Staying Connected in Japan

An eSIM, if your phone supports it (most iPhones since the XS and most Android flagships since 2021). It installs before you leave home, activates automatically when you land, and skips any airport counter or pickup locker entirely.

Your phone needs to be carrier-unlocked to install a second eSIM profile alongside your home carrier plan. Most US phones bought outright or paid off are unlocked; check with your carrier if unsure before you travel.

For typical use, maps navigation, messaging, and some photo uploads, 1-3GB per week is usually enough. Heavy streaming or hotspotting other devices pushes that to 5-10GB per week.

Most tourist eSIMs are data-only. For calls, use WiFi-based apps (WhatsApp, FaceTime, LINE) over the data connection, or check whether your specific eSIM plan includes a Japanese phone number with voice minutes.

For groups of 2 or more sharing one connection, a pocket WiFi rental is usually cheaper per person than buying individual SIMs, since the daily rate ($6-10) is split across everyone's devices.

Major eSIM providers in Japan resell coverage from NTT Docomo, SoftBank, or au, all of which have strong coverage on shinkansen lines and in most rural areas. Coverage can drop briefly in mountain tunnels and very remote areas like parts of rural Hokkaido.

Each eSIM plan covers one device only, so if you're each bringing your own phone, you each need your own eSIM. Couples and families who want to share a single connection instead usually rent one pocket WiFi device, which supports multiple devices at once.

Only as a stopgap. Free WiFi at Narita, Haneda, and Kansai covers the arrivals hall so you can check messages, but it doesn't extend past the terminal and isn't reliable enough for real-time maps and navigation once you're on the train or in the city. Set up your eSIM, SIM, or pocket WiFi before you land instead.