Jambo! Narita is an hour from Tokyo, so you need data before you even reach the city. Install a JamboSim eSIM before you fly and land already connected.
Free airport Wi-Fi exists, but train apps and IC card top-ups are far easier on your own data.
Narita Express reaches Tokyo Station in about 60 minutes; Keisei Skyliner runs to Ueno in 45.
NRT has Terminal 1, 2 and 3, connected by free shuttle buses. Local time is JST (UTC+9).
Skyliner / Keisei or Narita Express
Yes, your phone connects to a Japanese network right after landing.
Yes, coverage spans Japan, including most bullet train routes.
Install before departure and activate on arrival.
