+31 is the country calling code for the Netherlands. A Dutch mobile number written locally as 06 12345678 becomes +31 6 12345678 in international format. Fonable is a browser-native, pay-as-you-go international calling service; enter the +31 number without the Dutch trunk prefix 0, then use the live number checker to confirm a callable rate.
International mobile format
+31
Mobile
06 12345678 -> +31 6 12345678
Landline
020 123 4567 -> +31 20 123 4567
Last updated: June 4, 2026
Enter a Dutch number in +31 international format. Fonable's live number checker tries to confirm a callable per-minute rate for that specific number. Checking does not require a login; placing a call requires you to sign in.
Enter a Dutch mobile number beginning +31 6 or a Dutch landline number beginning +31 and a geographic area code. The live checker will try to confirm a callable rate and exact per-minute price.
Country calling code
+31
Mobile format
+31 6 12345678
Landline format
+31 20 123 4567
Time zone
Europe/Amsterdam (+02:00)
Use the +31 country calling code, then the Dutch national number without its local trunk prefix 0. A local mobile prefix 06 becomes +31 6. A local Amsterdam landline prefix 020 becomes +31 20. The remaining digits stay the same.
Local mobile format
06 12345678
Local landline
020 123 4567
International mobile format
+31 6 12345678
International landline
+31 20 123 4567
The first 0 is the Dutch trunk prefix used for calls within the Netherlands. Remove it before adding the +31 country calling code: 06 12345678 becomes +31 6 12345678, while a local Amsterdam landline beginning 020 becomes +31 20.
The exact Fonable price depends on the full phone number, not only the +31 country calling code. Use the live number checker on this page to see whether Fonable can confirm a callable rate and the current per-minute price for that specific number.
Dutch landlines use geographic area codes. The local trunk prefix 0 is removed in international format, so Amsterdam 020 becomes +31 20, Rotterdam 010 becomes +31 10, and The Hague 070 becomes +31 70. The table also shows the current local time.
See the current time in your location and Netherlands to plan your call.
Your location
13:28:49
UTC (6/7/2026, 13:28:49 +00:00)
Netherlands
15:28:49
GMT+2 (6/7/2026, 15:28:49 +02:00)
| City or number type | Local prefix | Country calling code + destination prefix | Current time there |
|---|---|---|---|
Amsterdam Europe/Amsterdam | 020 | +31 20 | 15:28 GMT+2 |
Rotterdam Europe/Amsterdam | 010 | +31 10 | 15:28 GMT+2 |
The Hague Europe/Amsterdam | 070 | +31 70 | 15:28 GMT+2 |
Utrecht Europe/Amsterdam | 030 | +31 30 | 15:28 GMT+2 |
Eindhoven Europe/Amsterdam | 040 | +31 40 | 15:28 GMT+2 |
Groningen Europe/Amsterdam | 050 | +31 50 | 15:28 GMT+2 |
Haarlem Europe/Amsterdam | 023 | +31 23 | 15:28 GMT+2 |
Leiden Europe/Amsterdam | 071 | +31 71 | 15:28 GMT+2 |
Maastricht Europe/Amsterdam | 043 | +31 43 | 15:28 GMT+2 |
Dutch mobile Europe/Amsterdam | 06 | +31 6 | 15:28 GMT+2 |
For a business call, use the recipient's published office hours when possible. Dutch offices often operate around 09:00-17:00 local time, but hours vary by organization, day, and public holiday. Check the current Netherlands time above before calling.
This guide uses the ITU-T E.164 assigned country-code list for +31, Dutch public guidance on phone-number types, and explicit Dutch mobile, landline, and area-code examples. Static examples explain number format; they do not promise that Fonable can call a particular number.
For an exact Fonable price, use the live number checker. Its result is the authority for whether Fonable can confirm a callable rate for the full number. For callback safety, remember that a displayed +31 number can be spoofed and verify unknown callers through a separately trusted source.
