By Neft Román — Legacy Vallarta Realty
Most newcomers treat getting a local SIM card as a minor errand. It’s not — in Mexico, your phone number quietly becomes the backbone of your entire digital identity, and losing access to it can be far more disruptive than it sounds.
Why It’s Tied to Everything
Mexican banking apps — BBVA, Banorte, and the rest — require a Mexican number for two-step verification, and they generally can’t send those codes to a foreign number at all. The same goes for government portals like SAT, for Uber and DiDi accounts, and for WhatsApp, which functions as the default communication channel for everything from your property manager to your doctor’s office here. If your number is tied to all of that and you lose it, you’re not just missing calls — you can lose access to banking, official accounts, and daily communication in one shot.
The 2026 Registration Requirement
Mexico now requires every prepaid mobile line to be linked to a verified identity, and an unregistered line gets suspended. The rules moved while this guide was sitting online, so here is where they stand as of October 21, 2026, according to Mexican press coverage of the telecom regulator’s (CRT) schedule. The original deadline was June 30, 2026. The regulator then extended it for prepaid lines and staggered it by the last digit of your number:
- Ends in 0: August 15 · ends in 1: August 31 · ends in 2: September 15 · ends in 3: September 30 · ends in 4: October 15 (these have all passed)
- Ends in 5: October 31 · ends in 6: November 15 · ends in 7: November 30 · ends in 8: December 15 · ends in 9: December 31
After your date, the carrier has up to 72 hours to suspend the line. While suspended you can dial emergency numbers and receive seismic alerts, but not regular calls, texts or data. Postpaid (contract) lines are generally treated as already verified. Deadlines can shift again, so confirm yours with your carrier or the regulator’s registration portal before relying on this list.
For foreigners, the commonly reported requirements are a valid passport plus a CURP. If you do not have a permanent one yet, a temporary CURP can be issued through RENAPO. A brand-new SIM will not work until it is linked. Registration is free and done through your carrier’s app, website or a store; be wary of anyone calling or texting to “help” you register, because carriers do not ask for banking passwords or codes.
If Your Line Gets Suspended
You do not lose the number. Finishing the registration reactivates it, and the registration portals generally work even without balance or data. You will want your ID, your CURP and a quick selfie-style liveness check. The catch is the cascade: while the line is down, bank-app codes, WhatsApp verification and ride-hailing logins that depend on that number stop working. If you pay a monthly plan, ask whether billing continues during the suspension. If your carrier cannot fix it, the CRT runs a help line at 079.
Practical Advice
- Get a Mexican SIM early, even if you keep a foreign number too — don’t wait until you need it for a bank account
- Complete the passport/CURP registration as soon as you activate the line
- Avoid changing numbers once your accounts are set up — migrating banking and WhatsApp verification to a new number is more friction than it looks like
- Keep your CURP and RFC handy, since carriers and banks alike will ask for them
Where to Go From Here
This ties directly into getting your paperwork in order early — see which documents you actually need as a foreigner in Mexico for the full picture of what to get first.
This article is for general information only. Telecom and registration requirements change — confirm current rules directly with your carrier before relying on this information.
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Legacy Vallarta Realty — Puerto Vallarta, Jalisco.
— Neft Román, Legacy Vallarta Realty
Affiliate of AMPI Puerto Vallarta y Compostela
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