Mexico enforces SIM registration as the August 31 deadline arrives

Updated August 31, 2026. Mexico's staggered registration program is now being enforced. The deadline for unlinked prepaid numbers ending in 1 is today, and operators have the following 72 hours to suspend lines that remain unlinked. Later deadlines run through December 31 according to the final digit of the Mexican phone number.

The first enforcement round shows that suspension is real but reversible. Reporting based on the Comisión Reguladora de Telecomunicaciones update says 3,627,213 numbers ending in 0 were restored between August 16 and 25 after their users completed registration. By that point, 10,949,349 of roughly 12.2 million numbers in the group had been linked.

For a tourist buying a new Mexican SIM or eSIM, the calendar is not a grace period. New lines have required identity linking since January 9, and a local tourist eSIM may require a valid passport and a live camera check before service works.

The position for international roaming needs more care. Mexico's published rules say the regulator will define a mechanism for lines using international roaming after the 2026 World Cup. We found no later mechanism on the regulator's public registration pages as of August 31. A traveler should therefore distinguish between today's local-line process and a possible future rule rather than treating every international travel eSIM as permanently exempt.

The practical answer: choose a Mexican line when you need a local +52 number or native calls and are prepared to complete its passport process. Choose a data-only Mexico Roaming eSIM when pre-arrival setup, keeping your usual SIM and avoiding a local-number registration workflow matter more. Check again before departure because Mexico has not yet published the promised post-World-Cup process for international-roaming lines.

Mexico's prepaid SIM registration calendar

The Mexican telecommunications regulator's current registration portal assigns the deadline by the last digit of an existing prepaid number. The original June 30 cutoff is no longer the current schedule.

The regulator's June 25 announcement says this timetable is for prepaid lines that were already active but had not been linked. It also gives operators the following 72 hours to suspend lines that remain unlinked. Movistar's current page displays the same dates.

What the first Mexico SIM suspensions show

The August 15 deadline for numbers ending in 0 was not merely advisory. Xataka Mexico's report on the CRT figures says 3,627,213 suspended lines were reactivated between August 16 and 25 after their users completed the linking process. It also reports that 10,949,349 numbers ending in 0 had been linked out of roughly 12.2 million in that group.

Those figures do not say how many tourists were affected, and they should not be used to estimate visitor demand. They do confirm three practical points:

• operators are applying the staggered deadlines;
• a suspended number is not automatically cancelled; and
• completing the identity process can restore ordinary service.

A traveler retaining an older Mexican prepaid line should register before its number's deadline rather than planning to restore it after arrival. Anyone whose number ends in 1 should act on August 31. A number ending in 2 has until September 15, but the registration can be completed earlier.

A monthly contract is a different case. The customer is normally identified when the contract is opened, so the regulator's public FAQ says postpaid users do not repeat the prepaid registration process. Confirm the status with the operator rather than assuming a contract or older number is already linked.

New Mexican SIMs and eSIMs do not get the staggered grace period

January 9 is the important date for a visitor purchasing a new local line. Since then, a newly contracted Mexican mobile number must be associated with its user before full service is available. That rule follows the line, not the piece of plastic.

Do not use the word eSIM as the dividing line. A Telcel eSIM that creates a Mexican prepaid number is local. A Roaming eSIM profile is a travel-data service that connects through roaming arrangements. Those products can both be installed digitally while having different identity, voice and support terms.

What a foreign visitor needs to register a Mexican line

The most useful confirmation comes from operators' live pages, not from an old general SIM guide. Telcel's Tourist International eSIM terms say the line must be registered before it can be used. The traveler installs it on a compatible unlocked phone, grants camera access, captures a valid passport and completes a liveness check.

Telcel allows up to three remote registration attempts. Its page directs a traveler who cannot finish the check to phone support or a Customer Service Center. The plan starts when the eSIM is installed, so installing it without promptly completing registration can consume part of the validity period.

Movistar's registration page also says a foreign visitor can link a line with a current passport. The flow captures the number, the identity document and a selfie. The company says the images are deleted after validation and are not kept as a biometric database.

The exact screens, supported documents and fallback process can differ by operator. Before paying for a local line, ask these questions:

• Can this exact tourist product be registered with a foreign passport and no resident CURP?
• Can registration be completed before arrival, or must the phone first connect in Mexico?
• When does the paid package start: at purchase, installation, registration or first network use?
• What happens after three failed online checks?
• Does the product include a Mexican number, calls and SMS, or data only?

Keep access to airport or hotel Wi-Fi until the local line is linked and tested. A QR code or an installed profile is not proof that the registration and service activation both succeeded.

What happens if a Mexican prepaid line is not linked

The regulator says an unlinked prepaid line will be suspended within the 72 hours after its assigned deadline. A line that still works briefly after the cutoff is not proof that it is registered or exempt. During suspension, normal calls, texts and mobile data stop. Limited access remains for emergency and public-assistance numbers and for the operator's support channel.

Completing the identity process can restore the line. That makes suspension different from an immediate permanent loss of the number, but it can still disrupt maps, accommodation messages, ride booking and verification texts during a trip.

For a newly purchased tourist line, the practical effect arrives sooner: the operator may withhold normal service until the passport check succeeds. Buying a physical SIM at a convenience store does not guarantee that a visitor can leave the shop with working data. Ask the seller to remain available until the line has been linked and a real data connection has been tested.

Mexico has not completed the international-roaming part of the rule

The published Mexican line-identification rules contain a separate clause for international roaming. It says that after the 2026 FIFA World Cup, the regulator will define the mechanisms needed to link mobile lines using international roaming in Mexico.

The tournament ended on July 19. As of this article's August 31 review, the CRT registration portal still describes the Mexican prepaid calendar and operator linking routes, but we did not find a newly published traveler procedure for a home-country roaming SIM or an international travel eSIM.

