What happens if I use a local USIM in Japan when I use all the data?

I used pocket Wi-Fi every time I went to Japan.

I'm worried because I heard that local USIM is much more convenient.

I tend to use a lot of data, but what happens if I use it as USIM?

Is it slow because it changes to 3g like in Korea?

Or is it completely blocked?

1145 2018-04-20 Lady

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