EDIT:
Dear all, unless you have a Japanese phone to help you activate the line. Now the helpdesk will charge 2500 yen for activation.
It’s recommended that you can get visitor SIM
Details are over here
/Can
27th Sept 2012
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Dear all,
Attached are these guides on how to purchase b-mobile Card.
Please use these guides at your own risk!
learnjapanese.sg 
Hello!
I’m so glad I had found this awesome guide on the purchase. Thank you very much! (*^^*)
Are you able to let me know if this b-mobile u300 can works on any iPhone 4? Or my iPhone needs to be unlocked/jailbroken? Lastly by unlimited it meant I can surf the Internet constantly without additional charge for the first 10 days?
どうもありがとうございます！