I recently had my iPhone 4 unlocked from AT&T. I am switching carriers and need to be able to edit the APN settings. However, I still don't have the option to see the Cellular Data Network settings even though my phone is unlocked. Why is this? Does anyone have any ideas? I can set some APN settings viea the iPhone configuration utility, but not all of the ones that are shown in the Cellular Data Network screen. Thanks for any thoughts.