Don't bother warning iPhone users who stand or sit near train doors that thieves can steal their phone. You've seen them, both male and female, between the ages of 20 and 45, constantly fondling their phones, standing in the doorway or near the doorway or sitting in seats adjacent to the door. I've only witnessed the guy, who unknown to me, who stole an iPhone wizzing by me then later the out of breath former owner of phone. So though I have not witnessed directly the stealing of iPhones, I've read enough and figured out as an iPhone owner, that the former owners probably weren't tossing their phones in the air or twirling them from the ends of their headphones the moment before they were stolen.
I was sitting on a yellow line train near the doors on a train with no wind guard (brrr), listening to my own iPhone, tucked away in a jacket pocket under an overcoat. Next to me on the seat was a young woman, in I guess her late 20s, bent over fiddling around with her iPhone looking at email, in the usual playing with my iPhone pose (elbows close to the body, 1 arm outscretched, the other with finger touching screen, head down, eyes focused on phone). I decide to be helpful and warn her there have been several thefts on iPhones from people near the door. She countered me by saying in a dismissive tone, "How can someone take it if I'm PHYSICALLY holding on to it." Not a question, a statement. I'm not going to argue, it was my stop, and I invested as much as I wanted into the dialogue.