I use both a smartphone app and a computer (wired even!). I've never noticed the wires getting in the way of anything, but I'm not the most aggressive rider so take anything I say with a grain of salt. I usually just use the computer for distance and the time of day. I often have other engagements after riding, so I have a limited amount of time I can spend out there. I want to make sure my wife isn't upset when I get home.