calling, making app-based calls impractical for everyday use.
Regular electricity outages across the islands mean that even when internet infrastructure exists, it may go offline unpredictably. A dropped power supply means a dropped WhatsApp call—mid-conversation.
Sources
Supports low internet penetration data
CALLING TIPS & ETIQUETTE
São Tomé and Príncipe is on Greenwich Mean Time (GMT/UTC+0) year-round with no daylight saving time. Here's how to time your calls and navigate local calling culture.
São Tomé and Príncipe Time Zone
GMT (UTC+0)
No daylight saving time
US Eastern → STP
+5 hours
When it's 9 AM in New York, it's 2 PM in São Tomé
US Pacific → STP
+8 hours
When it's 9 AM in Los Angeles, it's 5 PM in São Tomé
UK → STP
Same time (GMT)
No offset during UK winter; +1 hour during BST
Portuguese Is the Official Language
São Tomé and Príncipe is a Portuguese-speaking country. If you're calling a business or government office, having basic Portuguese greetings ready is helpful. Most younger residents in the capital may understand some French or English, but don't count on it outside São Tomé city.
Numbers Have No Area Codes
Since 2010, all phone numbers in São Tomé and Príncipe are 7 digits with no area codes. Simply dial +239 followed by the 7-digit number. Mobile numbers begin with 9 and landlines typically begin with 22.
Be Patient with Connections
Due to limited infrastructure and occasional power outages, calls may take a moment to connect or you may experience brief delays. If a call doesn't go through, try again after a minute.
Greet Warmly Before Business
Santomean culture values personal relationships. Begin calls with a warm greeting and ask about the person's well-being before moving to business matters. Rushing to the point may be perceived as impolite.
Expect a Relaxed Pace
The islands operate on a more relaxed schedule than many Western business cultures. Meetings and return calls may not happen exactly on time. Allow flexibility and avoid showing frustration with delays.
Business Hours Are Typically 8 AM–3 PM
Government offices and many businesses operate from roughly 8 AM to 3 PM local time, Monday through Friday. The afternoon heat often leads to shorter working hours, so morning calls tend to be most productive.
Sources
Supports GMT/UTC+0 time zone claim
POPULAR DESTINATIONS
Most international calls to São Tomé and Príncipe are directed to a handful of population centers. Here are the key destinations and tips for reaching them.
São Tomé
São Tomé city is the capital and largest settlement, home to most government offices, businesses, and the international airport. The vast majority of international calls terminate here.
Best time to call: 9 AM–8 PM local time (GMT)
Photo brief: Unsplash São Tomé city waterfront colonial architecture tropical
Santo António
Santo António is the main town on Príncipe island and serves as the regional administrative center. It's much smaller and quieter than São Tomé, with a tight-knit community.
Best time to call: 9 AM–7 PM local time (GMT)
Photo brief: Pexels Príncipe island tropical village green hills
Trindade
Located just south of the capital, Trindade is the second-largest settlement on São Tomé island and a residential hub for families who work in the capital area.
Best time to call: 6 PM–9 PM local time (GMT) for personal calls
Photo brief: Unsplash tropical African town residential hillside
Neves
Neves is a port town on the northern coast of São Tomé island. It's a key point for fishing communities and agricultural trade in the northern districts.
Best time to call: 8 AM–6 PM local time (GMT)
Photo brief: Pexels tropical fishing village coastal Africa
DIALING GUIDE
São Tomé and Príncipe uses a simple numbering system with 7-digit national numbers and no area codes. Here's everything you need to format your call correctly.
+239 9XX XXXX
+239 22X XXXX
| City / region | Code |
|---|---|
| São Tomé (all landlines) | 22 |
| Santo António / Príncipe | 22 |
Sources
Official ITU reference for 7-digit NSN format
Supports 7-digit NSN and no area codes
FREQUENTLY ASKED QUESTIONS
Answers to the most common questions about international calls to São Tomé and Príncipe, from pricing and dialing to connectivity and timing.
Have a question not answered here? Our support team is ready to help.
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