Samsung Galaxy S7 Edge mobile phone is submersed in water during a preview of Samsung's flagship store, Samsung 837, in New York
A Samsung phone that is advertised as being "water resistant" actually isn't, accoring to Consumer Reports.
The problem appears limited to the Galaxy S7 Active, a rugged model available only through AT in the US.
The standard S7 and S7 Edge models have the same claims on water resistance and passed tests.
Consumer Reports, a non-profit organisation that is well respected for its product testing, has said that it cannot recommend the Active because it does not meet Samsung's own claims.
By contrast, Consumer Reports rates the S7 and S7 Edge phones as "Excellent" for their displays, battery life and cameras.