I'm probably not the first guy to think of this but I thought it might be helpful for anyone who hasn't heard it. I'll call it the kindle opener.
So I was sitting at the pool one day and a nice looking girl was sitting near me and reading her tablet. So partially out of curiosity and also cause she was attractive I asked her how she was able to read in the bright sunlight and she showed her kindle and we had a conversation. Since then I tried it on 2 other girls that were fooling with there cell phones and opened them successfully too. This is particularly good for pools but it could work anytime you're outside during the day and a girl is playing with a cell phone or tablet.
Obviously you don't want to stay on this opener too long cause most girls don't like talking tech but it does break the ice and doesn't make it obvious you're hitting on her.