I really don't know about that one. I don't use my blackberry while in JA - lesson learned after adding that AT&T international plan - every time an email came in or somebody called me - I was hit with roaming charges.
I think for you to add that SIM card to the BB while in JA it would have to first be unlocked - it doesn't matter if it's old or not. I believe you can google unlock codes or even purchase unlock codes off of Ebay.





