Texting while Hanging out

The other day I was at lunch with an old friend I hadn't seen in a while and while I attempted to enage in conversation I noticed the entire time she was on her phone. This bothered me a little bit since I was trying so hard to talk with her. I think this is the case with a lot of teenagers and in my opinion when you are spending time with friends, text the person on the other end of your phone and tell them you will reply in a few hours, you are with friends. A good, understanding person would accept that and give you that time. It hurt me a lot that whenever I told a story the only response was "what?"