No Trunk Prefix 0
Portugal dropped its domestic trunk prefix '0' in 1999. When dialing from abroad, never insert a 0 between the country code (+351) and the local number. Dial +351 followed directly by the 9-digit number.
Quick Answer
How to Call Portugal from Sao Tome and Principe
To call Portugal from Sao Tome and Principe, dial 00 + 351 + the 9-digit Portuguese number. On mobile, use +351 followed by the number. Portuguese landlines start with 2 (e.g., 21 for Lisbon) and mobiles start with 9 (e.g., 91, 92, 93, 96). There is no trunk prefix 0 after the country code.
🇸🇹From Sao Tome and Principe
To Portugal🇵🇹
$0.98
Per minute
+351
Country code
HD
Call quality
Landline rate
$0.98/min
Mobile rate
$0.98/min
Same per-minute Sayfone rate for landline and mobile.
Average call quality
Sao Tome and Principe and Portugal share deep historical, linguistic, and family ties. With over half of Sao Tome's diaspora living in Portugal, this is the most important international calling corridor for São Tomé and Príncipe. Sayfone lets you call Portugal for $0.98/min — right from your browser.
Steps at a glance
- Dial 00 (STP's international exit code) or press + on your mobile
- Dial 351 (Portugal's country code)
- Dial the full 9-digit Portuguese number (no leading 0)
Sources
- 1ITU – São Tomé and Príncipe Dialling Procedures
Source for STP exit code 00
- 2Wikipedia – Telephone numbers in Portugal
Source for Portugal country code +351 and 9-digit numbering plan
DIALING GUIDE
Step-by-Step: Call Portugal from Sao Tome and Principe
Follow these steps to connect with landline or mobile numbers in Portugal from Sao Tome and Principe.
Dial the International Exit Code
From a landline in Sao Tome and Principe, dial 00 to access the international network. From a mobile phone, you can press and hold 0 to produce the + symbol, which replaces the exit code.
00 or +
Dial Portugal's Country Code
Immediately after the exit code (or +), dial 351 — Portugal's international country code.
00 351 or +351
Dial the 9-Digit Portuguese Number
Enter the complete 9-digit Portuguese phone number. For landlines, this begins with 2 (e.g., 21 for Lisbon, 22 for Porto). For mobiles, it begins with 9 (common prefixes: 91, 92, 93, 96). Do not add a leading 0 — Portugal eliminated its trunk prefix in 1999.
00 351 21 234 5678 (Lisbon landline) or +351 912 345 678 (mobile)
Wait for the Connection
The call will route through the international network. You should hear a ringing tone within a few seconds. If the call does not connect, double-check the number format — the most common mistake is adding a 0 after the country code.
Dialing format reference
+351
Use these patterns when entering a full international number to +351.
Mobile
+351 9XX XXX XXX
Landline
+351 2X XXX XXXX
- +351 21 234 5678 (Lisbon landline)
- +351 22 234 5678 (Porto landline)
- +351 912 345 678 (mobile)
- +351 289 123 456 (Faro landline)
Major city area codes
Lisbon21
Porto22
Coimbra239
Faro289
Braga253
Funchal (Madeira)291
Ponta Delgada (Azores)296
Sources
- 1Wikipedia – Telephone numbers in Portugal
Confirms closed 9-digit plan and no trunk prefix since 1999
- 2HowToPhoneTo – São Tomé and Príncipe
Confirms STP exit code is 00 per ITU data
- 3Ace Money Transfer – Portugal Country Code Guide
Detailed Portugal dialing format and area code reference
IMPORTANT RULES
Dialing Rules for Calling Portugal from STP
Keep these rules in mind to avoid failed connections and unexpected charges when calling Portugal from Sao Tome and Principe.
All Numbers Are 9 Digits
Every Portuguese phone number — landline or mobile — is exactly 9 digits long (after the +351 country code). If the number you have is shorter or longer, verify it before dialing.
Landline Prefix Identifies the Region
Landline numbers begin with 2. The first two or three digits identify the geographic area: 21 = Lisbon, 22 = Porto, 239 = Coimbra, 289 = Faro, and so on. The area code is part of the 9-digit number.
Mobile Prefixes Start with 9
Portuguese mobile numbers start with 9. Common mobile prefixes include 91, 92, 93, and 96. Due to number portability, the prefix does not guarantee a specific carrier.
Special Numbers May Not Work Internationally
Portuguese toll-free (800), shared-cost (808), and premium-rate (707) numbers generally do not work when dialed from outside Portugal or may be charged differently. Request a geographic alternative number if needed.
STP Exit Code Is 00
When calling internationally from Sao Tome and Principe, the exit code is 00. On mobile phones, you can substitute this with the + symbol for convenience.
TIMING & TIPS
Best Times and Tips for Calling Portugal from STP
Sao Tome and Principe and Portugal share the same base time zone (UTC+0 / WET), but Portugal observes daylight saving time in summer (UTC+1). Here's how to time your calls well.
