Mexico mobile line registration: new calendar & deadlines

Travel & Connectivity • Reading time: 1-2 minutes

Imagine this: your brother in Mexico is waiting for an important call, or a friend visiting the country for the World Cup is navigating Mexico City with maps, translation apps, transport updates, and WhatsApp. You send them a mobile top-up so they do not run out of data, but there is one problem a recharge cannot fix: if the line itself is not properly registered within its official government window, mobile service can be suspended.

Mexico has introduced a mandatory mobile line registration process. To prevent system overloads across network providers, the Commission for Regulating Telecommunications (CRT) has officially shifted away from a single blanket deadline, implementing a strategic, phased calendar based on the final digit of each phone number. Under this new framework, existing prepaid and postpaid lines must be linked to an identity between August and December 2026. Lines that are not registered by their designated digit deadline face immediate service suspension exactly 72 hours after their specific cutoff passes.

For migrants, expatriates, families abroad, and travelers who regularly support loved ones in Mexico through international mobile recharges, this regulatory change matters. Keeping a balance on the account is no longer enough; the mobile line also needs to remain active and registered with the operator according to the new government timeline. CY.SEND can help you keep supported Mexican numbers topped up from abroad, but the registration itself must be completed through the official operator or CRT channels.

Why is Mexico making mobile phone registration mandatory?

The registration requirement is part of a national effort to reduce anonymous misuse of mobile lines. Mexican authorities have presented the measure as a way to combat crimes such as fraud, extortion, and virtual kidnapping, which can rely on anonymous prepaid numbers.

The official registration portal explains that the goal is to associate each mobile line with a CURP in order to identify and suspend anonymous lines used for telephone fraud, extortion, or virtual kidnapping. For companies or legal entities, registration may be associated with business data such as RFC.

This policy has also sparked public debate around privacy, data protection, and implementation risks. According to the recent CRT official press release, a structured phase-out was necessary because millions of active mobile lines still need to complete the verification pipeline. For that reason, users should complete the process only through official operator portals, the official CRT portal, or authorized customer service centers. Avoid unofficial links, social media forms, or messages asking for payment to register a line.

The 2026 phased rollout: check your specific deadline

The key update is the elimination of a single expiration date. Mobile lines must now be registered according to a phased monthly schedule tied directly to the last digit of the 10-digit telephone number. If a line is not linked by its designated date, network operators are legally required to restrict services within the next 72 hours.

To avoid sudden disconnection and keep your family connected, check the official CRT calendar below to identify the precise deadline corresponding to the mobile number's final digit:

Last Digit	0	1	2	3	4	5	6	7	8	9
Deadline	Aug 15	Aug 31	Sep 15	Sep 30	Oct 15	Oct 31	Nov 15	Nov 30	Dec 15	Dec 31

Once the 72-hour grace window expires, an unregistered line will instantly lose standard cellular features, blocking incoming and outgoing calls, text messages, and mobile data access. During this administrative freeze, the phone will only be allowed to contact emergency numbers, citizen helpline services, or the direct support lines of their telecom company, alongside receiving local earthquake alert signals. For families abroad who send top-ups, the practical issue remains: a recharge helps only if the mobile line is legally active and authorized to receive network signals.

To understand how other regions manage similar mobile identity rules, you can also read our guide on SIM card regulations across Europe.

Which mobile operators are affected?

The requirement applies to mobile lines in Mexico, whether prepaid or postpaid. This includes lines with major operators and mobile virtual network operators. Users should check directly with their provider because each operator may have its own app, web portal, customer service flow, or in-store process.

Telcel: Mexico’s largest mobile operator by users, with a major share of prepaid lines.
AT&T Mexico and Movistar: major national operators that provide registration options through their official channels.
Bait and other MVNOs: Brands like Unefon, Flash Mobile, Virgin Mobile, and Oxxo Cel are bound by the exact same legal framework; if the line runs on Mexican infrastructure, it must be registered.

