Quick question. As my D1 is my first smartphone, I am unclear on the policy/process of having two phones with only one paid phone line. I am guessing when the dual cores arrive, I am probably gonna upgrade to a new phone and keep my D1 as a spare. I do not need/want to have both active (I am sure this is impossible) but I am unclear as to whether I can just purchase the new phone and "deactivate" my old phone myself. Does this have to happen at a store, or is this something I can accomplish myself, either on-line or on phone?