Claro vs Movistar vs Personal, what actually works once you're past Buenos Aires, and why the Ezeiza SIM counter is one line you can just... not stand in. Plus how much data Route 40 really burns.
Networks
Claro · Movistar · Personal
Best network
Claro — widest Patagonia reach
SIM registration
Passport + CUIL for physical SIMs
eSIM advantage
Skip the Ezeiza kiosk queue entirely
Why skip the airport SIM counter in Argentina
You land at Ezeiza at 6am, half-asleep after the overnight from Miami or Madrid, and the Claro kiosk already has eight people in front of it. Passport out, form filled in by hand, and then the agent pauses because the form wants a CUIL number — a local tax ID that, obviously, you don't have. Nobody warns you about this part. It's not that the staff are unhelpful; they've clearly done this dance with tourists a hundred times. It just eats twenty, thirty, sometimes fifty minutes you didn't budget for.
An eSIM skips this entirely
A travel eSIM rides on your existing phone number, so there's no CUIL/CUIT box to fill in and no counter to find in the first place. Install it over the terminal Wi-Fi while you're still in the passport queue and you're online before you've even picked up your bag.
Claro vs Movistar vs Personal
Network
Strengths
Best for
Claro
Argentina's widest overall footprint; strongest signal in Patagonia towns, the Andean northwest, and along Route 40; the network most international eSIM providers default to
Patagonia, Salta/Jujuy road trips, and anyone leaving Buenos Aires
Movistar
Excellent in Buenos Aires and the Litoral (Iguazú, Corrientes); competitive 4G speeds in cities; reliable in Mendoza wine country
City-and-wine-region itineraries, Iguazú Falls day trips
Personal
Solid Buenos Aires and coastal Atlantic coverage (Mar del Plata); the domestic carrier of choice for many locals
Buenos Aires-only trips, Atlantic coast beach towns
Coverage by destination
Nobody quite grasps how big Argentina is until they try to plan a route through it. Ushuaia to the Bolivian border is about the same distance as Oslo to Cairo. Cities and provincial capitals — fine, no drama, full bars. It's the twelve hours of nothing between them that catches people out.
Buenos Aires
Palermo, Recoleta, San Telmo, the microcentro — all excellent 4G/5G. The Subte loses signal underground on the older A and B lines, so don't count on maps working mid-ride. Both airports have coverage the second you step off the jet bridge.
Iguazú Falls
Both the Argentine and Brazilian sides hold signal, including the Circuito Superior and Inferior walkways. On the Garganta del Diablo catwalk your phone still gets bars — not that you'd hear it ring over the noise.
El Calafate & Perito Moreno Glacier
Town: solid 4G, no complaints. The viewing platforms 90 minutes out are weaker but workable. The boat that takes you up to the ice face loses signal for a stretch — nobody's fixing that anytime soon.
El Chaltén & Fitz Roy
Town center is fine. Laguna de los Tres and Laguna Torre go dark about an hour into the trail. Screenshot the map before you start walking — this hike punishes anyone who didn't.
Ushuaia
Town and the Beagle Channel waterfront: good 4G. Tierra del Fuego National Park drops off fast past the gate. Antarctica-bound ships lose everything within the first hour out of port.
Bariloche & the Lake District
Town and Nahuel Huapi: strong. Circuito Chico holds up for most of the drive. Cerro Catedral covers the base fine but gets patchy near the top lifts, which is exactly where you'd want a photo.
Mendoza wine region
Reliable 4G through Luján de Cuyo and the Uco Valley — handy for booking a last-minute malbec tasting when the first one falls through. Aconcagua base camp treks lose signal almost the moment you leave the trailhead.
Salta & Jujuy (the north)
Salta city and Purmamarco: fine. The Salinas Grandes salt flats and the Quebrada de Humahuaca canyon road are hit and miss — twenty, forty minutes with nothing depending on the terrain that day.
3-week full-country trip incl. wine region and the north
18–20 GB
Remote work / digital nomad
35–50 GB per month
Route 40 and rental car tip
Self-driving Route 40, or crossing over to the Carretera Austral in Chile? Budget more data than you'd think. Google Maps chews through it re-routing every time the gravel road signal drops and picks back up — and on the stretch south of Perito Moreno town, it drops a lot. Download Patagonia's offline map layer before you leave Buenos Aires. It's a few hundred MB, done once, and it means a dead zone outside El Chaltén doesn't turn into a wrong turn.
Frequently asked questions
What is the best eSIM for Argentina?
Claro, hands down, once you're past Buenos Aires — it reaches into Patagonia and the northwest in a way the other two don't. Movistar and Personal hold up fine if you're sticking to cities and coast.
Do I need to register a SIM card in Argentina?
Technically yes, and it's more paperwork than it should be — passport, sometimes a CUIL/CUIT number you won't have as a tourist. A data-only eSIM sidesteps the whole thing because it's not a new local number.
Does eSIM work in Patagonia?
In the towns, yes — El Calafate, Ushuaia, Bariloche, El Chaltén all get usable 4G. Out on the glacier trails or the long stretches of Route 40, no, and that's just physics: no towers, no signal. Download your maps first.
How much data do I need for a trip to Argentina?
A 10-day Buenos Aires and Iguazú trip needs about 8–10 GB. A 2–3 week Patagonia-inclusive itinerary with heavy GPS use runs 15–20 GB.
Will an eSIM work with Uber and Cabify in Argentina?
Yes — ride-share apps work fine over data-only eSIM since they use your existing account, not a new local number. Apps that need SMS verification from an Argentine number are the one exception.