The Suica card—and its counterparts like Pasmo and Icoca—is accepted almost everywhere in Japan as a "one-touch" payment method. Primarily, it is used for transportation, covering nearly all local trains, subways, and buses in major cities like Tokyo, Osaka, Kyoto, and beyond (though it cannot be used for the Shinkansen unless specifically linked). Beyond transit, Suica is a massive retail tool; it is accepted at almost all convenience stores (7-Eleven, Lawson, FamilyMart), vending machines, many chain restaurants (like Matsuya or Starbucks), and drugstores. You can also use it for coin lockers at stations and at many "Ekinaka" (inside-station) shops. In 2026, its interoperability is universal, so a Suica card bought in Tokyo works perfectly in the Kansai or Hokkaido regions. For tourists, having it on an iPhone or Apple Watch is the ultimate convenience, as it can be topped up via Apple Pay without needing to find a physical kiosk or use cash.