I have the SGH-I272R model phone and am getting the error message "not registered on network" whenever I try to input the unlock code I got from cellunlocker.net. I tried calling the tech line and the system said " no one is available to take you call" click. End of that.
I have tried all the different ways to enter the unlock code. The strange part is that I am NOT getting any prompts to enter an unlock code at all. And it should. It is not unlocked.
Any help would be greatly appreciated.