I was approved by at&t to unlock my iphone 4s but I accidentally clicked on RESTORE FROM BACK-UP, I didnt want to plug it out because I was afraid it would ruin the phone. Now I already switched carriers to T-Mobile and when I insert the SIM it states SIM not valid. Can I reverse the process, what do i do from here now ? Please help.
Try restoring your iPhone with the original SIM that came with your iPhone and you should get a prompt that your iPhone is not unlocked. If that does not work, then you will need to contact AT&T for further assistance with unlocking.