Direct answers about +31, 0031, Dutch mobile and landline formats, callable rates, browser calling, and spoofing-safe callbacks.
+31 is the country calling code for the Netherlands. The ITU assigns 31 to the Netherlands in the E.164 country-code list. A number beginning with +31 should then contain the Dutch national number without its local trunk prefix 0, such as +31 6 for a mobile number.
Enter the number in international format: +31, the Dutch mobile prefix 6, and the remaining eight digits. For example, 06 12345678 becomes +31 6 12345678. Do not include the local trunk prefix 0. Use Fonable's live number checker to confirm a callable rate before signing in to call.
The leading 0 is the Dutch trunk prefix used when a number is dialed within the Netherlands. Remove that 0 when you add the +31 country calling code. Keep the rest of the mobile or landline prefix, so 06 becomes +31 6 and 020 becomes +31 20.
+31 6 normally starts a Dutch mobile number. +31 is the Netherlands country calling code, while 6 is the mobile prefix after the local trunk prefix 0 has been removed from 06. It is not a separate country calling code, and the full number still needs eight digits after the 6.
Fonable is a browser-native, pay-as-you-go international calling service. Enter a Netherlands mobile number in international format, such as +31 6 12345678, and use the live number checker to see whether Fonable can confirm a callable rate. Checking requires no login; placing the call requires you to sign in.
The exact Fonable price depends on the full Dutch number, not only the +31 country calling code. Enter the number in the live number checker on this page. If Fonable can confirm a callable rate, the checker shows the current per-minute price before you sign in and place the call.
Amsterdam, Rotterdam, and The Hague use the Europe/Amsterdam time zone: Central European Time in winter and Central European Summer Time in summer. For a business call, aim for the recipient's published office hours, often around 09:00-17:00 local time, and check the current Netherlands time shown on this page.
A +31 caller ID does not prove that the call came from the Netherlands because caller ID can be spoofed. If you do not recognize the caller, do not rely on the displayed number alone. Verify the person or organization through a trusted channel before returning the call.
0031 and +31 both lead into the Netherlands country calling code when the calling service supports 00 as the international access prefix. The 00 is not part of the Dutch country calling code; the code itself is 31. In Fonable, enter the number with +31, not 0031.
For an Amsterdam landline, remove the local trunk prefix 0 from area code 020, then use +31 20 followed by the subscriber number. A local number such as 020 123 4567 becomes +31 20 123 4567. Other Dutch landlines follow the same rule with their own geographic area code.
A Dutch mobile number is normally written locally as 06 followed by eight digits, for ten digits in national format. In international format, remove the trunk prefix 0 and use +31 6 followed by those same eight digits. The +31 does not count as part of the Dutch national number.
Fonable lets you check a Dutch number and place an outbound international call from a browser without a SIM or mobile app. Enter the number in international format, use the live checker to confirm a callable rate, then sign in to call. Checking the number itself does not require a login.
00312 is not a separate country code. The 00 is an international access prefix, 31 is the Netherlands country calling code, and 2 begins a Dutch destination prefix. For example, an Amsterdam landline can be written as 0031 20 followed by the subscriber number when the calling service supports 00.
Before calling back, check whether you recognize the caller and whether the full number matches a contact or an official website. A familiar Dutch prefix does not prove the caller's identity because caller ID can be spoofed. When in doubt, use a separately verified number instead of returning the missed call.
Check a specific number's live callable rate, look up another country calling code, or open the browser dialer after you have confirmed the number.
A +31 caller ID does not prove that the call came from the Netherlands because caller ID can be spoofed. If you do not recognize the caller, verify the person or organization through a trusted channel and use a separately sourced number instead of relying only on the missed-call display.
Enter a Dutch number such as +31 6 12345678 in the live number checker. Checking requires no login. If Fonable confirms a callable rate, sign in to place the outbound international call from your browser.