Andorra la Vella: The capital boasts excellent 4G and 5G coverage throughout its urban core, particularly along the main shopping artery of Avinguda Meritxell and within the historic Barri Antic. Indoor reception is strong in modern hotels and commercial centers, though signal can be weaker inside older buildings constructed with thick stone.

Escaldes-Engordany: Connectivity is seamless with its twin city, Andorra la Vella, offering robust 4G and 5G signals. Tourist hubs like the Caldea thermal spa complex and surrounding commercial districts have very reliable network performance, both indoors and outdoors.

Encamp: As a primary gateway to the Grandvalira ski area, the town itself has solid mobile coverage. The Funicamp cable car base is well-connected, and signal remains strong on the lower slopes and around major mountain restaurants. Coverage may become intermittent in more remote, high-altitude valleys of the ski resort.

La Massana: Expect dependable 4G coverage in the town center and around the base of the gondola that serves the Pal-Arinsal ski area. Once on the mountain, the main pistes and lift stations in both the Pal and Arinsal sectors are generally well-covered, though signal can drop in more isolated off-piste zones or deep valleys.

Sant Julià de Lòria: Located near the Spanish border, this town maintains strong and consistent network coverage, ensuring a stable connection as you enter or leave the country. Performance is reliable across its shopping areas and main transit routes.

Main road corridors: Coverage is generally strong along the primary CG-1, CG-2, and CG-3 roads that connect major towns like Andorra la Vella, Escaldes-Engordany, Encamp, and La Massana. However, signal can weaken temporarily in deep valley sections or sharp mountain curves between parishes.

Intercity rail: Andorra does not have a national railway system. Travelers arriving by train to nearby stations in France (L'Hospitalet-près-l'Andorre) or Spain will rely on road transport to enter the country, where mobile signal is acquired after crossing the border.

High mountain passes: Expect significant signal degradation or complete loss on high-altitude mountain passes. The Port d'Envalira (CG-2) has intermittent service, while secondary passes like the Coll d'Ordino often have no reliable signal, particularly during winter months when the road may be closed.

Major tunnels: Most of your journey through major road tunnels like the Túnel d'Envalira (on the CG-2) and the Túnel de les Dues Valires will have continuous mobile coverage thanks to installed repeaters. You may experience a very brief signal drop upon entering or exiting.

Nature parks and remote valleys: Cellular service is extremely limited or non-existent once you venture into protected areas like the Valls del Comapedrosa or Sorteny Valley Nature Parks. Hiking trails and remote areas away from ski resorts or villages are unlikely to have a usable signal.