Ok, I apologize if there is already a post on this, but I've searched and unable to find anything.

So I have the HTC one S that is obviously for Tmobile. I purchased an unlock version on Amazon. I popped in my ATT microsim card from my iphone.

I'm able to make telephone calls from the HTC one S, but do NOT have a data connection.

I called ATT and they were not much help, just said they don't support that particular phone.

Does anyone know how I get this HTC One S fully functional on ATT.

Thanks for your time and assistance.