I just got a HTC Inspire that I'd like to setup on T-Mobile with the cheapest plan possible. I don't need data because the phone will always be on wifi. I'm wondering if I can just buy a new sim or if I have to buy a feature phone & sim to activate and then move the sim to the Inspire. Also is it better to root & push a non-default rom or should it work with the default AT&T gingerbread rom?