I have a helmet mount so if something happens anywhere riding I have some light...
I got some fishing trace wound on the dérailleur recently which was a real PITA removing. I never carry a phone riding, or not often.
Edit:
I just bought another 14500 flashlight too, an Sofirn SP10 v2 which fits in my pocket.
Edited on 2/6/2019 at 3:26 AM. Reason: