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Trinidad and Tobago phone number format

  • Country code +1
  • No trunk prefix

Reviewed by Sujan ThapaliyaLast updated

What does a Trinidad and Tobago phone number look like?

10 digits: area code 868 plus 7 digits. Landlines are written +1 (868) NXX-XXXX and mobiles +1 (868) NXX-XXXX. In full international (E.164) format a Trinidad and Tobago mobile is written +18685550173: the country code +1, and no spaces or punctuation.
The anatomy of a Trinidad and Tobago phone number under ITU-T E.164: country calling code 1, then the national destination code, then the subscriber number, to a maximum of fifteen digits after the plus. Nationally a Trinidad and Tobago number is written +1 (868) NXX-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 Trinidad and Tobago numbers in the right-hand form.

Format rules

Country code
+1
National number length
10 digits: area code 868 plus 7 digits
Trunk prefix
None
The local number is already the international number.
Landline pattern
+1 (868) NXX-XXXX
Mobile pattern
+1 (868) NXX-XXXX

Examples

Trinidad and Tobago phone number examples

555-01XX is reserved across the North American Numbering Plan.

TypeWritten domesticallyInternational (E.164)
Landline(868) 555-0129+18685550129
Mobile(868) NXX-XXXX+18685550173

Validation

How to validate a Trinidad and Tobago 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 Trinidad and Tobago? 10 digits: area code 868 plus 7 digits, 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 (+18685550173) 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 Trinidad and Tobago’s format rules. No sign-up.

Frequently asked questions

What does a Trinidad and Tobago phone number look like?
10 digits: area code 868 plus 7 digits. A landline is written +1 (868) NXX-XXXX and a mobile +1 (868) NXX-XXXX. In full international format that becomes +18685550173.
How do I write a Trinidad and Tobago number in international format?
Start with +1, then append the rest with no spaces or punctuation. +1 (868) 555-0129 becomes +18685550129.
How many digits is a Trinidad and Tobago phone number?
10 digits: area code 868 plus 7 digits.
How do I tell a Trinidad and Tobago mobile from a landline?
You cannot tell from the number alone in Trinidad and Tobago: mobile and fixed lines share the same format, so a carrier lookup is the only reliable way.
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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