Hi All,
From my recent experience, I bought a Softbank USIM card for an used
Softbank phone for about 3500 yen.
When my wife was talking to the shop clerk the first time he suggested to
buy a new phone because it's cheaper but we refused. The clerk said we have
to "register" our used phone to make it work with the new USIM card. But I
pull out my own Softbank phone and put another USIM card from my sons phone
and it all worked perfectly but the clerk suggested us to buy USIM when we
already have the actual phone. My wife decided to follow the procedure and
when I got the used phone she went to the shop and "registered" the phone
and bough a new USIM. The "registration/activation" was free, USIM with
White Plan + email plan but without special flat data plan (~4500yen)
because the used phone was not a smart phone. I guess if you bring a
smartphone then you have to buy a special Flat-rate data plan to protect
youself from huge bills for data packets. That is the only reason to bring
the phone to shop and buy SIM card with the relevant data plan.
Regards,
Yura