How to Read a Brazilian Phone Number

What the digits are

Four pieces, and only two belong to the person you are calling.

The country code is 55. Then the Código Nacional, which Brazilians call the DDD — a geographic area code of exactly two digits, always; Brazil has no three-digit one. Then the subscriber's number: nine digits on a mobile, eight on a landline.

A business card with a nine-digit number above an eight-digit one is a mobile above a landline, not a typo. It is also why an international form expecting one fixed length rejects a Brazilian number.

Do all Brazilian mobiles start with 9?

In circulation, yes. As a rule, no — and both claims are online.

Article 12 of the regulation in force reserves three digits, not one: "7", "8" and "9" open a nine-digit personal mobile number. Reserving a range is not issuing numbers out of it. So all Brazilian mobile numbers start with 9 describes what exists, not what the rule says.

This is not an old source contradicting a new one. In the eight-digit format, Brazilian mobiles already began with "9, 8, 7 or 6" — Anatel's own words, in its 2015 filing to the ITU. The ninth digit is what put a 9 in front of everything; the wider reservation came later, in 2022.

One eight-digit number does open with 7 and is not a cellphone: mobile radio service kept the old length and the 7XXX-XXXX shape.

Why the ninth digit exists, and what it broke

Numbers ran out. Anatel told the ITU in 2014 that the plan was changing "due to the increasing demand for new numbers".

It arrived area code by area code: São Paulo, area code 11, went first on 29 July 2012, and the south and centre-west were scheduled for 2016. Landlines were left out and still carry eight digits.

Hence the trap in an old address book: a Brazilian mobile written down with eight digits reaches nobody now. The 9 at the front is missing.

The rule that ordered it, Resolution 553/2010, is still cited by nearly every English page on the subject. It was repealed by the 2022 regulation, in force since 3 October 2022. The ninth digit did not disappear with it — the citation did.

The zero, and the two digits that belong to nobody

A number printed as 0 21 11 3333-4444 is not a fifteen-digit phone number. It is a phone number with two instructions stacked in front.

The "0" is the National Prefix, marking the call as national long distance. The two digits after it are the Código de Seleção de Prestadora — the carrier selection code, naming which company carries that long-distance call. Claro publishes 21 on its visitor page; TIM publishes that its prepaid unlimited calls apply only when its own code, 41, is dialled in front.

The long-distance carrier is not a billing arrangement here, it is something you type. The regulation allows a short form too — prefix, area code, number — routed through a carrier chosen in advance.

None of it is part of the number. Copy a poster verbatim into your contacts and you save somebody else's routing preference with it.

How to dial it, and the shortcut written for visitors

From a Brazilian mobile to a number in the same registration area, dial just the number; outside it, the prefix and the area code, with or without the carrier digits. That is article 26 — articles 22 and 23, quoted by most summaries, are the landline procedure. From abroad it is your international access code, then 55, then the area code, then the number: from the United States, 011 55 11 9XXXX-XXXX.

Then the part almost nobody knows. The regulation has a chapter headed international visiting users, whose single article lets a visitor dial "+", the country code, the area code and the number — expressly as an alternative to the domestic procedure. Brazil's own rule permits the format your phone already uses.

So save every number as +55, area code, number: the zero and the carrier code stop being your problem. The same shape is what a Brazilian payment key uses when it is a phone number, though there the visitor's obstacle is a tax registration, not the digits.

Three-digit codes beginning with 1 take none of it: Public Utility Services, each unique across the whole national territory by rule, which is why the emergency numbers do not change from city to city.

Getting a number of your own runs on a different rulebook — documents rather than digits: buying and registering a prepaid SIM.

Sources

• Anatel — Resolution 749/2022, the numbering regulation: articles 10 to 14 on lengths, 22 to 26 on dialling, 29 on visitors (accessed August 27, 2026)
• Anatel — Resolution 553/2010, the ninth-digit rule, marked repealed in its title (accessed August 27, 2026)
• ITU — Brazil, country code +55: Anatel's filings of 2014 and 2015, with the mobile and fixed tables (accessed August 27, 2026)
• Claro — International Visitors, on how a carrier tells a visitor to dial (accessed August 27, 2026)
• TIM — prepaid plans, São Paulo, on the code its unlimited calls require (accessed August 27, 2026)

Method on how we research; author Jeff Bruno, in Curitiba. Neighbours: phones and internet, money and payments, all guides.

What we could not verify

• Whether any number in service begins with 7 or 8. Article 12 reserves those digits, and a reserved range is not an issued one. The ranges themselves are designated in Anatel acts we did not open.
• Which three-digit numbers exist, and what each is. The regulation says only that Anatel designates them in separate acts, which we did not read.
• Whether the 2016 stages landed on schedule. Anatel's 2015 filing writes them in the future tense, and the same table lists area code 79 twice, under Bahia and under Sergipe.