Roafly
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Roafly is a London-based eSIM provider that partners with NTT Docomo in Japan, giving you strong coverage including rural areas and subway tunnels. They offer flexible plans ranging from 1GB to 20GB with durations from 7 to 30 days, starting at $3.90. The service includes 24/7 WhatsApp support for any issues while traveling.
Roafly works well if you want affordable data without long-term commitments, with the ability to top up on demand if you run low. It's best for travelers who value multilingual customer support and don't mind activating an eSIM a few days before departure to ensure it works correctly.