I bought the 3g like 3 months ago. 2 nights ago when apple unveiled the 3gs i went on apple and preordered the 3gs. I chose to do a early upgrade. They asked for the number that the phone will be on. Now, when i receive the phone on the 19th, what do i do with my sim from my 3g? Will the 3gs already have service? Also, im gonna sell my 3g, do i take the sim out, and will the person buying it have any problems activating their service on it? Sorry for all the questions.