Default [Q] Galaxy S4 At&t Unlock Help!!!

Hi,

I have a galaxy s4 at&t. I am trying to use the unlock method from where you type the number in the phone dialer and it brings the serivce menu but it won't work. http://gs4.wonderhowto.com/how-to/ca...-card-0148110/

I type in *#0011 and then after getting to input value and typing 1 it doesn't bring me to the screen where i can select the debug option.

Can someone please help asap! (I have also tried the *#27663368378# one)

Thanks in advance!