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Latin America · +54

Argentina phone number format

  • Country code +54
  • Trunk prefix 0

Reviewed by Sujan ThapaliyaLast updated

What does a Argentina phone number look like?

10 digits after the area code rules are applied. Landlines are written +54 XX XXXX XXXX and mobiles +54 9 XX XXXX XXXX. In full international (E.164) format a Argentina mobile is written +5491143211234: the country code +54, with the national trunk prefix 0 removed, and no spaces or punctuation.
The anatomy of a Argentina phone number under ITU-T E.164: country calling code 54, then the national destination code, then the subscriber number, to a maximum of fifteen digits after the plus. Nationally a Argentina number is written +54 XX XXXX 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 Argentina numbers in the right-hand form.

Format rules

Country code
+54
National number length
10 digits after the area code rules are applied
Trunk prefix
0
Used only domestically. Removed in international format.
Landline pattern
+54 XX XXXX XXXX
Mobile pattern
+54 9 XX XXXX XXXX

Examples

Argentina 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)
Landline011 4321 1234+541143211234
Mobile09 XX XXXX XXXX+5491143211234

A quirk of Argentina numbering

To reach an Argentine mobile from abroad you insert a 9 after +54 and drop the domestic 15 prefix. Getting this wrong is the single most common reason calls to Argentina fail.

Validation

How to validate a Argentina 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 Argentina? 10 digits after the area code rules are applied, 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 (+5491143211234) 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 Argentina’s format rules. No sign-up.

Frequently asked questions

What does a Argentina phone number look like?
10 digits after the area code rules are applied. A landline is written +54 XX XXXX XXXX and a mobile +54 9 XX XXXX XXXX. In full international format that becomes +5491143211234.
How do I write a Argentina number in international format?
Start with +54, remove the leading 0 from the national number, then append the rest with no spaces or punctuation. +54 11 4321 1234 becomes +541143211234.
How many digits is a Argentina phone number?
10 digits after the area code rules are applied.
How do I tell a Argentina mobile from a landline?
By the prefix. Mobiles follow the pattern +54 9 XX XXXX XXXX, while landlines follow +54 XX XXXX 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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