Unlock iPhone 5S AT&T with an unlock code?

Recently I bought an iPhone 5s 64gb from AT&T from eBay.
The seller gave me the unlock code that he was given by the AT&T wireless department.
Now, my question is, how can I unlock this phone to use it with my T-Mobile SIM card?
Having the unlock code I still must give 160 bucks to an unlocker website to do it for me?
Should I contact the AT&T service or what?

If the phone was paid off then you should call ATT with the code and they can help you, tho the seller should have done that already and the phone should be good to go on Tmobile. To check, you could go to Tmobile and they can see if the phone is unlocked.

Hi, I'm currently selling unlocked iPhones if you are interested. What was the price you purchased it for on eBay? Feel free to text me at 910.333.4375 or email me at nationofapple@gmail.com.

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