SIM Cards and Data Plans: Staying Connected from Mazunte to Huatulco

Getting connected on this coast is not the chore people expect. Every town between Mazunte and Huatulco has cellular service, and the cities at either end have more of it. What needs thought is which network you pick, how you pay for it, and whether your plan matches a stay that tends to stretch from a month into a season.

This guide assumes you are staying a while — or long enough that 'while you look at land' stops being hypothetical. For that kind of trip, an e-sim bought before you fly is the wrong tool, and a postpaid contract is nearly as wrong. The right answer on the Oaxaca coast is almost always a prepaid SIM from Telcel, bought after you land. Here is the plain version of why, and what it costs.

The networks

Which network: Telcel, AT&T, and Movistar on the coast

In Mexico the carrier choice is really three — Telcel, AT&T Mexico, and Movistar. On this coast the honest version is shorter: Telcel first, and the other two only if your plans keep you in town.

Telcel is the incumbent and by far the largest network in Mexico. It built out the rural coverage the others skipped, which matters here because most of this coast is rural. Its towers reach the villages, most of the hillsides, and most of the coves worth swimming in. AT&T Mexico is strong in the cities and along Highway 200. Movistar, the smallest of the three, is thinner still. All three work fine in Puerto Escondido and Huatulco; between them, coverage is Telcel's game.

Network	Coverage on the coast	Shops and SIMs	E-sim	Bottom line
Telcel	Best by far — every town, most hillsides and coves.	Official stores in Puerto Escondido and Huatulco; kits at countless corner shops.	Possible on newer phones, but the physical SIM is the norm.	The default for the villages.
AT&T Mexico	Good in the towns and along Highway 200, thin beyond.	Fewer stores; kits at some shops.	Available.	Fine if you mostly stay in town.
Movistar	Towns and main roads only.	Rare outside the cities.	Limited.	Hard to recommend here.

Roaming on your home plan is the fourth option, and the most expensive. Many US and Canadian plans include Mexico, but the fine print throttles data and daily fees add up over a season. For anything longer than a week, buy local.

If Telcel has no bars on a lot you love, the other networks will not save you.

Buying a SIM

Buying a SIM as a tourist: passport, no RFC

What you need is your passport and an unlocked phone. That is nearly all. Telcel sells its prepaid starter kits — the Amigo line — at its own stores in the bigger towns and at countless small shops, pharmacies, and convenience stores across the coast. The seller registers the SIM against your passport, a light check rather than bank-account paperwork, and you walk out with a working number in a few minutes. You do not need an RFC — the Registro Federal de Contribuyentes, Mexico's tax ID — which surprises people because postpaid contracts ask for one. Tourists never touch it.

Two practical notes. First, unlock your phone before you travel; a carrier-locked phone will not take a Mexican SIM. Second, if you can, buy at an official store in Puerto Escondido or Huatulco rather than a village shop — they set the phone up properly and will load your first data package while you wait. In the villages the corner shop works too; it is just less likely to troubleshoot with you.

All Mexican networks run on GSM, so any unlocked phone from North America or Europe works. Keep the SIM packet — your number is printed on it, and you will want it if the phone ever asks.

Prepaid vs postpaid

Prepaid vs postpaid: the honest math for a season

Postpaid means a monthly contract, a bill, and a credit check. In Mexico it also means paperwork: the providers want an RFC, a Mexican bank account for automatic payments, and a payment history. For a foreigner without residency, that is a wall of friction for no real gain.

Prepaid data plans in Mexico run on recargas — recharges you buy in advance, in any amount, at a corner shop or in the app. No contract, no credit history, no surprise bill. If you leave for three months, you simply stop recharging. To keep the number alive for next season, a small recharge every couple of months usually does it; numbers lapse after a stretch without one, and the window drifts, so ask when you buy.

The honest math for a season: prepaid costs about the same per gigabyte as postpaid, with none of the paperwork and all of the flexibility. Postpaid only starts to make sense once you hold temporary residency and want a single consolidated bill or phone financing. For everyone else on this coast, prepaid wins.

