Apologies if this has been addressed already (I haven't found anything yet.): I just ordered a 3G refurb online via AT&T Premier. It replaces an older non-iPhone on a family talk plan. Am I going to be able to activate this thing in the comfort of my home, or will I have to go to an AT&T store? If done at home, what is the basic process? (swapping SIM cards, iTunes activation, etc?) Thanks in advance!