I think this topic has been covered before but I couldn't find it.
What do the guys here do to prevent your cell phone from being stolen? (I know pickpocketing is rare but it is possible.) I don't always carry a day bag.
Currently, I have a ring on the back of my phone that is used to hold the phone and seconds as a stand. I've been using a two sided clip: one side on the phone ring, the other on a belt loop.
A couple of notes:
1) If you don't bring one and need to share that, it doesn't really help me.
2) If you carry it in your purse, it doesn't really help me.