I have just started geocaching. I go on backpacking trips that last anywhere from 3-14 days. A cell phone would never make it past the first or second day, let alone the fact that there would be no cell service for most of that time.
I have just purchased a Dakota 20 which is why I started geocaching, one more thing to add to the adventure. When/if they ever make a cell phone that can take that I might try it out. I don't expect that to be soon.
Cell phones may be OK if you never leave the city by much. Me I get as far away from the city as I can as often as I can and I really don't want my cell phone to be on even if it does get a signal.