09-10-2009, 05:41 PM
Join Date: Aug 2004
Location: Somewhere in the swamps of Jersey
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You won't like the answer, but I don't believe you can make it work that way. A BlackBerry can only be registered (for e-mail and other data) with one carrier at a time. So right now your BB is registered on AT&T. And it works on AT&T.
When you put the Rogers SIM in, all you get is GSM (voice and SMS) and no data as the device is still registered to AT&T and not to Rogers.