Do I need to download an app to use Kinvo?

No. Kinvo works entirely in your browser using WebRTC technology. Just sign up, add credits, and start calling. It works on Chrome, Firefox, Safari, and Edge on any device with a microphone.

How does the Kinvo credit system work?

Buy credits in preset amounts ($5, $10, $20, $50, or $100) or a custom amount. Each call deducts credits based on the per-minute rate for that country plus a $0.05 connection fee (only charged when the call is answered). Credits never expire. Larger packs include bonus credits: $20 pack gets +$1, $50 gets +$5, $100 gets +$15.

What countries can I call with Kinvo?

Kinvo supports calls to over 150 countries including the US, UK, Canada, Australia, India, Germany, France, Japan, Brazil, Mexico, Philippines, and most of Europe, Asia, Africa, and South America. Both landline and mobile numbers are supported.

Is Kinvo call quality good?

Yes. Kinvo uses WebRTC with HD voice codecs for crystal clear audio. All calls are encrypted end-to-end. Call quality is typically better than traditional phone calls, with real-time quality indicators showing latency and packet loss.

Can I use my own phone number as caller ID on Kinvo?

Yes. You can verify your personal phone number through Kinvo's caller ID feature, and recipients will see your real number when you call. You can also purchase virtual phone numbers in the US, UK, Canada, and Australia.

Do Kinvo credits expire?

No. Your credits stay in your account indefinitely until you use them. There are no hidden fees, no monthly minimums, and no expiration dates.

Is Kinvo a good alternative to Skype for international calls?

Yes. Kinvo was built specifically to fill the gap left by Skype's shutdown in May 2025. Like Skype, Kinvo offers affordable international calls with a pay-as-you-go model. Unlike Skype, Kinvo requires no app download — calls are made directly from the browser. Kinvo supports 150+ countries with HD WebRTC voice quality, team accounts, and caller ID verification.

How much do international calls cost with Kinvo?

Rates vary by country. Calls to US and UK landlines start from $0.01/min. Mobile rates are typically higher. There is a $0.05 connection fee per call, charged only when the call is answered. You can check exact rates for any country before you dial. Every new account gets a free 1-minute test call.

What is the cheapest way to call internationally from a browser?

Kinvo is one of the most affordable browser-based international calling services. With rates starting from $0.01/min for popular destinations, no subscription fees, and credits that never expire, it is significantly cheaper than traditional phone plans or calling cards. The pay-as-you-go model means you only pay for the minutes you use.

Does Kinvo support team or business accounts?

Yes. Kinvo offers team accounts with shared credit wallets, member management, per-user spending limits, and admin dashboards with per-member call analytics. Teams are created with a $150 minimum credit purchase, with no seat limits.

All country codes

Africa

Sao Tome and Principe Country Code: +239

The international calling code for Sao Tome and Principe is +239. You need this code to dial any phone number in Sao Tome and Principe from another country. This code is assigned by the International Telecommunication Union (ITU) under the E.164 standard. Below you will find everything you need to successfully place a call to Sao Tome and Principe, including the correct number format, trunk prefix, and worked examples.

Country Code

+239

ISO Code

Trunk Prefix

None

No prefix to remove

Example Number

+239 981 2345

How to Call Sao Tome and Principe from Abroad

Follow these steps to dial a phone number in Sao Tome and Principe from any other country. The process is the same whether you are calling a landline or a mobile number.

1
Dial the international access code or +
On a mobile phone, press and hold 0 to get the + symbol. From a landline, dial your country's exit code (00 from most of Europe, 011 from the US/Canada, 0011 from Australia). With Kinvo, simply type + in the dialer.
2
Dial Sao Tome and Principe's country code: 239
After the + or exit code, enter 239. This routes your call to Sao Tome and Principe's telephone network.
3
Dial the full local number
Sao Tome and Principe does not use a trunk prefix, so dial the local number exactly as written after the country code. No digits need to be removed.
4
Dial the remaining local number
Enter the area code (if applicable) and the subscriber number. The complete international number should look like this: +239 981 2345

Sao Tome and Principe Phone Number Format

Landline Numbers

Landline numbers in Sao Tome and Principe typically include an area code that identifies the city or region, followed by the subscriber number.

Mobile Numbers

Mobile phone numbers in Sao Tome and Principe typically begin with 9 (after the country code).

International Format Example

+239 981 2345

+239 = Country codeRemaining digits = Area code + subscriber number

Dialing Example: Calling Sao Tome and Principe

Sao Tome and Principe does not use a trunk prefix, so the domestic and international formats are very similar. Simply add +239 before the local number:

Local number:981 2345

International format:+239 981 2345

Call Sao Tome and Principe from Your Browser

With Kinvo, you can call landlines and mobiles in Sao Tome and Principe directly from Chrome, Firefox, Safari, or Edge. No app to install, no subscription. Just sign up, add pay-as-you-go credits (starting from $5), and dial +239 followed by the local number.

Every new account includes a free 1-minute test call. No credit card required.

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Frequently Asked Questions: Sao Tome and Principe Country Code

What is the country code for Sao Tome and Principe?

The international dialing code for Sao Tome and Principe is +239. This code must be dialed before the local phone number when calling Sao Tome and Principe from any other country. The ISO 3166-1 alpha-2 code for Sao Tome and Principe is ST.

How do I call Sao Tome and Principe from the United States?

From the US, dial 011 (the US exit code) followed by 239 (the Sao Tome and Principe country code) and then the local number. Alternatively, dial +239 from a mobile phone. For example: +239 981 2345.

Do I need to drop the 0 when calling Sao Tome and Principe internationally?

Sao Tome and Principe does not use a trunk prefix that needs to be removed. Simply add the country code +239 before the local number as-is.

What do Sao Tome and Principe mobile numbers start with?

Mobile phone numbers in Sao Tome and Principe typically start with 9 after the country code +239. When dialing from abroad, the full mobile number would begin with +239 9...

Can I call Sao Tome and Principe from my browser?

Yes. Kinvo allows you to call any phone number in Sao Tome and Principe directly from your web browser using WebRTC technology. No app download or installation is required. Simply create a free account, add credits (from $5), and dial +239 followed by the local number. Calls include HD voice quality and end-to-end encryption.