Antananarivo: As the capital, Antananarivo offers the most reliable mobile coverage in Madagascar. You'll find strong 4G/LTE signals in central districts like Analakely and the Haute-Ville (Upper Town). Connections remain stable along major thoroughfares, but can weaken inside older, thick-walled buildings or in the dense, hilly residential areas on the city's outskirts.

Toamasina: In Madagascar's primary port city, connectivity is concentrated around the bustling city center and the port facilities. 4G service is generally good for everyday use in these core areas. However, signal strength can become less consistent once you travel into the surrounding residential neighborhoods or within large industrial buildings.

Mahajanga: This popular west coast city provides decent 4G coverage in its central areas and along the famous seaside promenade, the "Bord". While you can expect a reliable connection for social media and maps in these tourist-frequented zones, the signal may become less stable in residential areas further from the city center.

Nosy Be: As a major tourist hotspot, the island's network is focused on key areas. You'll find good 4G/LTE performance in the main town of Hell-Ville and around popular beach resorts like Ambatoloaka. Be aware that venturing into the island's interior for nature reserves or to visit smaller villages will often result in a drop to 3G, 2G, or a complete loss of signal.

National Routes: On the main paved highways like the RN7 (Antananarivo to Toliara), RN2 (Antananarivo to Toamasina), and RN4 (Antananarivo to Mahajanga), you will find reliable signal within cities and larger towns. However, expect frequent and often lengthy signal drops in the rural and sparsely populated stretches between them.

Fianarantsoa-Côte Est Railway: This scenic train journey travels through dense eastern rainforests and is famous for its almost complete lack of mobile connectivity. Signal is extremely rare and should not be expected for the vast majority of the trip, with brief service possible only at a few station stops.

Central Highlands: Driving through the mountainous Central Highlands, especially along the winding sections of the RN7, results in highly intermittent service. Mobile signal is frequently lost in valleys and on remote stretches between towns like Antsirabe, Ambositra, and Fianarantsoa.

Western Madagascar (RN8): The route west toward Morondava and the unpaved roads used to access attractions like the Tsingy de Bemaraha National Park have extremely limited to non-existent coverage. Travelers should anticipate being completely offline for hours or days at a time in this region.

Deep South Routes: South of Isalo National Park, along the RN10 and RN13, the landscape becomes increasingly arid and remote. Mobile network coverage is very sparse and concentrated only in the few small towns along the way, with vast dead zones in between.