Well in my experience as a cyclist, I'm sure you see a lot of them as most drivers are focused on their phones, their radios, the scenery -- anything but the road.
Oh! Yes! I see at least one cyclist every morning fiddling with their phone. And tonight I saw two (in Norwich) tapping away on their phones two handed , dark hoodies, and without lights on a road approaching a hairpin S bend. That said they were teenagers so I guess they figured the glow from their phones were enough ;)