How to complete unlocking an Iphone via itunes?

So I bought an iPhone, and got it unlocked with AT&T and Apple and now they are telling me to complete The unlock via iTunes I was never given instructions, so now I need help. My carrier is T-Mobile and whenever I insert the Sim card it tells me there's no service also it say insert a sim with no pin lock do you know what that means?

Did you buy the phone overseas? My dad had that problem and had to get it unlocked at the store…
But if not itunes is pretty simple just open your phone {unlock it if you have a passcode on it} and connect it to your computer with itunes installed and follow instructions that should pop up

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