Before you start

An unlocked, band-compatible handset
Passport, or resident card once issued
A CURP — residents get one automatically, and non-residents can pull a temporary one from RENAPO
A Mexican payment method for postpaid plans

Step-by-step

1
Buy prepaid on arrival
Telcel Amigo has the broadest coverage in the country and is the safe default if you will drive to Tulum, Valladolid or the cenotes. Bait, on the Altan network, and weex are cheaper but thinner outside the built-up areas, and 'outside the built-up area' on this peninsula means jungle. SIMs are sold at OXXO, Walmart, carrier stores and the airport.
In personWho: YouUnder 30 minutesMXN 50–150 for the SIM
2
Register the line to your CURP and ID
Link the number to your CURP and a passport, INE or resident card through the carrier's portal or app. It is free, takes minutes, and is now the difference between a working line and a dead one. One person may hold up to ten lines under a single CURP. Postpaid contracts were registered when you signed them; it is prepaid that needs doing.
OnlineWho: Every prepaid line holderSame dayFree
3
Keep the number alive with recharges
Prepaid packages expire, typically after 30 days, and an unrecharged number can eventually be recycled. Dial *133# to check balance, data and expiry without using data. Losing a number that receives your bank's one-time codes is a slow, avoidable disaster.
Mobile appWho: YouAround MXN 200 for a 30-day bundle
4
Order fibre and ask what the building actually has
Telmex, Totalplay and Izzi cover the supermanzanas and symmetric fibre is cheap by international standards. In a newer tower or gated development, ask which providers are physically cabled to the unit — as elsewhere in Mexico, a single provider sometimes wired the building. In older properties, ask where the ONT can sit and whether the building's cabling has survived a few wet seasons.
OnlineWho: YouOne to three weeks including an engineer visit
5
Build redundancy before hurricane season, not during it
If your income depends on being online, you want two independent paths: fibre plus a mobile plan with real hotspot data, ideally on a different carrier, plus a power bank or small UPS that will run the router and your laptop through a two-hour outage. Cancún loses power for hours several times a wet season and for much longer after a storm. This is a MXN 2,000 problem to solve in April and an unsolvable one in September.
Mobile appWho: Remote workersBefore June
6
Switch to postpaid once you have a bank account
Postpaid plans cost less per gigabyte but require a credit check, a Mexican address and usually a local card or direct debit. Number portability lets you keep your number; never cancel the old plan before the transfer completes.
OnlineWho: You≈MXN 200–600 a month

Documents you’ll need

Passport or resident card
CURP, definitive or temporary
Mexican bank card or account for postpaid billing
Proof of address for fixed-line installation

Things most newcomers don’t know

The registry that came back is CURP-based, not biometric — and it will suspend your line.

The Supreme Court struck down PANAUT, which would have collected fingerprints and iris scans, and many arrivals still believe Mexican prepaid is anonymous. Linking a line to a CURP became compulsory on 9 January 2026, and unregistered prepaid numbers are being suspended on a rolling calendar running from 15 August to 31 December 2026 by the last digit. No biometrics are taken, but a suspended SIM stops receiving your bank codes.

Source: CRT — registro de líneas móviles

You do not need residency to register a line — a temporary CURP is enough.

People arriving on a tourist entry, which in Cancún is most people, assume the registration rule locks them out of a Mexican number. RENAPO issues a temporary CURP to foreigners against a passport, free and online, and that satisfies the requirement. It is a five-minute fix that saves weeks of roaming charges.

Source: RENAPO / gob.mx

The network you rely on is sized for a tourist city, and you will notice at the wrong moments.

Cancún's mobile capacity contends with millions of visitors a year, concentrated in the same places at the same times. Around the airport at a peak arrival bank, in the Zona Hotelera during an event, and in the supermanzanas during a power outage, throughput degrades in ways that are invisible on a coverage map. For anyone taking calls for a living, that is the argument for a wired connection at home rather than working off a phone.

Source: community-reported

Power, not connectivity, is usually what takes you offline.

Fibre in Cancún is good; the electricity supply during the wet season is the weak link, and a fibre ONT and a mesh router are useless without it. The cheap fix is a small UPS sized for the router and the ONT, which keeps you online through the short outages that make up most of them, and a charged phone plan with hotspot data for the long ones.

Source: community-reported

Common mistakes to avoid

Never registering the line to a CURP and losing the number and your two-factor codes.
Assuming a tourist cannot register a line — a free temporary CURP solves it.
Relying on a single connection and a single power source in a city that loses both several times a season.
Letting prepaid credit lapse until the number is recycled.
Choosing an MVNO on price and then discovering the coverage on the road to Tulum.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.