Sounds impossible right? Maybe not. Here's how I know that. I have a jailbroken iPhone 4S (Verizon model) and have been playing with it ever since the jailbreak for it was released. I decided one day to replace all the files in 310VZW folder in carrier bundles with the files in the ATT_US folder. What happens when you do that? Well interesting thing actually. The "Carrier" tab appears in the settings menu and both T-mobile and AT&T appear as a selection. When you check T-mobile the well known "E" or Edge appears at the top and AT&T has "3G" appear, of course. There is also the automatic selection if you want it to load a network automatically. Now here's the catch. Visual Voicemail no longer works as Visual Voicemail coding is inside the file "carrier.plist." Along with that, it is only temporary meaning that the connection to the network does not last and the "No Service" announcement appears in the top left corner leaving you without any service at all. I think, in all honesty, us CDMA customers got short handed when this phone was released as AT&T customers get 3G+ while us CDMA users only get what they call "3G" which is so slow for us. So I thought, "Hey maybe someone can come up with a better idea on how to get the CDMA iPhone's to roam on AT&T?" Well does anyone have a good idea on how to do that because obviously it's not impossible. It just needs work.
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