One eSIM for Brazil, Argentina and Chile

Three borders, and only two of them work

A traveller doing the classic southern loop assumes the rule follows the bloc. Brazil, Argentina, Paraguay and Uruguay are Mercosur; Chile is an associate, not a full member. So the charge should vanish inside the bloc and survive at the Chilean border.

It is the opposite.

The border that works is the Brazilian–Chilean one, and it works because of a bilateral free trade agreement that has nothing to do with Mercosur. The borders that still cost money are the Mercosur ones.

Chile is the hinge. It is the only country on this route whose roaming charge has dropped against both of its neighbours here — and it got there through two separate bilateral arrangements, not through the bloc.

It is the same shape as the entry rules: each leg follows its own bilateral history, not the bloc. Whether Brazil wants a visa from you is decided the same way — country by country, on reciprocity.

Why the Chile rule applies and the Mercosur one does not

Both are real treaties. Both are in force. They differ in a single structural detail, and that detail is the whole story.

The Brazil–Chile agreement sets its own clock. Article 11.25 gives the parties one year from entry into force to eliminate the surcharge, and names the two regulators — Anatel and Chile's Subtel — to coordinate implementation. Anatel's own reasoning, in January 2023, used the decisive phrase: it considered there to be direct applicability of the roaming obligations in the Brazil–Chile agreement. Nothing else had to happen. Chile asked for a six-month extension, got it, and the rule took effect on July 25, 2023.

The Mercosur agreement does the opposite. Article 6 creates a Technical Coordination Committee and gives it the job of enabling implementation — and in doing so, the Committee shall determine the effective date of application of the Agreement among the States Parties that have ratified it. Article 6 also says the Committee begins its work at the moment of entry into force. So entry into force starts the committee, and the committee starts the rule.

That is why ratification headlines are misleading here. Uruguay approved it in 2020, Paraguay in October 2023, and Brazil deposited its instrument so that the agreement entered into force for Brazil on November 21, 2025. Every one of those is true. None of them switches the charge off.

The announcement that has been made twice and withdrawn twice

This is where English-language sources go wrong, and it is worth knowing because it will probably happen again.

In December 2024, Argentina's ENACOM published that from Sunday the 29th, Argentines travelling to Mercosur countries would stop paying for international roaming. It was withdrawn within hours. The page is gone — the URL still answers, but what comes back is an error page reading the requested URL could not be obtained.

Then in January 2026, the Brazilian federal government announced the end of the charge on social media. Anatel contradicted it the next day, saying no deadline had been set.

Two announcements, two retractions, in thirteen months. Any article written in the window after either one — and there were many — describes a rule that was never applied. If you are reading a source that says roaming between Brazil and Argentina is free, check whether it was published in late December 2024 or late January 2026.

What the carriers are still selling

Declarations can be wrong in both directions. Commercial conduct is harder to fake: a carrier does not keep selling something it is forbidden to charge for.

On September 2, 2026, all three Brazilian carriers were still selling paid roaming packages whose country lists include Argentina, Paraguay and Uruguay.

Two caveats keep this honest. First, Chile appears in those same country lists — being in the list is not proof of a charge, since the package also carries countries where none applies. Second, the carriers embed roaming in premium plans: Claro includes Passaporte Américas in its larger postpaid tiers, TIM Black carries an Américas allowance, and Vivo bundles travel data into Vivo Total. A traveller on one of those plans may cross into Argentina and pay nothing extra — because of their plan, not because of a treaty.

None of this touches a foreign carrier's own plan. Verizon, AT&T and T-Mobile price Brazil the same way they price Argentina and Chile, and their day rates are indifferent to any of these treaties — that comparison has its own guide.

And on the Chile leg there is a limit almost nobody publishes in English. The benefit runs for 90 consecutive days, or 120 non-consecutive days in the same calendar year. That figure is not in either treaty; it comes from the operational manual Anatel approved to implement Article 11.25. Claro also states that prepaid and controle customers must migrate to postpaid to use international roaming at all.

