+32, +352, +975 — How to Look Up an Unknown Country Code and Call Back From Your Browser

I make and receive a lot of international calls, both for work and personally. A customer of mine living abroad — I will call her Patricia — recently sent me this:

"I got a call from +32 the other day. I searched and found out it was Belgium, but then I got stuck on how to actually call back. I ended up using my mobile's international calling, and it cost me. Is there a smarter way to do this?"

Patricia's situation is common. An unknown country code shows up on your phone. You figure out which country it is. But then the trail ends. The lookup site tells you the country, but not how to dial it, and certainly not how to do it cheaply. It is like being shown a map but not being told the road.

This post covers the full flow: look up the country, build the right dial string, and call back straight from your browser.

The Full Flow

The ideal sequence is simple: lookup, dial string, call. Three steps, one continuous motion.

1. Look up the country code.
2. Build the correct dial string.
3. Call from your browser.

This post focuses on steps 2 and 3. But before any of that, there is step 0: make sure it is safe to call back.

Check Before You Call Back

An unknown international number is not always benign. There is a scam called "wangiri" (one-ring scam) where a call from an overseas number rings once and hangs up, leaving a missed-call notice. The goal is to get you to call back. When you do, you are connected to a premium-rate international line, and part of that charge goes to the scam operator.

In Japan, where I am based, police data shows that roughly 75% of phone numbers used in special fraud cases are international numbers. An unexpected overseas call deserves caution.

How to Check If It Is Safe to Call Back

Before you return a call to an unknown country code, run through this checklist.

• Do you know anyone there?

Check whether you have family, friends, or business contacts in that country. If there is no connection, there is probably no reason to call back.

• Was a voicemail left?

A genuine caller with something important to say will leave a message or call again. A missed call with no message and no repeat attempt is usually not worth returning.

• Search the number online

Look up the full number on Google or Whoscall. If multiple reports flag it as spam or fraud, do not call back.

• Use a browser calling service

If you genuinely need to return the call, using a browser-based service rather than your mobile carrier reduces both cost and risk. With PuchiDen, the call goes over the internet, so your carrier's international rates do not apply. Your caller ID also shows as a PuchiDen number, not your personal one, which makes it harder for scam operators to mark your number as "active." That said, browser calling does not change who is on the other end. If you have no reason to trust the number, the safest choice is still not to call back.

Signs a Call Is Likely a Scam

Do not return the call if any of these apply:

• It rang once and stopped.
• No voicemail or message was left.
• The country is one you have no connection to.
• An automated voice claims your service will be suspended or a fee is unpaid.
• You are prompted to "press 1" or follow further instructions.

International Dialing Is Just Three Parts

An international dial string has three blocks. Once you know them, assembly is mechanical.

1. International prefix (from Japan, "010" or "+")

When dialing from Japan to another country, you start with "010" as the international access code. On a smartphone, long-pressing "0" gives you "+", which serves the same purpose.

2. Country code (Belgium is 32, the UK is 44, the US is 1)

These are 1- to 3-digit codes assigned by the ITU to each country. According to au's country code list, Belgium is 32, the UK is 44, and the United States is 1.

3. The local number, with the leading "0" removed

This is the part most people miss. In many countries, domestic phone numbers start with a "0" that acts as a trunk prefix. That "0" is only for domestic calls. For international calls, you drop it.

For example, a Belgian landline number might be listed as "02-123-4567." From Japan, you dial 010-32-2-123-4567. The leading "0" is gone.

NTT Docomo's international calling guide states this explicitly: "If the other party's phone number begins with 0, omit the first 0 when entering it."

Country Codes and PuchiDen Rates

After you look up a country code, the next question is cost. Here are PuchiDen's rates for a few representative countries (as of September 2026):

Country	Country Code	Landline	Mobile
Belgium	+32	0.08 EUR/min	0.77 EUR/min
Luxembourg	+352	0.39 EUR/min	0.45 EUR/min
United Kingdom	+44	0.03 EUR/min	0.05 EUR/min
United States	+1	0.02 EUR/min	0.02 EUR/min
Bhutan	+975	0.26 EUR/min	0.26 EUR/min
Japan	+81	0.10 EUR/min	0.24 EUR/min

Belgium landline is about 14 yen per minute. The UK is about 5 yen. Japan landline is about 17 yen. All are pay-as-you-go with no connection fee.

When Browser Calling Makes Sense

Patricia's case is one of several where calling from a browser is the better option.

Calling back a bank's fraud alert line

When you live abroad, a Japanese bank may call you from a +81 number to verify suspicious card activity. Calling back through your browser lets you use your regular caller ID setup and avoids your local SIM's international rates.

Reaching an embassy or consulate

Before travel, you may need to confirm visa or entry requirements with an embassy by phone. Look up the country code, and dial straight from your browser.

Handling airline rebooking

Flight changes and cancellations often require a phone call. Dialing from a browser keeps both the wait time and the cost down.

Common Mistakes

Three errors show up repeatedly between lookup and dial.

1. Forgetting the international prefix

"32-2-123-4567" without 010 or + at the front is not an international call. The prefix is mandatory.

2. Keeping the leading "0"

"010-32-02-123-4567" will fail. The "0" after the country code must be removed.

3. Swapping country code and area code

Belgium's area code "02" and country code "32" are easy to mix up. The country code always comes first, before any local digits.

How Browser Calling Works

You can dial a real phone number from a web page because of a technology called WebRTC. It is an open standard that lets browsers handle real-time voice and video without plugins. The W3C WebRTC specification defines it as "plugin-free" by design. Chrome, Firefox, Safari, and Edge all support it natively.

The path from your browser to a ringing phone looks like this:

1. Your browser captures audio from your microphone via WebRTC.
2. That audio travels to a gateway that bridges the internet to the public phone network.
3. The gateway places a standard phone call to the number you entered.

Steps 2 and 3 are invisible. From your side, you typed a number, pressed call, and a phone rang somewhere in the world. That is exactly how it should work.

Walkthrough: Belgium, Step by Step

Here is what calling +32 looks like in practice.

Step 1: Confirm the country code

ITU numbering assigns 32 to Belgium.

Step 2: Build the dial string

• International prefix: 010
• Country code: 32
• Local number: 02-123-4567 → 2-123-4567 (drop the leading 0)
• Result: 010-32-2-123-4567

Step 3: Open your browser and call

Go to PuchiDen, log in, enter the number, and press call. The other person's phone rings normally. They do not need an app or an account.

Why This Matters If You Live Abroad

For someone like Patricia, browser calling solves problems that app-based services do not address.

Your local SIM may not handle international calls well

A newly purchased local SIM abroad often has no affordable way to dial back to Japan or Europe. A browser and Wi-Fi are enough.

Chromebooks and locked-down devices

Chromebooks and corporate laptops with restricted app stores cannot install Skype or similar apps. A browser works on all of them.

One call, no subscription

If you only need to make a single call, a pay-as-you-go service with no monthly fee is the right fit. PuchiDen includes free starter credit (about EUR 0.60), which is enough to test one call without entering payment details.

So, To Wrap It Up

The whole process is: look it up, build the string, call from the browser.

Looking up a country code and placing the call do not need to be separate tasks. If the lookup page you are already on had a dial pad, Patricia's problem would not have existed in the first place.

When an unknown country code appears, pause. Look it up. Check whether it is safe. Build the correct dial string. Then open your browser and call. That is all there is to it.

Call that number now from your browser with PuchiDen

Signing up takes an email address. No credit card is required. Use the free starter credit to test a call to that unknown country code before you commit.