Verification

OTP SMS in Sao Tome and Principe

Verify phone numbers and secure logins in Sao Tome and Principe with OTPs that arrive in seconds. eSMS Africa delivers one-time passwords to CST & Unitel on priority routes, with a managed Verify API that handles generation, delivery, retries and checks.

Start verifying free See Verify

Direct routes to 2 networks Delivery reports STN 1.9413 per SMS

Networks in Sao Tome and Principe

CSTUnitel

Country code

+239

Status

Production

Why eSMS Africa

OTP SMS in Sao Tome and Principe, done properly

Sub-second OTP delivery

One-time passwords to Sao Tome and Principe route on priority paths to CST, Unitel so users get their code in seconds, not minutes - the difference between a signup completed and abandoned.

Managed Verify API

Let eSMS Verify generate the code, send it, handle resends and check it for you - or send OTPs yourself over the SMS API. Both work across Sao Tome and Principe.

2FA & fraud controls

Add SMS two-factor authentication to logins and payments in Sao Tome and Principe, with rate limits and anti-fraud checks to block artificially inflated traffic.

Branded OTP sender IDs

Send OTPs from a recognizable sender ID in Sao Tome and Principe so users trust the code and phishing is harder.

Step by step

How to send an OTP in Sao Tome and Principe

1
Enable Verify. Create an account and enable the eSMS Verify API.
2
Start a verification. Call the start endpoint with the user's Sao Tome and Principe number (+239...).
3
Deliver the code. eSMS Africa generates the one-time code and delivers it to CST & Unitel in seconds.
4
Check the code. Ask the user for the code and call the check endpoint to verify it.

Integrate in minutes

Send your first SMS to Sao Tome and Principe

curl -X POST https://api.esmsafrica.io/v1/sms/send \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "to": "2399812345",
    "from": "MyBrand",
    "message": "Your verification code is 123456"
  }'

Full REST reference, SMPP details and SDKs for Node, Python, PHP and Go in the API documentation.

Local pricing