I am currently on the last 9 months of my AT&T plan and have the chance to get a 3gs for $100 so I wanted to take advantage of this and just use it. If I pop in my sim card from my phone will it work right off the bat? Also, I have heard that AT&T will begin charging me for the 3g service whether I ask for it or not, what is the cheapest option for me if I want to use mostly wifi (which is abundant here at work, home and hotspots throughout Long Island which are all free) I guess I just want to know what is the cheapest way to use this phone on a current ATT plan? FYI - the iPhone is activated already and I don't want to extend my ATT contract Please Register or Log in to view images ------------------double post merged------------------Also aside from the USB cable what else should I make sure about the phone? Does it need a SIM in it already?