Ok I seen on a thread that u can change your data network buy dailing #*#*4636*#*#.This evo 4g is always on 3g network but never goes to edge.Can I put the phone on gsm only and not have to worry about 3g coming on. Im asking because 3g runs down your battery faster than edge. I put it on gsm only but the 3g symbol still showing that its receiveing 3g data. I know on the hd2 you can turn it of thus saving a lot of battery life.