Old iPhone 4S....
Weather apps, lunar game movement apps, property management apps that you can mark stand sights on arial maps, google earth, ballistic calculators, predator apps, just plug in a speaker or bluetooth to a speaker box. The list goes on!
Takes great pictures and I'm sure the newer phones take better ones, surf the web. Only complaint is I have to charge it every day if I use it a lot, I always carry a extra battery pack while hunting.