Skip to content
AI Dialer

Europe · +358

Finland phone number format

  • Country code +358
  • Trunk prefix 0

Reviewed by Sujan ThapaliyaLast updated

What does a Finland phone number look like?

5 to 12 digits after the trunk 0. Landlines are written +358 X XXX XXXX and mobiles +358 4X XXX XXXX. In full international (E.164) format a Finland mobile is written +358401234567: the country code +358, with the national trunk prefix 0 removed, and no spaces or punctuation.
The anatomy of a Finland phone number under ITU-T E.164: country calling code 358, then the national destination code, then the subscriber number, to a maximum of fifteen digits after the plus. Nationally a Finland number is written +358 X XXX XXXX with the trunk prefix 0; in E.164 the prefix and the spacing both come off.
National formatting is for people. E.164 is for databases, APIs, and caller ID — store Finland numbers in the right-hand form.

Format rules

Country code
+358
National number length
5 to 12 digits after the trunk 0
Trunk prefix
0
Used only domestically. Removed in international format.
Landline pattern
+358 X XXX XXXX
Mobile pattern
+358 4X XXX XXXX

Examples

Finland phone number examples

These are format patterns showing digit grouping and prefix rules. They are examples of shape, not working numbers; do not use them to test a live call path.

TypeWritten domesticallyInternational (E.164)
Landline09 123 4567+35891234567
Mobile04X XXX XXXX+358401234567

Validation

How to validate a Finland number

Validating a phone number is three separate checks, and conflating them is the usual source of bugs:

  1. Format: does it match the shape for Finland? 5 to 12 digits after the trunk 0, after the country code and with the 0 stripped.
  2. Allocation: is the prefix actually in use? A number can be the right length and still belong to an unallocated range.
  3. Reachability: is there a live subscriber? Only a carrier lookup (HLR or equivalent) answers that, and it is the only check that catches disconnected numbers.

For form validation, check format only and be permissive: accept spaces, dashes, brackets, and a leading 0 then normalise. Rejecting a real customer because they typed their own number the way they normally write it is a far more expensive error than storing one badly formatted row.

Store in E.164 (+358401234567) and format for display at render time. Storing the display format is how a database ends up with the same person recorded four different ways.

Format any number instantly

Paste a number into the free phone number formatter to convert it to E.164 and see whether it matches Finland’s format rules. No sign-up.

Frequently asked questions

What does a Finland phone number look like?
5 to 12 digits after the trunk 0. A landline is written +358 X XXX XXXX and a mobile +358 4X XXX XXXX. In full international format that becomes +358401234567.
How do I write a Finland number in international format?
Start with +358, remove the leading 0 from the national number, then append the rest with no spaces or punctuation. +358 9 123 4567 becomes +35891234567.
How many digits is a Finland phone number?
5 to 12 digits after the trunk 0.
How do I tell a Finland mobile from a landline?
By the prefix. Mobiles follow the pattern +358 4X XXX XXXX, while landlines follow +358 X XXX XXXX.
Should I store phone numbers with the plus sign?
Yes. Store every number in E.164: leading +, country code, national number, no spaces or punctuation, up to 15 digits. It is the only format that is unambiguous internationally, and it is what makes deduplication work. Format for display, store canonical.

Sources

  1. ITU-T Recommendation E.164 — The international public telecommunication numbering plan — International Telecommunication UnionThe international number format, the 15-digit maximum, and how country codes and national numbers compose.
  2. ITU-T International Numbering Resources — International Telecommunication UnionThe assignment of country calling codes and the published national numbering plans they belong to.

Stop wrestling with number formats

Every number you import is validated and normalised to E.164 automatically, screened against your suppression lists, and formatted correctly for the country it belongs to before a single call goes out.

  • Automatic E.164 normalisation
  • DNC screening on import
  • 100+ countries
Get early accessTry the formatter