Japan connectivity usually rides Docomo, SoftBank, au KDDI, or Rakuten Mobile networks. Most travel SIMs/eSIMs lean on Docomo or SoftBank coverage.

Formats

  • Physical SIM — widest handset support
  • eSIM — no swap; install on Wi-Fi before departure
  • Pocket Wi-Fi — group sharing, extra device
  • Home roaming — simplest, usually priciest

How to choose

Match days, hotspot needs, and whether you must keep a Taiwan number for OTP SMS. Compare DJB Japan eSIM/SIM day packs against other high-value unlimited-style options before you buy.