Phones, eSIMs and staying connected in Brazil

Do this before you fly

Buy an eSIM, install it, and leave it switched off until you land. It is a QR code and about five minutes of setup, and it means you have data walking off the plane instead of hunting for airport wifi with a taxi to sort out.

Your US carrier will offer you an international day pass. For a trip of more than a couple of days this is almost always the expensive option, and it is the default that most people fall into because it requires no thought. Doing the arithmetic once is worth it.

Two things to check before you buy: your phone has to be unlocked, and it has to support eSIM. Anything reasonably recent does.

Why not a local SIM

A Brazilian prepaid SIM is cheaper than an eSIM and it has one large problem: registering one has historically required a CPF, the Brazilian tax number, which a visitor does not have. There are ways around this, most of them involving a Brazilian friend, and none of them are worth the afternoon.

If you are here for a month or more, it changes the maths and it becomes worth the hassle. For one to three weeks, eSIM.

Coverage, and where it stops

The cities are fine. Rio, São Paulo, Salvador, Florianópolis: 4G and 5G work about as well as they do at home, and often better on public transport.

Outside the cities is where the carrier choice matters, and this is not theoretical. The reason to care is that the places this site sends you are frequently the places with the least signal: the Transpantaneira, the Lençóis, the trails in Chapada Diamantina, the road into Jericoacoara.

Assume you are offline at a jungle lodge, on a river boat, and for large parts of any day in the Pantanal. This is not a problem, but it is a thing to tell whoever is expecting to hear from you.

Download offline maps before you leave the city. Google Maps lets you download a region. Do it for wherever you are driving to, because the moment you need directions is the moment you will not have signal.

WhatsApp is not optional

This is the part Americans consistently underestimate.

In Brazil, WhatsApp is the phone. It is how a pousada confirms your booking, how a guide tells you he is running twenty minutes late, how a driver finds you, how a tour operator answers a question you emailed three days ago and never got a reply to.

Install it before you fly and register it on your US number, which is easier to do at home than abroad. Once it is registered on that number it keeps working on wifi and on your eSIM data.

Two practical notes. Brazilians send voice notes constantly, including for things an American would type. And a business that ignores email will frequently answer WhatsApp within the hour, so if you are getting silence from somewhere you want to book, that is usually why.

What actually goes wrong

Arriving with no data and no plan. Airport wifi requires a registration you cannot complete without data. This is a genuinely annoying loop.

Leaving roaming on with the US carrier while also using an eSIM, which quietly bills you for both. Turn off data roaming for your US line once the eSIM is running.

Assuming the hotel has usable wifi. In cities it is fine. At a beach pousada or a lodge it can be one shared connection for forty people, and it will not carry a video call.