🇲🇽 Mexico Phone Number Format

Mexican phone numbers are 10 digits with no trunk prefix, following a 2019 regulatory reform that eliminated the old "01" long-distance prefix and "044/045" mobile access codes. Mexico City numbers use area code 55, Guadalajara 33, Monterrey 81 — and the same 10-digit national number follows +52 unchanged in international format.

A Mexican Number in All Four Formats

Here is how one Mexico number is written in each of the four standards:

FormatExampleUse for
E.164 +525512345678 Databases, SMS APIs (Twilio, WhatsApp), CRMs
International +52 55 1234 5678 Display to a global audience, business cards
National 55 1234 5678 Domestic display inside Mexico
RFC3966 tel:+52-55-1234-5678 Clickable tel: links on websites

The 2019 Reform: One Number, One Format, Nationwide

Before August 2019, dialing in Mexico was a maze: "01" for long-distance domestic calls, "044" or "045" to reach mobiles, and a floating "1" that appeared in E.164 mobile numbers (+521XXXXXXXXXX) but not landlines (+52XXXXXXXXXX). The Instituto Federal de Telecomunicaciones (IFT) eliminated all of these with a single rule: every Mexican number is 10 digits, dialled the same way from anywhere in the country. No prefixes, no distinction between mobile and landline routing.

The area code system mirrors the NANP in concept: bigger cities get shorter codes. Mexico City and its metropolitan area share 55, giving eight digits of subscriber space. Guadalajara uses 33, Monterrey 81, Tijuana 664, Cancún 998. Smaller cities use three-digit codes (e.g. 777 Cuernavaca, 871 Torreón), leaving seven digits for the subscriber. The total is always 10.

The 2019 reform also fixed the long-standing E.164 inconsistency. Legacy databases may still contain 11-digit Mexican mobile entries in the old +521XXXXXXXXXX format — that extra "1" after the country code is now obsolete and should be removed. Current E.164 for all Mexican numbers is simply +52 followed by the 10-digit number.

Two-Digit City Codes and the 10-Digit National Plan

TypePrefixesDigitsExample
Mexico City (mobile & landline) 55 10 55 1234 5678
Guadalajara 33 10 33 1234 5678
Monterrey 81 10 81 1234 5678
Other cities (3-digit code) 222, 477, 664, 998… 10 664 123 4567
Toll-free 800 10 800 123 4567

Calling Mexico: No Prefix, Just 10 Digits

Calling fromDial
Within Mexico 55 1234 5678 — Since 2019 — no prefix, just 10 digits.
From the US 011 52 55 1234 5678
From any mobile +52 55 1234 5678
  1. Enter + or your country's international exit code.
  2. Add the Mexican country code 52.
  3. Dial the 10-digit number directly — there is no leading digit to drop.

Mexican Numbering After the 2019 Reform

  • Since August 2019, Mexico uses 10-digit dialing nationwide with no "01" long-distance prefix or "044/045" mobile prefix.
  • Old E.164 mobile records stored as +521XXXXXXXXXX (11 digits) are obsolete — remove the extra "1" to get the correct +52XXXXXXXXXX.
  • Mexico City area code 55 is two digits; many regional cities use three-digit codes (664, 998, 222), always totalling 10 digits.
  • There is no trunk prefix — the 10 national digits follow +52 unchanged in international format.

Mexican Area Codes by City

Area codeRegion
55 Mexico City (CDMX) & metro area
33 Guadalajara
81 Monterrey
664 Tijuana
998 Cancún
222 Puebla
477 León
871 Torreón

Format a Mexican Number Instantly

Enter any Mexican number — bare digits, old +521 format, or with area code — and get the correct +52 E.164 for SMS APIs and CRMs.

Enter phone number with country code or select country below.

Try:

Mexico Phone Format FAQ

How do I write a Mexican phone number in international format?

Add +52 in front of the 10-digit number with no changes: 55 1234 5678 becomes +52 55 1234 5678, or +525512345678 in strict E.164. Since 2019 there is no trunk prefix to drop.

Why does my old Mexican mobile number have 11 digits in E.164?

Before August 2019, Mexican mobile E.164 numbers included an extra "1" after the country code (+521XXXXXXXXXX). The IFT 2019 reform eliminated this. Remove the "1" to get the current correct form: +52XXXXXXXXXX (10 digits after +52).

Does Mexico have a trunk prefix like the UK or Australia?

No. Mexico abolished its trunk prefixes in 2019. The 10-digit national number is the same domestically and after +52 internationally — no digit is added or removed.

What is the area code for Mexico City?

Mexico City's area code is 55. A full Mexico City number is 10 digits: 55 followed by an 8-digit subscriber number, e.g. 55 1234 5678. In E.164: +525512345678.

How do I call Mexico from the United States?

Dial 011 52 followed by the 10-digit Mexican number: 011 52 55 1234 5678. From a mobile, +52 55 1234 5678 works directly.

Other Country Formats