Here in Western Pa, some fishing spots are down inside a valley. DOWN..... inside a valley! Ya gotta look up in all directions to see sky. Ain't no cell reception.
Nice to have a means of telling someone that the fishing is too good to leave right away. Even if it's necessary to hike to a spot with reception. I hope that's all you ever would need it for.
How do you use a Ziplock for a phone that opens up like a clam, in time to answer if it rings? Now you have to picture this, me, in the water up to my..., the current working against me, the nice round rocks on the bottom slicker than snot, concentrating on the job at hand, and the cell goes off. Usually scares the heck outta me! Gotta fumble thru the pocket thats buttoned shut, cause clips can't be depended on, and don't work thru a plastic bag anyway. Then, gotta open the Ziplock to open the phone. Don't drop the phone, or the rod, or the Ziplock! Hurry and answer before the thing quits, cause you don't always know who called, and maybe the reception is bad and you won't know who called, and you have to hike somewhere to find out who called! Don't drop the %^&* thing into the river, the current is really fast today and it's 200 feet wide! It'll sink like a rock and get washed down stream and ......!!!!!
I think this whole thing needs some thought. Woodbutcher