One of the best purchases I have made for ice fishing, open water fishing, and marsh hunting is this I-phone holder. I decided to post this after watching a video where Jay Sieman's buddy drops his phone down the hole after nearly losing it minutes before.
Putting my phone in this case and hanging it around my neck means I can text and fish simultaneously, have a camera at the ready for those bragging shots of 8 inch jumbos, and continue trying to entice a mark to bite while explaining to my wife why I'm going to be "just a bit longer".
The holder is very secure and it takes all the worry out when using over an aquatic environment. Having the phone tucked warmly inside one's clothing while deer hunting on a stand also helps preserve battery life. This is one of those pieces of gear that I will actually turn around and go home for if I realize it's been forgotten.