Before you start

An unlocked or eSIM-capable handset
Passport for SIM registration
PESEL, a Polish address and a bank account for a postpaid contract
Landlord or building administrator consent for a fixed-line installation

Step-by-step

1
Buy and register a prepaid SIM
Operator shops, kiosks and supermarkets all sell them, and registration against your passport happens at the counter. An unregistered SIM is deactivated within days.
In personWho: YouPLN 5–30 including starter credit
2
Use EU roaming while you decide
If you arrive from another EU country your existing SIM works at home rates under roam-like-at-home. There is no urgency and no reason to buy at the airport.
OnlineWho: You
3
Ask the building, not the coverage map
In Nikiszowiec, Giszowiec, Załęże and the older parts of Bytom and Zabrze, ask the administrator which operators are wired into the stairwell. Protected historic estates in particular cannot simply have new cable run up the facade.
In personWho: YouBefore signing a lease
4
Order the installation early
Where fibre exists, installation runs one to three weeks and usually needs an engineer plus the administrator's permission for any new cabling. Start it the week you sign, not the week you move.
OnlineWho: You
5
Keep a mobile router as the fallback
5G coverage across the conurbation is dense — it is one of the most continuously built-up areas in Europe — and unlimited-data plans are cheap. If your building turns out to be a copper one, a router on a mobile plan is a legitimate permanent answer.
OnlineWho: You

Documents you’ll need

Passport for SIM registration
PESEL and Polish bank account, for postpaid
Lease or written landlord consent, for a fixed-line installation
Proof of address, for some contracts

Things most newcomers don’t know

A heritage-listed miners' estate is a beautiful place to live and a bad place to assume fibre.

Nikiszowiec and Giszowiec are protected monuments, which constrains what can be attached to or drilled through the fabric. Renovated buildings there often have modern connections; neighbouring ones on the same courtyard may not, and the operator's checker answers at street level and therefore answers the wrong question. Ask the administrator what is in the stairwell.

Source: community-reported

There is no anonymous prepaid market in Poland.

Polish telecommunications law requires every SIM, prepaid included, to be registered to an identified person. There is no way to buy one for cash without documents, and one sold without proper registration is deactivated. Bring a passport to the kiosk instead of expecting to sort it out later.

Source: Polish telecommunications law

The conurbation's density makes 5G a real fixed-line substitute.

Twenty-odd contiguous towns of a couple of hundred thousand each means mast density that a sprawling city of the same total population would not have. For a single-occupancy flat an unlimited 5G router is a genuine alternative rather than a compromise — and it removes any dependency on a landlord, an administrator and an engineer cooperating in the same month.

Source: community-reported, consistent with EU price comparisons

Port the number from the new operator; never cancel the old contract first.

Polish number portability is quick and free, but it only works while the outgoing contract is live. Terminating first releases the number and it is no longer yours to move. Start the process at the new operator, who then handles the termination as part of the transfer.

Source: UKE — Office of Electronic Communications