Now I am getting confused. Is the only thing that matters is my sim card? Can I just take this card and put it in another (compatible) phone and my number and everything is still the same?

Never really having been with Cingular (purchased ATT), I would think we are eligible for new phones (will be two years in November) if we sign another two year agreement. If so, maybe its smart to get this quad band your describing.

Again, thanks,