If there's one thing I cannot stand when I'm with a girl I'm seeing, it's texting.
When I'm hanging out with a chick at my place or hers she'll take my phone sometimes to play a game on it, no big deal (I've actually realized I've had some very incriminating stuff on my phone at times but didn't worry because if some chick started going through stuff like that I'd flip). Even if a girl is texting it's not a big deal depending on what it is. Her girlfriend texts her about something, she'll answer, but will leave the phone once we start doing something (movie, food, sex, etc).
The aspect of texting that is so shady, is when she hides the phone. If she makes that big of an effort to ensure you can't see who she is texting or what she is saying to the person, it's a huge red flag. I've had it happen to me before, and I'll just act indifferent for the remainder of the night, and then go NC after I leave (which I try to do as soon as possible). If it's that necessary to hide, it's not good and she should be dropped as an interest, but not a plate.
