How to Call Mexico From the US: Exact Steps
To call Mexico from the US, dial 011, then 52, then the 10-digit Mexican number — for example 011 52 55 1234 5678. From a cell phone you can replace 011 with +. Landlines and mobiles dial identically; Mexico’s old 044, 045, and “1” mobile prefixes were eliminated in 2019 and will break your call if you still use them.
That one sentence answers most searches, but the failure modes are worth five minutes: a huge share of instructions still circulating online predate Mexico’s numbering reform, and following them produces fast-busy signals and “number does not exist” recordings. Here is the sequence step by step, two worked examples, and the exact mistakes to avoid.
Step by step: 011 + 52 + 10 digits
Every call to Mexico from a US phone is the same four-part sequence:
- Dial 011 — the exit code that tells a US (NANP) network the call is international. On a mobile, press and hold 0 to get + instead; the network converts it to the exit code automatically.
- Dial 52 — Mexico’s country code. Our country code 52 guide covers what it is and how Mexican numbers are structured.
- Dial the 10-digit Mexican number — area code plus subscriber number, exactly as a caller inside Mexico would dial it.
- Do not add anything else. No 01, no 044 or 045, no extra 1. Ten digits after the 52, full stop.
The complete string is 12 digits after the country code indicator — comfortably inside the 15-digit ceiling that E.164, the international numbering format, allows. Stored in a contact list, the same number should read +52 followed by ten digits.
Two worked examples
A Mexico City landline. Mexico City uses the two-digit area code 55, so a local number looks like 55 1234 5678. From the US you dial:
011 52 55 1234 5678 (or +52 55 1234 5678 from a cell)
A Guadalajara mobile. Guadalajara’s area code is 33, so a mobile there looks like 33 9876 5432. From the US you dial:
011 52 33 9876 5432 (or +52 33 9876 5432 from a cell)
Notice the two examples are structurally identical. That is the post-2019 rule doing its work: since Mexico’s numbering reform in August 2019, mobiles and landlines share one uniform 10-digit format and dial exactly the same way, from inside Mexico and from abroad. The big-city two-digit area codes are 55 and 56 (Mexico City), 33 (Guadalajara), and 81 (Monterrey); everywhere else uses three-digit area codes, still totaling 10 digits.
The mistakes that break calls to Mexico
Most failed US-to-Mexico calls trace back to instructions written before August 2019. Mexico’s regulator eliminated its old dialing prefixes in that reform, so these patterns now fail or misroute:
- Dialing 011 52 1 before a mobile. For years, Mexican cell phones required a “1” after the country code. The reform abolished it. Some routes still tolerate the stale digit, many reject it — delete the 1 from saved contacts and lead lists.
- Including 044 or 045. These were Mexico’s domestic mobile prefixes (local and long-distance respectively). They were eliminated in 2019 and were never dialed from the US in the first place. A number pasted from an old Mexican source may carry them — strip them.
- Keeping the 01. Mexico’s old domestic long-distance prefix, also retired in 2019. Like a UK number’s leading 0, it never belongs after a country code.
- Doubling the country code. Dialing 011 52 against a contact already saved as +52 55 1234 5678 sends 52 twice and fails. Save contacts in +52 format and let the phone handle the rest.
- Dialing only 10 digits. With no 011 or +, a US network reads the first digits as a NANP area code and connects you to a very confused stranger in the States.
The symptom for nearly all of these is a fast-busy tone, a carrier intercept message, or a wrong number. The fix is always the same: reduce the number to exactly ten digits, then put 011 52 (or +52) in front.
Cell plan, calling card, or VoIP: what changes
The dial string above works from any US phone. What differs is what the call costs and how it is treated — and per-minute costs vary widely by route, carrier, and plan, so be skeptical of any table of universal rates.
Cell plans. Many US mobile plans now include Mexico calling or offer it as a cheap add-on, reflecting how much cross-border traffic exists. Check your plan before assuming international rates apply — and before buying anything else.
Calling cards. The legacy option. They work, but the advertised rate often hides connection fees, rounding rules, and expiring balances. Read the fine print on billing increments before loading money onto one.
VoIP. Internet calling turns a Mexico call into data plus carrier termination, which is why VoIP is usually the economical path for anyone calling Mexico regularly — and the only sane path at business volume. SIPNEX keeps no A-Z rate deck on the shelf — ask us for a quote on the routes you actually run; we only price what we can stand behind.
Texting Mexico from a US number
SMS to Mexico uses the same number you would dial, in + format: +52 followed by the 10-digit number, no exit code, no extra 1. If a message fails, check the saved contact for a stale “1” after the 52 — old address-book entries and some messaging apps preserved the pre-2019 mobile format long after the phone network dropped it. Ordinary international SMS rates or plan allowances apply; over-the-top apps like WhatsApp ride your data instead of SMS entirely.
Calling Mexico at business volume
One person dialing 011 occasionally needs nothing more than this article. A sales floor, support desk, or logistics operation calling Mexico daily needs clean E.164 formatting on every record, routes that answer, and a carrier that will say out loud which destinations it stands behind.
SIPNEX is an FCC-licensed carrier — 499 filer, RespOrg, signing outbound calls with our own STIR/SHAKEN certificate. We deliver SIP trunking built for high-volume outbound and US DID numbers for your callback presence, and we quote international routes on request instead of hiding behind a rate deck. Browse the full country code list for other destinations, or call us at (833) 665-2220.
Frequently asked questions
What is the exit code to call Mexico from the US?
011 — the international exit code for the entire North American Numbering Plan. Dial 011, then Mexico’s country code 52, then the 10-digit number. On mobile phones the + symbol substitutes for 011 and works worldwide, which is why contacts are best saved in E.164 format (+52 plus ten digits).
Does calling Mexico count as international on a US cell plan?
Technically yes — but many US mobile plans now include Mexico calling outright or offer it as an inexpensive add-on, so it is often not billed at international rates. Check your plan’s Mexico treatment before dialing or buying a calling card; for regular or business-volume calling, VoIP is usually the more economical path.
Why do my calls to Mexico get a fast busy or an error message?
Usually a malformed dial string: a leftover 1 after the 52, an old 01/044/045 prefix pasted in with the number, a doubled country code, or a missing 011/+ entirely. Reduce the number to exactly ten digits, prepend 011 52, and redial. If a correctly formatted number still fails from a business phone system, the problem is the route, not the digits — ask your carrier.
How many digits does a Mexican phone number have?
Ten — uniformly, since the 2019 reform. Mexico City (55), Guadalajara (33), and Monterrey (81) use two-digit area codes with eight-digit subscriber numbers; everywhere else pairs three-digit area codes with seven-digit subscriber numbers. Details are in our country code 52 guide.
How do I text a Mexican number from a US phone?
Address the SMS to +52 followed by the ten-digit number — no 011, no extra 1. If an old WhatsApp or address-book entry shows +52 1, that is a pre-2019 artifact; the SMS network wants the number without the 1. Standard international messaging rates or your plan’s allowance apply.
SIPNEX is an FCC-licensed carrier providing high-volume SIP trunking, US DID numbers, and toll-free service as a registered RespOrg — every outbound call signed with our own STIR/SHAKEN certificate. International routes quoted on request: (833) 665-2220, or ask an operator.
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