With all of the features many of us are clamoring for, is it possible for the iPhone to handle two phone lines to one phone? Meaning two separate phone numbers from AT&T coming into one iPhone? I realize that in it's current state it can't, but with a software upgrade is it possible or would this require a different configuration within the radio itself? I carry two phones (1 FLIP, 1 iPHONE 3G) with AT&T because I have two lines with different area codes and I thought it would be great to consolidate them into one phone. I have searched all over the net and Apple's site but don't really see anything about this.