In 2026, you do not "buy" a Mobile Suica card at a physical counter; instead, you "issue" it directly on your smartphone. For iPhone users, you go to the Apple Wallet app, tap the "+" icon, select "Transit Card," and search for "Suica." You can then add funds using any credit card already in your Apple Pay (Note: Visa can sometimes be finicky, so Mastercard or Amex are preferred). For Android users, the process is similar via Google Wallet, but it generally requires a phone purchased in Japan that supports "Osaifu-Keitai" technology, though some newer global models have expanded compatibility. If you prefer a physical card first and want to "transfer" it to your phone, you can buy a regular Suica at any JR East station or airport in Tokyo and then use the Suica app to scan the card, which moves the balance to your digital wallet and deactivates the plastic card. The mobile version is highly recommended as it allows for easy "top-ups" anywhere and works even if your phone battery is critically low or the screen is locked, making it the most efficient way to navigate Japan's trains and buses.