Brussels: As the capital, Brussels boasts excellent 4G and 5G coverage across all its 19 municipalities, particularly in the central tourist districts around the Grand-Place. The STIB/MIVB metro system is a standout, offering strong and continuous cellular signal on platforms and even between stations in the tunnels, making navigation easy.

Antwerp: You'll find a reliable, high-speed connection throughout Antwerp's city center, from the Central Station to the historic Grote Markt. Coverage on the city's 'premetro' system-where trams go underground-is generally good on the platforms, but the signal can be less consistent while moving through the tunnels.

Ghent: Connectivity is superb in Ghent's compact and walkable historic center. The city relies on an above-ground tram and bus network, which means you can expect an uninterrupted mobile signal while using public transport to travel between key sights like the Gravensteen castle and Saint Bavo's Cathedral.

Bruges: The dense medieval center of Bruges is well-covered with strong 4G and 5G signals, essential for navigating its winding streets. While outdoor coverage is excellent, the very thick stone walls of some historic hotels and restaurants can occasionally weaken the signal indoors.

Liege: Expect solid and dependable network performance in the central core of Liege, especially along the Meuse river and in the commercial heart around Place Saint-Lambert. The city's hilly topography means signal strength is best in the central valley and can vary slightly in the more elevated residential neighborhoods.

Major Motorways: Coverage along the primary motorway network, including the E40 (coast to Brussels to Liège), E19 (Brussels-Antwerp), and E411 (Brussels-Ardennes), is generally very strong and reliable. In the densely populated regions of Flanders and Brussels, you can expect continuous 4G/5G signal. Service can become less consistent on sections of the E411 and E25 as they pass through the hilly, forested Ardennes region.

NMBS/SNCB Intercity Trains: The Belgian rail network maintains excellent connectivity on major Intercity (IC) routes, especially between Brussels, Antwerp, Ghent, and Bruges. Signal is strong in and around stations. Expect brief signal drops when passing through some rural areas or inside older tunnels, particularly on lines heading south-east from Brussels towards Luxembourg.

The Ardennes: While not mountainous, this hilly and forested region in southern Wallonia is where you are most likely to experience signal loss. Coverage is generally good within towns but can be intermittent or drop completely on smaller regional roads (N-roads) that wind through deep valleys and dense forests between population centers.

Major Tunnels: Key urban road and rail tunnels, such as the Kennedy Tunnel (E17) in Antwerp and the main tunnels of the Brussels Ring (R0), are typically equipped with cellular repeaters, providing uninterrupted service. However, shorter or more rural tunnels may lack this infrastructure, leading to a temporary loss of signal until you exit.

Nature Reserves: The most significant coverage gaps are found in sparsely populated nature reserves. Areas like the High Fens (Hautes Fagnes) plateau near the German border and remote parts of the Gaume region have known dead zones where mobile signal from all providers can be weak or non-existent outside of small villages.