If you don't have call display your phone (cell phone, home phone, blackberry phone) will not know what phone number a call is coming from.
Because it doesn't know what phone number call is coming from, blackberry can't match anything to your address book.
Part of the phone functionality is to take phone number it is told by Rogers call is coming from and match it to address book. Without call display service Rogers won't be telling your blackberry anything.
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