Hello, I am a canadian user of the iPhone 3g, with a contract with Fido. I am looking into purchasing a BlackBerry 8900 but I don't know if the iPhone sim card would work. Previously, before owning the 3G, I owned a regular Sony Ericsson phone (not unlocked); but same service provider, and the 3G sim card did not work with my old phone. That is why i'm questioning. Do I have to unlock the BlackBerry for my 3G Sim card to work? & If it does work, if I use internet on the 8900, would that be part of my 3G unlimited data?