Before you start

Photo identification — Portuguese law requires every SIM, prepaid included, to be registered
An unlocked handset or an eSIM-capable device
A NIF and usually a Portuguese IBAN, for a postpaid plan or a fibre bundle
A Portuguese address, for fibre

Step-by-step

1
Start prepaid with a passport
MEO, NOS and Vodafone all sell prepaid SIMs in Faro's shopping centres and at the airport, and the low-cost brands — Moche, WTF, Yorn, Uzo — run on the same networks for less. No NIF and no bank account needed. A Portuguese SIM also roams across the EU at no extra cost, which matters if you cross to Spain regularly.
In personWho: YouDay 1
2
Move to postpaid once you have a NIF and an IBAN
Contracts are cheaper per gigabyte and can bundle home internet and television, but they require the tax number and normally a Portuguese direct debit. This is another reason the NIF-then-bank sequence matters.
OnlineWho: You
3
Ask who holds the internet contract before you sign a lease
In a property that is let to tourists for part of the year, the fibre is frequently in the owner's name and included in the rent, or is a service the owner disconnects between seasons. Establish whether you are inheriting a working line, taking over a contract, or ordering a new installation — and if your income depends on the connection, make it a condition of signing.
In personWho: You and your landlord
4
Check coverage where you actually intend to live
Faro, the coast strip and the main towns have strong 4G and 5G. The Serra do Caldeirão and the interior valleys behind the coast thin out noticeably, and fibre availability inland is patchy. If you are tempted by a cheap house in the hills, check the specific address rather than the regional map.
OnlineWho: You
5
Order fibre early — installation takes weeks
Portuguese fibre is fast and inexpensive by European standards, but an engineer visit is normally required and lead times run two to four weeks. In an older Faro building, ask whether fibre reaches the flat itself or stops in the entrance hall.
OnlineWho: You
6
Keep the number when you switch
Portugal operates mobile number portability and the process is straightforward. Never cancel the old contract before the transfer completes, or you lose the number.
OnlineWho: You

Documents you’ll need

Passport or national ID, required to register any SIM
NIF and Portuguese IBAN, for postpaid and fibre
Proof of address, for fibre installation
Landlord permission, where an installation requires work to the building

Things most newcomers don’t know

Every SIM in Portugal must be registered to an identity document, prepaid included.

There is no anonymous prepaid market here. You will be asked for a passport or ID at the counter, and a SIM bought without registration will not activate. This is unremarkable once you know it, and mildly infuriating if you assumed you could pick one up at a kiosk on arrival with cash.

Source: ANACOM / Portuguese telecoms regulation

In a seasonally let property, the internet contract is often not yours and may not be continuous.

A flat that is a holiday rental in July and a winter let in January frequently has the fibre in the owner's name, bundled into the rent, or suspended out of season. Remote workers sign a cheap winter let, arrive, and find the line inactive or the router removed. Ask specifically: is there an active fibre line, whose name is it in, and does it stay on for the whole term? Put the answer in the contract.

Source: community-reported; regional letting practice

Coverage and fibre thin out fast once you leave the coast strip.

The Algarve's population, infrastructure and money are concentrated in a narrow band along the sea. Ten kilometres inland into the Barrocal and Serra, mobile coverage becomes patchy and fibre availability becomes address-specific rather than area-wide. The cheap rural property that makes the region look affordable is frequently the one where you cannot work. Check the exact address with the operator before committing.

Source: Operator coverage maps; community-reported

Low-cost brands run on the same three networks as their expensive parents.

Moche and WTF sit on NOS, Yorn on Vodafone, Uzo on MEO. Coverage is the parent network's coverage. Paying a flagship price buys bundled television, handset subsidies and customer service rather than better signal — which for a newcomer with an unlocked phone is usually not worth the difference.

Source: ANACOM operator structure

Common mistakes to avoid

Expecting to buy an anonymous prepaid SIM without showing identity documents.
Signing a seasonal let without establishing whether the fibre line is active, whose name it is in, and whether it stays on.
Taking a rural property on the strength of a regional coverage map rather than an address check.
Paying a flagship carrier price for coverage a low-cost brand supplies identically.
Cancelling an old contract before the number transfer completes.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.