Thank you for your quick support.
I'm also not sure about the Limitation.
How much the previous limit amount? How about the case of Kojima san?
I use my phone for calling domestic/overseas, tethering to my PC, using some application.
Which activity is taking most high cost?
If it cause by overseas cost, we may save the cost by registering discount calling service.
(ex. the number starts from 005+country code+ phone Number.)
Basically, almost of my contacts is located in overseas, it's better to register but I don't know how to do.
So hope you to follow this to save the expense.
Please confirm.