City break, road trip or a month away
A week in New York, with the subway, museums and a train down to Washington, fits in the 3 GB pack, which runs for 15 days. Most of that data goes on maps, transit apps and messaging, and hotel wifi covers the evenings.
Two weeks on the West Coast by car, from Los Angeles to San Francisco with stops in Las Vegas and the national parks, is a 5 GB or 10 GB trip: navigation runs all day and photos go up from the road. Both last 30 days. The 20 GB pack suits a month across several states or working remotely between motels. If the phone also shares its connection with a laptop or a second phone, go one size up. The data calculator works it out for your own route.