Orange, Play, Plus and T-Mobile cover cities and A-road highways on 4G and 5G; Bieszczady forest trails, Masurian lake interiors and Sudetes hiking ridges can thin out. Warsaw metro has underground coverage on major lines. Check the network list above for Poland before you fly; it shows what is available right now, including options such as Plus.
There is no complicated Poland-only product to learn. NXTL is one global eSIM: the same profile you might use elsewhere works here on Plus when listed. Land, turn data on, and go — rates for Poland are shown live on this page because they can change.
EU roaming applies for many visitors; others buy prepaid at Żabka, airports and operator shops with passport ID. Złoty-priced data is affordable for week-long city hops. That still makes sense if you will live in Warsaw for months and need local calls. For a holiday or short work trip, most people only need data — and NXTL gives you that without the desk stop: install at home, keep your usual number for calls and bank texts, pay only for the gigabytes you use.
If Poland is one stop on a longer route, NXTL is built for that. Use data around Warsaw and Kraków, then keep the same balance wherever NXTL has coverage next. You are not locked into a single-country tourist pack.
PKP intercity trains between Warsaw and Gdańsk pass through rural Pomerania where one Polish carrier may hold LTE longer in the same carriage. NXTL is built for that kind of Poland trip: data when you need it, without buying a new pack for every change of plan.