If you are unsure which operator your family member uses, ask them to check their SIM packaging, mobile app, latest recharge receipt, or network name. Selecting the correct operator is also important when sending a mobile top-up through CY.SEND.

Step by step: how to register a Mexican phone line

The registration process is free. The official CRT portal states that users can register through their mobile phone by entering the operator portal, selecting the company, and following the instructions. Users can also complete the process in person at their operator’s customer service center with a valid ID.

Be careful with scams. If someone asks your family member to pay a fee to keep their line active, or sends a suspicious link outside the official operator or CRT channels, treat it as a potential phishing attempt.

What information do you need?

The exact process can vary by operator, but users should be ready with the following:

Requirement	What it is for
Mexican mobile number	The 10-digit mobile number that needs to be registered.
CURP or applicable identity data	For individuals, the CURP is used to associate the line with a person. For companies, business registration data may apply.
Valid identification	The official CRT portal indicates that users may need a valid ID and may be asked to take photos of the document during the process.
Camera access	The process may include a liveness check using the phone camera. Official guidance says this is not the same as storing fingerprint or iris biometric data.
Confirmation folio	After completing registration, the operator should provide a confirmation folio. Save it.

Can you complete the process remotely for a family member?

You can guide a family member from abroad, but you should not register a line under the wrong person’s identity. The official CRT FAQ says the identification must match the person who completes the registration. If your parent, child, or relative needs help, the safest approach is to walk them through the official operator portal or help them find an authorized service center.

If your relative lives outside Mexico but has a Mexican mobile line, the CRT indicates that people with a Mexican operator line can complete the registration remotely with valid Mexican identification.

How to help your family prepare

Confirm the operator and line digit: Ask your family member whether the line is Telcel, AT&T, Movistar, Bait, or another provider, and look at the final number of the line to confirm their monthly window.
Use official portals only: Start from the official CRT registration portal or the operator’s official app or website.
Keep the phone nearby: The user will need to receive a temporary validation PIN via SMS to authorize the registration process.
Save the confirmation: Keep the registration folio or receipt screenshot in a safe place.
Check the status later: Use the official operator or CRT consultation tool to confirm the line is linked correctly before their digit deadline hits.

Are you in Mexico for the World Cup 2026? Compliance rules for international fans

The timing of the registration mandate heavily intersects with the FIFA World Cup 2026, which runs from June 11 to July 19 across Mexico, the United States, and Canada. Mexico is one of the host countries, with matches in Mexico City, Guadalajara, and Monterrey. While the new phased calendar shifts blanket cutoffs to later months based on number endings, lines activated during the tournament must still comply with identity linking regulations upon acquisition.

If you are visiting Mexico during the tournament and plan to buy a local SIM or eSIM with a Mexican mobile number, expect the provider to require registration or identity verification using your foreign passport data page and entry stamps as part of activation. If you prefer not to handle local registration after landing, compare options before traveling, including international roaming, travel eSIMs, or other global connectivity products.

If you are currently planning your route through the capital, review our guide to navigating Mexico City like a local during the World Cup. For a broader travel overview, see our guide to the World Cup host cities across Mexico, Canada, and the USA.

How international fans should approach local SIM cards and eSIMs

Not every mobile product works the same way. A local Mexican SIM or eSIM associated with a Mexican mobile number may require registration through the provider. A travel eSIM from an international provider may work through roaming or data-only access and may follow a different activation process.

Before choosing, ask three questions:

Does the product give me a Mexican phone number or only data?
Does the provider require passport, CURP, or another form of identity verification?
Will I need SMS for banking, ride-hailing, event tickets, or account recovery?

For more help comparing options before a cross-border trip, read our guide to eSIMs vs local top-ups for cross-border trips.

