I still use paper maps. My phone, an ancient Juke that is tiny and decidedly stupid, stays off until I need to use it(generally to call the wife to let her know I finished my ride and did not die).

Cycling is my escape from phones, computers, technology, stress, etc. When I come to an intersection, I often pick the more interesting way to go. If I had a phone telling me I should have gone straight when I decided to go left, I'd probably chuck the thing in the ditch.