🇵🇹
Since both countries share Portuguese as the official language, language barriers are not a concern. Focus on timing your call to match the recipient's availability.
Time & windows
Winter (Nov – Mar)
Same time
STP and Portugal mainland are both on UTC+0 (no time difference)
Summer (Apr – Oct)
Portugal is 1 hour ahead
Portugal moves to WEST (UTC+1) during daylight saving time
🇸🇹Best for personal calls
6:00 PM – 9:00 PM (Portugal time)Evenings after work — most people are home and available
🇸🇹Best for business calls
9:00 AM – 12:00 PM (Portugal time)Morning business hours before the lunch break
🇸🇹Avoid calling
After 10:00 PM (Portugal time)Late-night calls are considered rude unless pre-arranged
Calling tips
- Sao Tome and Principe and Portugal share Portuguese as the official language, so no translation is needed.
- During Portugal's summer (DST), add 1 hour to your local STP time to get Portugal time.
- If you're calling a Portuguese mobile, the recipient may be anywhere in the EU — ask before calling at unusual hours.
- Save Portuguese contacts in +351 format for universal compatibility across devices and services.
- Use Sayfone from your browser — no app download needed — for affordable calls at $0.98/min.
Business etiquette
- In Portuguese business culture, punctuality is appreciated but flexibility is common — don't worry if a meeting call starts a few minutes late.
- Address business contacts formally at first (Senhor/Senhora + surname) until invited to use first names.
- Business calls during lunch hours (1:00 PM – 2:30 PM) are often avoided in Portugal.
- Confirm call appointments via SMS or email beforehand, especially for first-time contacts.
Sources
- 1TimeAndDate – Portugal Time Zone
Portugal mainland WET/WEST timezone reference
TROUBLESHOOTING
Common Issues When Calling Portugal from STP
If your call to Portugal isn't connecting, check these common problems and solutions.
Call Doesn't Connect
The most common cause is including a trunk prefix 0 after dialing +351. Portugal does not use a domestic trunk 0 for international calls. Remove any 0 between the country code and the local number.
Wrong Number of Digits
Portuguese numbers are exactly 9 digits after the country code. If your number is shorter or longer, verify it with the recipient. Older number formats may be outdated since Portugal's numbering changed in 1999.
Toll-Free or Special Numbers Not Reachable
Numbers beginning with 800 (toll-free), 808 (shared-cost), or 707 (premium) often cannot be reached from outside Portugal. Ask the recipient for a geographic number starting with 2 instead.
Poor Call Quality or Dropped Calls
International call quality from Sao Tome and Principe can vary depending on network conditions. If you experience static or dropouts, try calling again at a different time or use a browser-based calling service like Sayfone over a stable internet connection.
High Charges from Local Carrier
Traditional carrier rates for international calls from STP can be expensive. Consider using Sayfone at $0.98/min for calls to Portugal — no SIM card or app install required.
Sources
- 1Wise – Portugal Country Code Guide
Common reasons international calls fail
Savings
See what you could save
Adjust the tools below to compare Sayfone with typical retail pricing for calls to Portugal. Start with one call, then layer on monthly volume to see the bigger picture.
How to use these tools
- Sayfone uses your live rate for calls to Portugal — the same basis as the rest of this page.
- First, estimate savings on a single call length. Then, model a full month of minutes versus typical retail benchmarks.
- Retail competitor rows are illustrative — not a quote from any carrier.
One call — instant savings
Set duration and country. See Sayfone vs. an illustrative retail rate for the same call.
I'm calling…
▾
12 minutes
1 min10 min20 min30 min40 min50 min1 hr
Enable enterprise discount
Save additional 40% (enterprise)
Your call
Your call will cost
$11.76
$0.98 per minute
Sayfone$11.76$0.98 / min
Competitors$29.40$2.45 / min
Your savings$17.64$1.47 / min
That's 60% less than competitors
Every month — stack it up
Set monthly minutes and call type. Bars compare Sayfone to common retail benchmarks for the same volume.
Drag slider to adjust
220
min / month
AT&T / Verizon$10,564
~$48.02/min
T-Mobile$7,977
~$36.26/min
Calling cards$4,743
~$21.56/min
Google Voice$1,078
~$4.90/min
Sayfone$216
$0.980/min
Annual saving vs. AT&T
Based on 220 min/month
$124,186
Before you go
Still planning your call to Portugal?
Open the full Sao Tome and Principe to Portugal guide with rates and tools, or check what it costs to call Portugal.
Dialing guideRates
Sao Tome and Principe to Portugal calling guide
Per-minute rates, savings calculator, and what to expect on this route.
What it costs to call Portugal
See Sayfone’s per-minute rate for Portugal and how it compares before you dial.
Route guides from Sao Tome and Principe
FAQ
Frequently Asked Questions About Calling Portugal from STP
Answers to common questions about dialing Portugal from Sao Tome and Principe, including codes, costs, and tips.
Have another question about calling Portugal? Reach out to Sayfone support.
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