Ok first I am a noob when it comes to this stuff so forgive me. Recently I was given an at&t S3 SGH-I747 for free. It has Jelly bean 4.3. I started off by trying to unlock the SIM so I could use my T-mobile card following several methods I found online...nothing worked. I then proceded to root the phone which of course Knox killed that effort...until yesterday. The phone updated SuperSu yesterday and allowed me to disable Knox so now its rooted. Now my question is there a way to unlock the SIM now that its rooted?