That absence is not evidence of a permanent exemption. It means the practical process is currently unspecified in the official material reviewed. Travelers using home roaming or a travel eSIM should check the CRT and provider terms again close to departure, especially for trips later in 2026.

Some ranking pages state flatly that international eSIMs are exempt. That was a reasonable description of the temporary World Cup treatment reported in May, but it is too broad after the event because the legal text expressly points to a later decision. We will update this page if the regulator publishes that mechanism.

When a Roaming eSIM is the simpler Mexico choice

A short-stay visitor often needs data for airport pickup, maps, hotel messages, translation and banking apps, but not a new Mexican phone number. In that case, a Mexico Roaming eSIM avoids opening a local +52 line and can be purchased before travel.

The live Mexico catalog currently offers fixed-data and daily plans. Cards show the price, allowance, validity, speed label, named supported networks and whether that exact package is eligible for top-up. The network list can vary by package, so read the selected card rather than assuming every plan uses every Mexican operator.

🏆 Where Roaming eSIM wins: it gives a data-focused traveler a pre-arrival purchase path, keeps the usual SIM in the phone, shows plan terms before checkout and provides 24/7 support without requiring the traveler to open a Mexican local number. That is a practical advantage over a local tourist line when data is the only requirement and passport registration would add an unnecessary arrival task.

The tradeoff matters. Roaming eSIM plans are data only unless a card explicitly states otherwise. They do not provide a Mexican number, replace native emergency calling or guarantee that a home SIM can receive bank texts without roaming charges. Keep the home line only if its carrier terms make sense, and use the travel eSIM versus roaming guide to separate the two bills and services.

For a trip that continues to the United States or Canada, compare the Mexico plan with a North America Roaming eSIM. Confirm all countries on the exact plan; a regional name alone is not a coverage promise. The country versus regional plan guide explains that choice.

A Mexico connectivity checklist before departure

1. Decide whether you actually need a Mexican phone number. If not, a data-only travel plan may remove an avoidable local registration task.
2. Confirm that the phone is unlocked and supports eSIM with the compatibility checker.
3. If buying a Mexican tourist SIM or eSIM, use the operator's official channel and have the passport available.
4. Ask exactly when validity starts. Telcel's tourist eSIM clock starts at installation, not after a later troubleshooting session.
5. Keep working Wi-Fi until installation, identity linking and mobile data have all been tested.
6. If retaining an older Mexican prepaid number, use its last digit to find the deadline and verify its linked status with the operator.
7. If using home roaming or Roaming eSIM later in 2026, recheck whether the CRT has published its international-roaming procedure.
8. Download the hotel address, transport details and an offline map before the flight.

The installation timing guide helps avoid starting a plan too early. For a reloadable package, use the support path shown for that plan; not every package can be topped up.

Traveler questions about Mexico's SIM registration

Do tourists have to register a SIM card in Mexico in 2026?

Yes, when the tourist opens a Mexican mobile line. Current Telcel and Movistar pages accept a valid foreign passport in their stated tourist or foreign-user processes. A later process for lines using international roaming was promised but was not published on the CRT registration portal when checked on August 15.

Does the rule cover a Mexican eSIM as well as a physical SIM?

Yes. The identity requirement applies to the Mexican mobile line. Telcel's current Tourist International eSIM page expressly requires registration before the service can be used.

Do I need a CURP if I am visiting Mexico on holiday?

Telcel's dedicated tourist eSIM flow says a valid passport and liveness check are used. Movistar says foreign visitors can link with a valid passport. Other products or generic operator flows may present different fields, so confirm the exact tourist process before purchase.

Can I register a Mexican tourist eSIM before landing?

It depends on the operator and product. Telcel tells buyers to install its tourist eSIM at the destination and requires Wi-Fi for installation. Check whether registration is available before arrival and when the plan clock starts rather than assuming advance purchase equals advance activation.

What does Mexico's August 31 SIM deadline cover?

It covers previously active, unlinked Mexican prepaid numbers ending in 1. Operators have the following 72 hours to suspend lines that remain unlinked. Numbers ending in 0 passed their deadline on August 15, while later digits follow the published calendar. New lines acquired since January 9 must be linked for service from the start.

What happens if my prepaid number ends in another digit?

Its deadline falls later, from August 31 through December 31. Use the current CRT table and do not rely on the superseded June 30 cutoff still shown in some older articles.

Will an unregistered Mexican line still call 911?

The official registration information says a suspended line retains limited access to emergency and public-assistance numbers and the provider's support system. Do not treat that limited access as a substitute for a fully tested emergency communication plan.

Is an international travel eSIM exempt from Mexico registration?

There is no published traveler registration workflow on the CRT portal as of August 31, but the legal text says the regulator will define a mechanism for international-roaming lines after the World Cup. It is more accurate to call the position unresolved than to promise a permanent exemption.

Does Roaming eSIM give me a Mexican phone number?

No, not unless the selected card explicitly says it includes one. The Mexico plans should be treated as data plans. Keep or arrange a separate line if native calls, SMS or a local number are essential.

Should I choose a local Mexican line or Roaming eSIM?

Choose a local line when its +52 number, native voice or local bundle is worth the passport process. Choose Roaming eSIM when you mainly need data, want to buy before travel and prefer not to open a Mexican local line. In both cases, check the exact package, phone compatibility and current regulator guidance.

Sources and updates

This report was rechecked on August 31, 2026 against the CRT registration portal and June calendar, the regulator's 72-hour suspension instruction, the published line-identification rules, Telcel's tourist eSIM and registration pages, Movistar and AT&T registration pages, and reporting of the CRT's first suspension and reactivation figures. Operator terms and the regulator's international-roaming position can change; material changes will be dated on this page.