SA
Sakura Mobile
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be careful of buying SIM online
I got my SIM card at Kansai Airport (KIX), the staff was really kind, they can speak English. A reminder is that the online registered SIM has no phone number, only has data for internet access. If you want to get a SIM with a phone number, you have to buy it in-person at the airport. I need a phone number for work, but if you are tourists, a SIM with just data is enough, go buy it online beforehand. I bought the wrong SIM but luckily got fully refunded. Thanks a lot for supporting me