I'm glad everything worked out for the OP, but I got a good laugh at what would have happened if it was me in his shoes. I don't carry my cell-phone, it's usually in the truck and the battery is usually dead.
Girl: "What! I'm scared and need your phone!"
Me: "You really don't want my phone."
Girl: "Please, I'll take anything."
Me: "OK, here ya go."
Girl (later): "What! A dead tracphone with 20 minutes on it!!"
Girl: "What! I'm scared and need your phone!"
Me: "You really don't want my phone."
Girl: "Please, I'll take anything."
Me: "OK, here ya go."
Girl (later): "What! A dead tracphone with 20 minutes on it!!"