Which Samsung Galaxy S5 model(s) will work with Straight Talk?

[AC Question]

I'm looking to buy an unlocked Galaxy S5 on ebay, but I'm not sure which models will work with the Straight Talk AT&T sim card and will also have LTE. A list of models that would work would be greatly appreciated. I'd hate to spend that kind of money on a new phone and have it not work.

 

[Beerbon]

For it to work with the AT&T sim card it would have to be an AT&T model...

Someone correct me if I'm wrong.

P.S. I have an AT&T model, not unlocked, running on Straight Talk with LTE