Keep sending mobile top-ups with peace of mind through CY.SEND

CY.SEND helps families, travelers, and international users send mobile top-ups and other digital products across borders. For Mexico, this can be useful when you want to support a family member, keep a prepaid number active, or help someone traveling in the country stay connected.

However, a mobile top-up is not a substitute for line registration. If the mobile operator suspends service because a line missed its designated digit cutoff, adding balance will not restore calls, SMS, or data until the user completes the required linking process with the provider. That is why it is important to help your family verify their line according to the CRT calendar.

Once the number is correctly registered and active, you can continue using CY.SEND to send mobile top-ups to supported Mexican numbers and operators. Mobile top-ups are usually delivered instantly or within a few minutes after payment confirmation, but timing can vary depending on the operator, product, and transaction review.

Key takeaways

Mexican mobile lines must now be registered according to a phased calendar running from August to December 2026.
The enforcement schedule is determined entirely by the final digit of the 10-digit telephone number.
Unregistered lines face a service block 72 hours after their monthly deadline, but full service is restored once registration is complete.
The process is free and should be completed through official operator or CRT channels.
The registration applies to prepaid and postpaid mobile lines alike.
Individuals can register up to 10 lines, while companies may have different limits.
The user completing the registration must match the identity being validated.
CY.SEND can help with mobile top-ups, but the operator registration must still be completed separately.

Frequently asked questions

Can I register a phone number online if I am currently outside Mexico?

In many cases, yes, but the process depends on the operator and the user’s identity documents. The official CRT FAQ states that Mexicans living in the United States with a Mexican operator line can register remotely with valid Mexican identification. If you are helping a relative, guide them through the official process, but do not register the line under the wrong identity.

What should I do if my relative in Mexico does not know their CURP?

They should retrieve it through the official Mexican government CURP portal or ask for help through official government channels. Do not use unofficial websites that ask for unnecessary personal information.

I am using an eSIM for my trip to Mexico; do I still need to register it?

It depends on the type of eSIM. A local Mexican eSIM or SIM with a Mexican mobile number may require registration. A travel eSIM from an international provider may follow different rules. Check the provider’s activation and identity requirements before buying.

Will I lose the remaining balance on my prepaid card if my line gets suspended?

If the line is suspended after missing its digit deadline, you will lose access to calls, SMS, mobile data, and active packages until the service is recovered. The operator will hold the network functions in an administrative freeze, but once registered, everything is restored. We recommend registering before your number's cutoff to avoid service interruptions.

Can one person register multiple phone lines under a single CURP?

Yes, within limits. Official guidance states that individuals can register up to 10 lines, while companies do not have the same limit. Each line should be registered accurately and with proper consent.

Is my personal and biometric data safe with the mobile operators?

Operators are responsible for collecting and protecting registration information. Official guidance says the process does not request fingerprint or iris data, and the liveness step is used to verify that the person is real. Still, users should register only through official channels and avoid suspicious links.

How do I verify if a phone line in Mexico has already been successfully registered?

Use the official operator platform or the CRT registration portal’s consultation option. After completing registration, your operator should send a confirmation folio. Save it.

What happens if an international tourist buys a SIM card after the deadline has passed?

New lines sold after the law’s initiation must be associated with an identity before full service is activated. Tourists should expect to follow the provider’s identification process via passport or choose an alternative such as roaming or a travel eSIM.

Can a suspended line be recovered after its deadline, or is the number lost forever?

Official guidance indicates that if the line is suspended for lack of registration, service will be recovered and fully reinstated once registration is completed. During suspension, the phone can still receive seismic warnings and dial emergency services, but you shouldn't wait until the freeze happens if the number is crucial for work, banking, or family contacts.

Does this registration law affect landline home internet or fiber optic services?

The registration requirement focuses on mobile lines, including prepaid and postpaid cellular service. Fixed home internet or fiber services usually already have account holder and billing information. Families that rely on mobile data outside the home should still make sure their mobile lines are registered and active.