this thread is for N7000 not i717, i think people were talking about unlocking the international version not i717 one,
maybe your carreer disabled this function, try searching on the i717 forums and use the Q&A section, they will surely help you
by the way, if you bought your phone with a contract, there is a chance of 99.9%, maybe even 100% that it will be locked , try swaping sim cards and see if they would work
hope i helped .
Well My carreer disabled the function but flashing did the trick
Sent from my GT-N7000 using xda premium