SM-G891A might be Samsung Galaxy S7 Active
Samsung cannot spend a year without introducing small, big or active version of its flagship phones.
Just a couple of days ago, Samsung shipped a phone named SM-G891A to AT&T. According to the rumors, it may be Samsung Galaxy S7 Active. Moreover, its codename is “Poseidon”. Right now, there is no information about its hardware, but probably it will have the same specs with S7 but will be more resistant to water or dust.
( the phone in the featured photo is Samsung Galaxy S6 Active )
That SM-G891A in testing at AT&T is known as the Samsung Poseidon.
— Evan Blass (@evleaks) March 25, 2016