Warsaw: You'll find excellent 4G and 5G coverage throughout the capital, from the bustling city center and business districts to the historic Old Town. The Warsaw Metro (Metro Warszawskie) offers reliable connectivity on most platforms and inside trains, though you might experience brief drop-outs between some of the deeper stations on the older M1 line. Indoor coverage is strong, but signals can weaken inside older, thick-walled buildings in districts like Praga.

Kraków: Mobile coverage is consistently strong across Kraków's most popular areas, including the Main Market Square, Wawel Castle, and the historic Kazimierz district. As the city's tram system operates entirely above ground, your connection remains stable while traveling. Be aware that the many unique underground cellars and basement bars in the Old Town often have very limited or no mobile signal due to their thick stone walls.

Gdańsk: Expect reliable 4G and growing 5G service across Gdańsk and the wider Tricity (Trójmiasto) area, including Sopot and Gdynia. Connectivity is excellent in the tourist-heavy Main Town and along the Motława river. The SKM urban rail system, which connects the three cities, provides a stable connection as it runs almost entirely at ground level or on elevated tracks.

Wrocław: This vibrant city boasts comprehensive 4G/LTE and expanding 5G coverage. You'll have a strong, dependable signal in key tourist spots like the Market Square, Cathedral Island (Ostrów Tumski), and around the university. The city's transport is primarily an overground tram network, so your connection will not be interrupted while you move around. Indoor reception is generally very good, though some older, large buildings may have weaker spots deep inside.

Major motorways and expressways: Coverage is generally reliable along key transport arteries like the A1 (north-south), A2 (east-west), and A4 motorways, as well as major expressways like the S7 and S8. However, signal can weaken or temporarily drop in less populated sections, particularly when passing through dense forests such as the Tuchola Forest.

PKP Intercity trains: Connectivity on Polish railways varies. On high-speed Express InterCity Premium (EIP) routes between major cities like Warsaw, Kraków, and Gdańsk, the signal is mostly stable, though on-board Wi-Fi can be a better option. On slower InterCity (IC) or TLK trains, especially those crossing rural areas in eastern Poland, expect intermittent signal and periods with no service.

Mountain regions: Mobile signal is significantly reduced in the mountainous south. In the Tatra Mountains near Zakopane and the remote Bieszczady Mountains in the southeast, coverage is often limited to towns and main roads. Once you are in valleys or on hiking trails within national parks, do not expect a consistent connection.

Road tunnels: While Poland has few very long road tunnels, key ones like the tunnel under the Vistula River in Gdańsk or the new tunnel on the S7 expressway south of Kraków can cause complete signal loss. Service typically resumes immediately upon exiting, but do not rely on a connection while inside.

Forests and Lake Districts: Vast, sparsely populated areas like the Masurian Lake District (Mazury) and the primeval Białowieża Forest are notorious for patchy coverage. While main towns have service, driving on local roads, boating on lakes, or hiking can result in long periods with no signal from any operator.