+239 · UTC+0

Best Time to Call
Sao Tome and Principe
from the United States

Sao Tome and Principe's +239 code covers one of Africa's smallest island nations, served primarily by CST and UNITEL T+. From the US East Coast, business hours in Sao Tome and Principe fall between 4:00 AM and 12:00 PM EST.

Best EST: 4:00 AM – 12:00 PM
Mon–Fri
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// Best Time to Call

When to Call Sao Tome and Principe

A 9-to-5 day in São Tomé and one in New York share 3 hours: 9:00 AM–12:00 PM ET.

Ideal

Morning

local

EST (UTC−5)
PST (UTC−8)
Ideal

Afternoon

local

EST (UTC−5)
PST (UTC−8)
Avoid

Avoid

local

EST (UTC−5)
PST (UTC−8)
Sao Tome and Principe Business Hours → US Time Zones
Local TimeUTCEST / New YorkCST / ChicagoPST / LA

US columns use standard time (EST/CST/PST); between the second Sunday in March and the first Sunday in November, US clocks are one hour later.

// Calling Guide

How to call Sao Tome and Principe — the short version.

Dialing steps

  1. 1Dial your exit code — 011 from the US and Canada, 00 from most of Europe.
  2. 2Add the Sao Tome and Principe country code: +239.
  3. 3Enter the national number. If it's written with a domestic trunk prefix (often a leading 0), that prefix is usually dropped after the country code.

Best time to call

  • 9:00 AM – 5:00 PM in São Tomé is 4:00 AM – 12:00 PM EST.
  • A 9-to-5 day in São Tomé and one in New York share 3 hours: 9:00 AM–12:00 PM ET.

Quick tips

  • Working days: Mon–Fri.
// Calling Etiquette

Calling etiquette in Sao Tome and Principe

Calling culture

Business culture in Sao Tome and Principe, conducted in Portuguese, values warmth and relationship-building before business matters.

Working week

Mon–Fri.

Free tools

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Frequently Asked

Calling Sao Tome and Principe — Common Questions

Everything you need to know about reaching contacts in Sao Tome and Principe.

Calls outside local business hours in Sao Tome and Principe are less likely to be answered live, but Rozper's AI receptionist and voicemail-to-text still capture the call and notify your team immediately — so you're not limited to the 4:00 AM–12:00 PM EST overlap.

A recognizable local number helps build trust with consumers in this small, relationship-driven island market.

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