I can't speak for other carriers, but Verizon does work fairly well in Cherry Springs itself, but not too well on most of the routes in or out. I've heard people say they've had good luck with AT&T in the area.

If you may need something specific or hard to find in smaller stores plan to take it ahead of time, and double check your list. The closest Walmart is about an hour, you have a Dollar General, Sheetz, and IGA Supermarket in Coudersport (about 20 mins) and a small General Store for most of your needs. Also mind the deer and wildlife population, good odds of something running out in front of you at some point.