There's also an element of risk in hunting alone. I had a couple incidents. One was where I high centered my 4wd pickup trying to track down a young dog that went wandering. Had just enough juice in my cell phone to make an emergency call for a tow truck. Didn't find the dog, but he showed up a couple days later.

Potentially worse one was breaking a foot while pheasant hunting alone. Well, I wasn't entirely alone, but the Brittany and I were half a mile from the truck, and I couldn't convince her to go fetch the truck for me. Didn't have my cell phone with me that time. Managed to hobble back to the truck.
I always have the phone with me now, plus a charger in the truck to make sure it doesn't go dead on me. Simple stuff.