Mexico is requiring prepaid mobile lines to be linked to a CURP, the national ID code. According to the official site of the Comisión Reguladora de Telecomunicaciones (CRT), the goal is to find and suspend anonymous lines used for crimes such as fraud and extortion. It is not a spam filter: nothing on the official page says it blocks or labels the calls you receive.
This page only repeats what the CRT’s own site, registratulinea.crt.gob.mx, showed on 2026-10-08. Dates in programs like this can change, so check the site yourself.
What is the registration?
The CRT describes it as associating each line with a CURP “para identificar y suspender las líneas anónimas” used for crimes like fraud, extortion or virtual kidnapping by phone. Your phone company runs the process. You need a current ID card, and the registration is free.
It applies to prepaid (“recarga”) lines. The CRT says postpaid lines are already registered, since they are tied to your name when you sign the contract.
What are the deadlines?
The deadline depends on the last digit of your number:
| Last digit | Deadline |
|---|---|
| 0 | 15 August |
| 1 | 31 August |
| 2 | 15 September |
| 3 | 30 September |
| 4 | 15 October |
| 5 | 31 October |
| 6 | 15 November |
| 7 | 30 November |
| 8 | 15 December |
| 9 | 31 December |
The site says unlinked lines are suspended at the end of each period. After your deadline, your company has 72 hours to suspend the line temporarily. On the day we read it, the page showed a counter reading “77% del total” under “líneas vinculadas”, dated “Corte al 07 de octubre”.
How do you register?
According to the CRT, you go to your phone company’s portal (the CRT site links to each one), enter your number, photograph both sides of your ID, and confirm your identity with your phone’s camera. In person, you can go to your company’s customer service center with your ID. When you finish, your company sends a confirmation folio by SMS.
A few rules from the same page:
- You cannot register on someone else’s behalf, but an individual can register up to 10 lines in their own name (for parents, spouse or minor children).
- Minors cannot register. A parent or guardian must.
- No balance is needed, only internet access through data or Wi-Fi.
- The CRT says no fingerprint, iris or other biometric data is stored, and that the process does not allow tracking or access to your communications.
- Help line: 079.
What happens if you miss your deadline?
The CRT says the line is suspended temporarily. You could not make or receive calls or SMS, or top up. Emergency and citizen-help numbers such as 911, 079 and 089, calls to your phone company and the earthquake alert still work. Once you register, the line is reactivated.
Is it a spam filter?
No. The CRT presents the registration as a way to cut anonymity behind crimes. It says nothing about blocking, labeling or warning you about incoming calls. The page gives no figures on how the registration changes the number of spam calls, so we make no promise about that either.
For your own calls, you still need your own habits:
- Do not share bank PINs or codes by phone (what CONDUSEF says).
- Know what REPEP does and does not stop.
How do you avoid fake registration offers?
The CRT’s FAQ has a question on avoiding fake registration pages, and it gives two useful rules. Phone companies do not make confirmation calls, so a call asking you to “confirm” your registration is not from them. And you should enter only your company’s official portal, never a link sent to you. The page also says that if the SMS to continue the process does not arrive, you should check your spam or unwanted-messages folder.
Facts from the CRT’s site, read on 2026-10-08. If your situation is unusual (a business line, a SIM abroad, a change of company), read the FAQ on the official page or call 079.
