Bought an "Unlocked" iPhone, when in reality it is at&t only

[randomkidzgaming]

On ebay i had bought an unlocked iPhone 6. When I got it, I tried to put the sim card in. It said sim not supported. I have purchased 3 unlocking tools already. None of them worked. I can't use the phone at all because I can't activate it. Is there any way of getting past the sim activation or am I screwed?

 

[rgd1101]

if it lock by at&t, contact at&t. or return it.

 

[randomkidzgaming]

if it lock by at&t, contact at&t. or return it.

When i try to unlock it by at&t it says that it is not an at&t device. That confuses me because every source says that this is an at&t phone

 

[rgd1101]

How did you know it is at&t? what sim care are you using?

 

[randomkidzgaming]

How did you know it is at&t? what sim care are you using?

I forget exactly which one i used, but i used some imei checker to figure out which network it was locked to.
I am using a tracfone sim, which is under t-mobile.