3g possible with original supersim?

i still use my original supersim from the very first unlock. i remember it was a long involved process that not only included the building a brand new sim but programming as well. i'm probably wrong but wasn't the original supersim a kind of combination of both my original (i'd been on t-mobile for 5 years) t-mobile sim and info from the inactivated att sim and my t-mobile? i only ask because my t-mobile 3g phone always has 3g showing where the web bars usually go. it does seem faster than it was on edge but i'm probably just imagining it...?

i meant to say that the 3g logo comes up instead of the "E"