Which SIM mobile brand to choose?

Hello Everyone!

I will be staing on ISHIGAKI island in October, and I have a question about Mobile Brand. I know there a lot of brands, f.ex. JetPac, NinjaWifi, Docomo, Au… etc
So…
Which has the best network & area?
And which should I avoid, because they don't have proper infrastructure…?

by InzMrooz

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