Be prepared for your hike. No service, dying battery: two problems you won't face with a map handy.
Phones aren't always reliable for directions when on a hike. Be smart. Stay on marked trails.
Bring a Map
The Warden Service is responsible for finding you in case you become lost in the woods. The State Police are in radio contact with wardens, so those concerned should call 911 and they will notify the Warden Service.