BBM and the iphone question

Anybody with an iphone looked into what it will take to put BBM on the iphone? Daughter and son have iphones and I'm wondering how you get your BBM number for these phones. Might switch back to a blackberry since BBM doesn't look like it is heading to windows phones anytime soon. And it seems like if you can get one pin and then switch it to your new iphone as you upgrade that seems nicer then always changing your pin every time you upgrade your blackberry. #4407

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