I'm with the poster who would be concerned who is listening both on the lime and anyone following me, where I am, my name, how far away from home I am ( in other words how long s/he has to kill me befire I get home).
I also wouldn't be holding up a phone as I walked. That's in a pocket in.my.back pack I put up my hood to hide my head phones, talking would advertise the fact that I had a phone and headphones to nick.
Honestly I wouldn't wanna put these volunteers who ,however misguided some aspects of the idea are, clearly care about the callers , in the position of hearing me attached and powerless to do anything about it. Who do three poor buggers phone when they are scared and traumatised after a heavy call.
Again why is it on me to call amd men not to stalk me?.