mwischmann wrote:
You would not be able to simply switch the SIM cards. You might be able to keep the same number though. You have to sign up for the special iPhone plan (with unlimited Internet).
That is true. First, GoPhone plans are different from iPhone plans. You must cancel the GoPhone plan and upgrade to the iPhone plan. Right now, I am uncertain if AT&T or whatever your provider still offers plans for a refurbished 1G or 2G iPhone, only because Apple has discontinued them. When and if you get that far, you must (and i mean must) sign up for the Unlimited Data plan, only because Apple requires it. You will have to pay extra for that, basically the luxury taxes of having an iPhone. And, in response to your post mwischmann, you will be able to keep your phone number, because they transfer that with the SIM card.