Iphone 4 network unlock code?

I have an Iphone 4 that i bought when i was with at&t i'm now on tmobile prepaid and i want to continue using it.at&t won't unlock it for me, anyone know where i can get the network unlock code so i can free up my iphone?

You can get an unlock code generator from this site: http://networkunlock.org/iphone4/ You just need to get your imei from your phone and put it there and it will get your unlock code

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