[Q] Using Softbank Pocketwifi USim in Oneplus One topic

First of all. I live in Japan and I pay for Unlimited Data on my Pocket Wifi I want to take the USIM out of that to use it in my phone. Is there any way I can do this? I put the USIM In my OnePlus and I get 'service' but no Data. I've used the search feature on the forums with no luck. Thank you!