Coverage league tables shift constantly and differ by country, so rather than naming a winner, here's how to pick well anywhere. In most markets, the oldest or largest incumbent carrier has the widest rural and highway coverage, while challenger brands compete on price with strong city coverage but thinner networks outside urban areas.
Before buying, spend five minutes with independent coverage maps; crowd-sourced coverage websites and each carrier's own map let you check the specific beach towns or rural areas on your itinerary rather than relying on national averages.
A few practical notes: tourist SIMs from budget brands sometimes ride on a parent network with lower priority, meaning slower speeds at crowded times; 5G maps look impressive but LTE coverage is what matters for reliability outside city centers; and if you're heading somewhere genuinely remote, a second SIM on a different network is cheap redundancy that beats any single carrier's map.