Does eSIM work in Japan? +
Yes, eSIM works excellently in Japan. The country has three major networks (Docomo, Softbank, AU) with 4G/5G coverage across all major cities, tourist spots, and transportation hubs including Shinkansen bullet trains.
What eSIM network does Japan use? +
Japan uses Docomo (NTT), Softbank, and AU (KDDI) networks. Most travel eSIM plans run on Softbank or Docomo for the widest coverage. Both support 4G LTE nationwide and 5G in major cities.
How much data do I need for Japan? +
For a 7-day trip: 5GB for light use (maps, messaging, social media). 10GB for moderate use (streaming, calls). 20GB+ if you plan to video call or stream Netflix daily. Many travelers find 10GB for 15 days to be the sweet spot.
Can I use Japan eSIM on Shinkansen? +
Yes. Japan's Shinkansen (bullet train) routes have excellent mobile coverage from Docomo and Softbank. You can stream music, use maps, and video chat during most of the journey — though some tunnels may briefly drop signal.
Is Japan eSIM better than pocket WiFi? +
eSIM is better for most travelers: no device to carry or charge, works directly in your phone, starts from $9 vs $8-15/day for pocket WiFi rental. The only advantage of pocket WiFi is sharing with multiple people — if you're traveling with family, pocket WiFi might be cheaper overall.