[billbudsocket]

If a girl does this to me I first make a playful-ish disapproving stare at her without saying anything (raised eyebrow, "are you kidding me?" look), and then if she keeps doing it, I say, "hey can I see your phone?" then when she hands it to me I slip her phone in my pocket with a big shit eating grin. Then I just keep her phone in my pocket for the next 15 min. or so, this is enough time to get the point across that texting in front of me is not acceptable. This almost always works, and if she does get pissed and demand the phone back I end the date early as it's not going to go anywhere anyway.