Coverage, town by town

Data realities: from Mazunte to Huatulco, town by town

The road between Mazunte and Huatulco is Highway 200, and signal quality tracks the towns along it. Mazunte gets workable LTE on the hillsides and in town, though it sags at the peak of the winter season. San Agustinillo and Zipolite, next door, share the same towers — fine at the beachfront, patchier in the hollows where hills block the signal.

Puerto Ángel, the working fishing town further east, has decent signal in the centre and around the beach; the coves beyond it, Estacahuite and La Boquilla, get thinner the deeper you go. Then the coast runs quiet until Huatulco, a planned resort with the steadiest infrastructure on the coast: strong LTE in La Crucecita, Santa Cruz, and Tangolunda, and usable signal at most of the nine bays.

The pattern to remember: signal is strongest in the towns, workable on the beaches below them, and patchy on remote beaches and in the jungle valleys behind them. Puerto Escondido, west of Mazunte, has the best urban coverage on the whole coast. For the fuller picture of speeds, fibre, and what fails in the rainy season, our report on internet and remote work on the Oaxaca coast goes deep on all of it.

E-sims

E-sims and keeping your home number

E-sims — Airalo, Holafly, Nomad, and the rest — install before you fly and switch on the moment you land. For the first 48 hours they are excellent. For a season they are the expensive option: data-only, priced per gigabyte well above local rates, and with no Mexican number attached.

That last point matters more than visitors expect. A Mexican number is how the coast talks to you: the broker WhatsApps photos of new lots to it, the notary's office calls it about appointment times, the builder texts delivery updates. Many two-factor logins — including, eventually, a Mexican bank account — send codes to a Mexican number. An e-sim from abroad cannot receive any of that.

The clean setup for a long stay is a dual-SIM phone: your home SIM keeps your usual number for calls and texts over Wi-Fi, while the local SIM carries data and the Mexican number. Most recent phones do this happily. Check whether your home carrier charges for Wi-Fi calling before you go, and turn data roaming off on the home line so it never burns through its allowance.

While you look at land

Staying connected while you look at land

With the phone sorted, the land hunt gets easier. Out on viewings, your phone is the field kit: offline maps for the dirt roads, WhatsApp for the broker, and the camera for walkthroughs you will rewatch at night. Download offline maps of the area — Google Maps lets you save a region — and screenshot each lot's coordinates before you leave town, because the valleys go dark.

Treat a dead zone as information rather than an inconvenience. If a lot sits in a pocket with no Telcel signal at all, that tells you something real about the place: quiet, private, genuinely off-grid. For some buyers that is exactly the appeal. Go in knowing the trade — a clear slice of sky plus a Starlink dish is the usual fix, and it changes the monthly arithmetic. We cover that option honestly in our Starlink on the coast piece.

Keep the local number active through the whole process. Buying land here runs on appointments — broker, notary, surveyor — and they all move by WhatsApp. A US number works, but you will miss messages and pay roaming to read them. The Slow Coast's guide to buying land on the Oaxaca coast walks the full process through, from first visit to notary appointment.

The costs

The costs: what you will actually pay

Telecom pricing in Mexico moves around, so treat any figure here as an indicative picture, not a quote. Check the Telcel app or ask at the shop rather than trusting a blog — this one included — for the current peso price.

That said, the shape of it is stable. The starter kit itself is cheap, typically well under 100 pesos. A mid-size prepaid data package — several gigabytes on LTE, enough for maps, WhatsApp, and light hotspotting — runs roughly 200 to 500 pesos a month, and pay-as-you-go recharges start around 100 pesos whenever you run low. If you hotspot a laptop all day, expect to step up a tier and pay more. Tourist e-sim data, by comparison, typically costs several US dollars per gigabyte, and roaming on a home plan is the most expensive option of all.

Put it in context: a season of solid connectivity costs less than one dinner out in Huatulco's resort zone. Cheap enough that the right advice is boring — buy the Telcel SIM, put a few hundred pesos on it, and stop thinking about it.