IDD Calling Codes From Singapore - International Dialling Guide

IDD codes are what allow you to dial internationally from Singapore to any destination in the world. Different countries have different codes—and depending on your telecom provider, you'll also need the right IDD prefix.

Providers like Circles.Life, Singtel, StarHub, M1, and Zero1 all support international calling. If you’re looking for affordable, no-fuss connectivity, Circles.Life offers one of the most budget-friendly options with easy-to-use IDD codes and flexible roaming plans.

What is an IDD Call?

An IDD (International Direct Dialing) call is a phone call made from one country to another without operator assistance. It allows users to directly dial international numbers using their local phone service. To make an IDD call, you typically need to enter the IDD prefix (like + or 001), followed by the country code, area code, and the recipient’s number.

IDD calls are often charged separately from local calls and may not be included in typical SIM-only plan packages unless stated.

What Are International Country Codes?

International country codes are numerical prefixes used to route phone calls to specific countries around the world. Each country has its own unique code , for example, Singapore is +65, the United States is +1, and Australia is +61.

When making an international call, you’ll need to dial the correct country code before the local number. These codes help telecom networks know where to send your call.

What is an IDD Code?

An IDD code (International Direct Dialing) is a numeric prefix that enables international calls from one country to another without operator assistance.

How IDD Works in Singapore

To call a number overseas from Singapore, the format you’ll need is:

IDD Prefix + Country Code + Area Code + Local Number

Example: 003 61 2 9876 5432

(This dials Sydney, Australia using Circles.Life's prefix 003)

Common IDD Prefixes in Singapore

Tip: Most smartphones accept the “+” symbol in place of the IDD prefix for convenience—but it’s always good to know your provider’s actual code for billing clarity and compatibility.

Example Dialing Format

IDD Code + Country Code + Area Code + Local Number

Just remember to remove any leading zeroes from area/mobile codes when dialing internationally.

How to Make an IDD Call from Singapore

To make an IDD call from Singapore, follow these steps:

1. Dial the IDD prefix – For most mobile networks in Singapore, use + or 001 as the international access code.

2. Enter the country code – For example, 1 for the USA, 44 for the UK, or 63 for the Philippines.

3. Add the area code (if needed) – This depends on the country and the city or region you're calling.

4. Dial the local phone number – Complete the sequence by entering the recipient’s number.

Example: To call a number in Los Angeles, USA (area code 213), you would dial:

+1 213 XXX XXXX or 001 1 213 XXX XXXX

Circles.Life users should also check if their plan includes IDD minutes or if it’s billed separately.

IDD vs ICC – What's the Difference?

List of IDD Calling Codes from Singapore

Country-Wise Table

✳ Replace XXXXXXXXX with the actual number you're calling.

Circles.Life eSIM Plans for International Travelers

Note:

• Both plans allow usage in Singapore and 7 popular countries.

• No SIM swap required – easy travel access with eSIM.

• CirclesAI is powered by OpenAI’s latest models.

How to Make an International Call from Singapore

Step 1: Dial the IDD Prefix

Start by dialing + or 001, 002, or 008, depending on your telco provider.

• Example: If you're using Singtel, you can dial 001.

Step 2: Enter the Country Code

This is the numerical code assigned to each country.

• Example: To call the United States, dial 1.

• So far, your number looks like this: 001 1

Step 3: Add the Area Code (if required)

Some countries use area or city codes for landlines. Mobile numbers may not need this.

• Example: To call New York City, add area code 212.

• Your number is now: 001 1 212

Step 4: Dial the Local Phone Number

Finish by dialing the person’s actual phone number.

• Example: If their number is 555-1234, the full dial string will be:

  001 1 212 5551234

How to Save on International Calls from Singapore

International calls don’t have to be expensive. Here are some smart ways to keep costs low:

1. Use Budget IDD Services

Opt for providers like Circles.Life (003) or Singtel 018 that offer cost-effective international rates without hidden charges.

2. Leverage VoIP Services

Use WhatsApp, Skype, Zoom, or Google Meet to make voice or video calls over the internet, often free or at minimal data cost.

3. Check Promotions from Telecom Providers

Many providers offer limited-time international calling deals, roaming bundles, or promo packs—especially during holidays.

4. Use Prepaid International Calling Cards

These offer fixed rates and are great if you want to control your calling budget in advance.

​​Country-Specific International Calling Guides

Need help calling a specific country from Singapore? Check out our detailed guides below:

🇭🇰 How to Call Hong Kong from Singapore

🇨🇳 How to Call China from Singapore

🇺🇸 How to Call the USA from Singapore🇮🇩 How to Call Indonesia from Singapore

🇮🇳 How to Call India from Singapore🇵🇭 How to Call the Philippines from Singapore

🇦🇺 How to Call Australia from Singapore

🇲🇾 How to Call Malaysia from Singapore

These articles include step-by-step instructions, country codes, IDD prefixes, and useful tips for a smooth international call.

Frequently Asked Questions (FAQs)

1. What is the cheapest IDD service from Singapore?

Providers like Circles.Life (003) and Singtel’s 018 are often considered the most affordable. Always check the latest rates and bundles offered.

2. Can I use IDD codes from mobile phones in Singapore?

Yes! Mobile phones accept both IDD prefixes (e.g. 003) and the “+” symbol, which automatically detects the correct prefix based on your provider.

3. Are there alternatives to IDD calls?

Absolutely. You can use VoIP apps like WhatsApp, Viber, Skype, FaceTime, and Zoom for audio/video calls over Wi-Fi or data.

4. Can I use IDD on a prepaid SIM?

Yes. Most prepaid SIMs in Singapore allow IDD calls, but rates may vary. Ensure your prepaid balance is sufficient and IDD is enabled in your account settings.

5. How do I check Circles.Life’s IDD rates?

You can view updated IDD rates directly through the Circles.Life app or their official website. Just search for “IDD rates” or visit the support section.

6. Why are there different IDD prefixes in Singapore?

Each prefix represents a different telecom provider’s international gateway. For example, 001 is for Singtel, 008 for StarHub, and 003 for Circles.Life. Choosing a different prefix can impact your call quality and rate.