Buenos Aires: Major providers offer robust 4G and LTE coverage across the capital's metropolitan area, including popular neighborhoods like Palermo, Recoleta, and San Telmo. 5G is expanding but not yet universal. The Subte (subway) system has good signal on most platforms, but connections can be intermittent while trains are moving through deeper tunnels. Indoor coverage in older buildings with thick walls can sometimes be less reliable.

Córdoba: Argentina's second-largest city boasts solid 4G coverage throughout its urban core and student-filled districts like Nueva Córdoba. Signal remains consistent in the historic center and popular Güemes neighborhood. Coverage can become less predictable as you travel into the nearby Sierras Chicas mountain range, so it is best to download maps beforehand.

Rosario: You will find dependable 4G and LTE connectivity throughout the city center and along the popular Paraná River waterfront. Signal strength is generally high in key areas like the National Flag Memorial and the Oroño Boulevard. Indoor reception in some of the dense central apartment blocks may occasionally be weaker, but overall performance is strong.

Mendoza: The city of Mendoza itself has reliable 4G coverage, perfect for navigating the downtown area. As you venture out to the surrounding wine regions like Luján de Cuyo or the Uco Valley, service can become intermittent. Most major wineries (bodegas) have good signal and Wi-Fi, but you may lose connection while traveling between them in more rural areas.

San Carlos de Bariloche: The main town center enjoys good 4G service, particularly around the Centro Cívico and the Nahuel Huapi Lake shoreline. However, as soon as you venture onto hiking trails in the surrounding Nahuel Huapi National Park or drive scenic routes, cell signal can become patchy or disappear completely. Plan for offline access when heading into the mountains.

National Routes: Coverage is generally strong along the high-traffic corridors like RN 9 (Buenos Aires-Rosario-Córdoba) and RN 7 (to Mendoza). However, expect frequent and prolonged signal loss on RN 3 through Patagonia and the iconic RN 40, which runs parallel to the Andes, where service is often only available in towns.

Trenes Argentinos (Long Distance): On major train routes from Buenos Aires to cities like Mar del Plata, Rosario, and Córdoba, connectivity is mostly stable. The signal can become intermittent or drop entirely when the train passes through vast rural and agricultural zones between urban centers.

Andean Mountain Passes: Mobile service is non-existent when crossing high-altitude Andean passes. The main crossing to Chile, Paso Internacional Los Libertadores on RN 7, loses all signal on the steep mountain approaches and inside the Cristo Redentor international tunnel.

Major Tunnels and River Crossings: Expect to lose your connection inside long tunnels, such as the Túnel Subfluvial connecting Santa Fe and Paraná. Signal can also be unstable on large bridge systems like the Zárate-Brazo Largo Complex crossing the Paraná River delta.

Patagonia and Puna Regions: Be prepared for vast areas with no mobile service in remote regions. Large stretches of central Patagonia, particularly in the provinces of Chubut and Santa Cruz, and the high-altitude Puna de Atacama desert in the northwest have coverage only in and around populated towns.