What I usually do is I put my phone on do not disturb so if I need to I can still call for help without being distracted on my walk.
Ga L W.
You can still take a phone for safety just keep it in a pocket and put it on silent so you don’t have interruptions. It will help build your self control in not using your phone in other areas of your life too.
When I go for walk I put my phone in "flight" mode, so that I can take pictures of I want, but I will not be' disturbed. Just try!