What a regional eSIM does and does not carry

Given all that, the regional eSIM stops being a price optimisation and becomes a way to opt out of three legal regimes at once. One profile, one rule, three countries.

Both major resellers sell one. Holafly's Latin America plan lists eighteen countries including Brazil, Argentina and Chile; Airalo's lists seventeen. Airalo publishes an unlimited ladder from $19.50 for 3 days to $97.00 for 30; Holafly's runs from $19.90 to $97.90 — close enough that the choice is not really about price.

What neither publishes is the thing that decides whether it works: which network the profile actually uses in each country. Coverage in Brazil, Argentina and Chile is not uniform between carriers, and a regional profile that lands on a weak partner network in one country will feel broken there while working elsewhere. Holafly's own coverage language is a hedge — excellent in urban areas, weaker or unstable in deserts, mountains or jungle.

The second limit is structural: the regional plans are data only. Holafly says its Latin America product does not include a local phone number for calls or texts. If something on the trip needs an SMS to a local number — a bank, a rental counter, a ride app verification — the eSIM will not receive it. That also rules out the Brazilian payment rail: PIX for a visitor runs through a bank app, and the enrolment it depends on assumes a number that can receive a code.

If you decide to buy a local prepaid line instead, both neighbours now require registration, and both accept a passport. Argentina requires every mobile line, new or existing, to be registered to the holder's ID, and since March 2025 activation asks for the ID number, the document sequence number and the sex printed on it; ENACOM answers the foreigner's question directly, confirming a passport can be used. Chile went further on August 20, 2026: every existing prepaid number must now be tied to an identity, with ten days to complete validation before the line stops accepting top-ups. That deadline came from a Subtel resolution, not from the law itself — the law created the duty, the resolution set the date.

Brazil's version of that counter question is different again, and it turns on a tax number rather than an identity document: getting a SIM card in Brazil covers what is actually required, and what a CPF is covers why it keeps being asked for. For choosing an eSIM for Brazil alone, the four checks that decide it are here. And once you have a number in hand, reading a Brazilian phone number explains the two digits in the middle that belong to nobody.

Sources

• Decree 12.782/2025, promulgating the Mercosur roaming agreement — Article 6, on the Technical Coordination Committee and the effective application date. Accessed September 2, 2026.
• Decree 10.949/2022, promulgating the 64th Additional Protocol to ACE 35, which incorporates the Brazil–Chile free trade agreement — Article 11.25. Accessed September 2, 2026.
• Anatel on the start of the Brazil–Chile rule, July 2023 — the July 25 start date and the 90/120-day limit, via the Internet Archive. Accessed September 2, 2026.
• ENACOM, December 2024, the withdrawn announcement, via the Internet Archive; and ENACOM on prepaid registration, where the passport question is answered. Accessed September 2, 2026.
• Subtel on Chile's prepaid registration deadline of August 20, 2026, and Law 21.729, which created Article 26 quater. Accessed September 2, 2026.
• Paraguay Law 7.173 of October 16, 2023 and Uruguay Law 19.897 of August 28, 2020, approving the Mercosur agreement. Accessed September 2, 2026.
• Carrier roaming pages: Claro, TIM and Vivo. Read September 2, 2026.
• Regional eSIM product pages: Holafly and Airalo. Read September 2, 2026.

What we could not verify

• Which network each regional eSIM uses in Brazil, Argentina and Chile. Neither Holafly nor Airalo publishes the host network per country, and it is the single fact that most determines whether the profile works where you are standing.
• When the Mercosur committee will set the application date. No published act names one. We searched the Brazilian official gazette from December 2025 through September 2026 for the agreement's own terms and found nothing beyond the promulgating decree.
• Anatel's live pages could not be read at source. The regulator's portal removed part of its content on July 4, 2026 under electoral-period restrictions. The Anatel material cited here was recovered from the Internet Archive, and the dates are the dates of original publication.