On the road, I generally wear mine on my hip, which has worked OK for accessibility. I learned not to do so on the trail, after I took a fall to the side and ended up with an iPhone with a noticeable curve in the body (fortunately it still worked and the screen didn't shatter). I have used handlebar mounts with some success, most notably on larger events where the backup phone goes on the bars and runs the tracking and music, and the primary phone is on my body for communication and note-taking.