Honestly, before the trip, I didn't even think about buying a full-fledged SIM card; I thought the internet would be enough. But in reality, the Japanese number turned out to be incredibly useful, especially when I needed to reserve a table or confirm a visit. Once, I accidentally messed up the dates at a restaurant, and they were able to call me and clarify everything , without them, I would have simply missed out on dinner. I ordered a Japanese SIM card from Mobal , and the connection was great everywhere. It's a really cool feeling when you're not dependent on free Wi-Fi at hotels and can handle any issues on the go, as if you were staying there.