Chile is on the Americas plan, so the same eSIM works in Santiago, Valparaíso, San Pedro de Atacama and Puerto Natales without anything to change. Coverage follows the towns, as it does on every network. In the Atacama that means signal in San Pedro and little on the salt flats and high lagoons; in the south, the 1,240 km of the Carretera Austral and the trails of Torres del Paine have long silent stretches.
Argentina, Bolivia and Peru share the package, which suits the way people cross this corner of the continent: over the Andes to Mendoza, from Puerto Natales to El Calafate, by jeep from San Pedro to Uyuni. The phone switches to a local network after each border. Winter weather sometimes closes the Los Libertadores pass to Mendoza between June and September, and the desert does not do second chances: download before you go.