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Asia · +65

Singapore phone number format

  • Country code +65
  • No trunk prefix

Reviewed by Sujan ThapaliyaLast updated

What does a Singapore phone number look like?

8 digits, always. No area codes. Landlines are written +65 6XXX XXXX and mobiles +65 [89]XXX XXXX. In full international (E.164) format a Singapore mobile is written +6591234567: the country code +65, and no spaces or punctuation.
The anatomy of a Singapore phone number under ITU-T E.164: country calling code 65, then the national destination code, then the subscriber number, to a maximum of fifteen digits after the plus. Nationally a Singapore number is written +65 6XXX XXXX; 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 Singapore numbers in the right-hand form.

Format rules

Country code
+65
National number length
8 digits, always. No area codes
Trunk prefix
None
The local number is already the international number.
Landline pattern
+65 6XXX XXXX
Mobile pattern
+65 [89]XXX XXXX

Examples

Singapore 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)
Landline6123 4567+6561234567
Mobile[89]XXX XXXX+6591234567

A quirk of Singapore numbering

Singapore has no area codes: 6 means landline, 8 or 9 means mobile, 3 means VoIP.

Validation

How to validate a Singapore 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 Singapore? 8 digits, always. No area codes, after the country code .
  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 (+6591234567) 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 Singapore’s format rules. No sign-up.

Frequently asked questions

What does a Singapore phone number look like?
8 digits, always. No area codes. A landline is written +65 6XXX XXXX and a mobile +65 [89]XXX XXXX. In full international format that becomes +6591234567.
How do I write a Singapore number in international format?
Start with +65, then append the rest with no spaces or punctuation. +65 6123 4567 becomes +6561234567.
How many digits is a Singapore phone number?
8 digits, always. No area codes.
How do I tell a Singapore mobile from a landline?
By the prefix. Mobiles follow the pattern +65 [89]XXX XXXX, while landlines follow +65 6XXX 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.

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