Samsung Blackjack II, E and G

I have read that the E in the upper-right hand corner of the status bar indicates that the cellphone is in the proper service area and signifies the edge service. My phone has been switched from E to G, but I just started noticing it. Does this mean that my internet or something is on that I do not know about? If it is just an indicator then I am fine with that, but if not I definitely need help. I would just assume that it is standing for Edge and GSM, but I want to make sure.

p.s. I did turn off the 3G capabilities to promote a healthy battery life, that is why I assume they stand for Edge and GSM. Any help would be appreciated. Thanks in advance.