Still Tilting at Windmills

Their is a list but as well it's not just the phone model as well. The phones have some sort of firmware that sets the connections standards for the particular companies network. THey don't seem able ( more likely willing ) to reprogram this bit to a different comapany's settings. So in addition to the model the phone must have originated from AT&T. At least as it was explained to me by several different cell phone techs at a few different companies a while back.