It works.
"Does what it needs to do. Bit hard to get your phone in and out because the opening is quite stiff. But the overall quality is good. But you can still operate the phone when inside. To be honest, when open water swimming with a buoy I don't use it. The inside of the buoy stays dry (enough) anyway. It is still handy with other water activities. I have a small phone don't know if those current big phones will fit. . ."