I like to keep my logistics to a minimum. That means not having to be concerned with recharging devices, making sure I have connections, and all that. Just give me a map and I'm good. I have recently started carrying a cell phone on tour, but I keep it turned off most of the time and mainly have it just for emergencies. However, I will power up at the end of the day to text my wife and email photos to friends if I'm someplace where I can tap into the wifi. I did try to use it for navigation on a recent tour through Poland, but gave up when it kept trying to tell me to turn right when there was absolutely nothing there to turn right onto. My paper map of Poland took me right where I needed to be, and even provided a few additional options.

One of my primary touring partners loves every gadget that comes down the line. We just returned from a tour through several European countries. Below is a true experience, one example of many similar:
(As we approach a T-intersection while following a EuroVelo route
Him: Let's stop and check which way we turn.
Me: We turn left here.
Him: Let's seeeeee (pulls out cell phone and powers up)
Me: We turn left here.
Him: (couple of minutes jiggling with the buttons on his phone) Okay, I've got a connection.
Me: We turn left here. (Me pointing over his right shoulder) Right there is a sign pointing left as the way to the town where we're going.
Him: I've got the map up. We are here (points to map on his phone.)
Me: We turn left here. Look over there. (Me pointing to a sign to our left) There's the Eurovelo route sign to our left.
Him: Ooookay.....it's showing the town we want over here, looks like to our left.
Me: That's because we are supposed to turn left here....you know, like the signs say.
Him: We need to go that way (he points left).
Me: Good call.