I have been trying to unlock/change carriers on my Verizon Iphone 4s. I tried using SAMpref but the app is for some reason not loading. Anyway, I used ifile to delete the files from the verizon, vodafone, and zepplin folders and replaced them with the at&t files. After not being sure if this was successful I replaced all the files. The problem is that the Iphone won't even connect to verizon anymore. (on the status bar it says no service and I can't even call the verizon 1-800 number) but under settings-> about> it says carrier: verizon. So basically, What do I do to get my phone to connect properly again? Please help!