Is it possible to change the code in Ifile?

I am trying to unlock my Iphone 4s but for some reason SAMpref is not loading on my iphone. Is it possible to go into Ifile and just change the coding from Verizon to AT&T like that? I'm far from an advanced coder but this seems logical, no?

It is very simple actually. Once you are in iFile, navigate to the file/text file and click on it. A menu will pop up with different options. One of the them should be text viewer; click on that. In the upper left hand corner of your phone there will be a button that says edit. Click on that then navigate to the code. You should be able to click on it and enter whatever you want. Once you are finished click save in the upper right corner of the screen and you should be good to go!