Netherlands Phone Codes: Complete Guide To Dialing Codes

Dialing phone numbers in the Netherlands requires understanding country codes, regional area prefixes, and proper formatting to avoid failed connections. Whether you're reaching out to a business in Amsterdam or calling family in Rotterdam, getting the digits right makes all the difference.

The Netherlands uses country code +31 for all incoming international calls. When calling from outside the country, you drop the leading zero from the domestic area code, whereas domestic callers always include it. Missing a digit or dialing the wrong exit code will result in an immediate connection failure or an incorrect destination.

Anatomy of Dutch Phone Numbers

Dutch phone numbers follow a standardized national numbering plan regulated by the Authority for Consumers and Markets. Understanding how these numbers are structured helps you diagnose dialing errors quickly.

Landline numbers across the Netherlands consist of a two-digit or three-digit area code followed by a seven-digit subscriber number. Mobile numbers start with dedicated prefixes rather than geographic regions, while toll-free and special services use entirely separate ranges.

• Geographic area codes: Two digits for major cities (like Amsterdam's 20) and three digits for smaller towns.
• Mobile prefixes: Always start with specific digits such as 6, followed by eight subscriber numbers.
• Subscriber numbers: Typically seven digits long for both landlines and mobile lines.
• Total length: Standard Dutch numbers contain ten digits total when dialed nationally with the leading zero.

Step-by-Step Dialing Instructions from Abroad

Placing a call to the Netherlands from another country requires combining your local international prefix, the Dutch country code, the regional area code without its zero, and the local subscriber number.

The process varies slightly depending on your origin country, but the destination structure remains identical.

Dialing from North America

North American callers must use the international exit code 011 before entering the rest of the sequence.

1. Dial your international exit code: 011.
2. Dial the Netherlands country code: 31.
3. Enter the local area code, dropping the initial 0. For example, Amsterdam's 020 becomes 20.
4. Enter the seven-digit subscriber number.
5. The complete sequence looks like: 011 31 20 123 4567.

Dialing from the United Kingdom and Europe

Callers located within Europe using GSM networks can often substitute the plus sign (+) for their local international exit code.

1. Dial the international access code (00 in Europe) or press and hold 0 to type +.
2. Dial the country code: 31.
3. Drop the leading zero from the Dutch area code and type the remaining digits.
4. Finish with the subscriber number.
5. Example sequence: +31 20 123 4567.

Major Dutch Area Codes

Landline telephone numbers in the Netherlands are tied to specific geographic regions. If you're trying to reach a physical office or residence, you need the correct local prefix.

Major cities and their corresponding two-digit area codes include:

• Amsterdam: 20
• Rotterdam: 10
• The Hague (Den Haag): 70
• Utrecht: 30
• Eindhoven: 40

Smaller municipalities utilize three-digit area codes. For example, Haarlem uses 23, Groningen uses 50, and Maastricht uses 43. Always check the specific city prefix before placing a landline call.

Mobile Phone and Special Service Numbers

Mobile numbers in the Netherlands do not correspond to geographic locations. Instead, they are routed through nationwide cellular networks.

All Dutch mobile numbers begin with the digit 6 after the country code. When dialed from abroad, a mobile number appears as +31 6 followed by eight digits.

Special service numbers follow distinct rules:

• Toll-free numbers: Usually begin with 0800. These are generally unreachable from outside the Netherlands unless specifically configured for international inbound routing by the organization.
• Shared-cost and business services: Typically begin with 0900 or 088. Like toll-free numbers, these are primarily designed for domestic callers and may fail when dialed internationally.
• Emergency services: Dial 112 when inside the Netherlands for police, fire, or medical assistance. This is the standard European emergency number.

Common Mistakes to Avoid

Even experienced travelers and business callers occasionally stumble over subtle formatting rules when dialing European numbers.

• Leaving the leading zero: The most frequent mistake is keeping the 0 at the start of the area code while also dialing the international country code. If you dial +31 020..., the call will fail. Drop that zero.
• Forgetting time zones: The Netherlands operates on Central European Time (CET), which is UTC+1, and observes Central European Summer Time (CEST, UTC+2) from the last Sunday in March to the last Sunday in October. Check the clock before making business calls.
• Assuming mobile numbers need area codes: Mobile numbers use a 6 prefix instead of a city code. Don't add Amsterdam's 20 prefix to a cellular number.
• Ignoring carrier restrictions: Some budget VoIP providers or restricted landline plans block international routing by default. Verify that your telecom provider permits outbound calls to European destinations.

Frequently Asked Questions

Why does my call to the Netherlands fail immediately?

Calls usually fail because the leading zero of the area code was left in place after the country code, or your carrier blocks international direct dialing. Verify that you dialed +31 followed directly by the area code without its initial zero.

Can I use WhatsApp or VoIP instead of standard international calling?

Yes. Internet-based communication apps like WhatsApp or Signal bypass traditional carrier routing entirely. When saving Dutch contacts for app-based calling, always store them in full international format starting with +31.

Do Dutch phone numbers ever change length?

The Netherlands uses a closed numbering plan managed by the Rijksdienst voor Ondernemend Nederland and telecom regulators. Subscriber numbers consistently maintain seven digits, while area codes remain strictly two or three digits, preventing length variations.

How do I know if a number is a landline or a mobile?

Check the digits immediately following the country code or leading zero. If the number starts with 6, it is a mobile phone. Any other two or three-digit prefix indicates a geographic landline location.