Is the unlocked Samsung Galaxy S6 compatible with Straight Talk?

[AC Question]

I am looking at purchasing the unlocked Samsung Galaxy S6 G920F or the G920i and I think the G920i is an international phone but the ad mentions the G920i is compatible with StraightTalk but I I don't think I need or want an international phone... I just want the model that is compatible with straight talk. Can anyone answer this for me...thanks!