a device in hand

While sitting at the bar a few minutes ago, I noticed that half of us sitting at the bar were playing on our phones.  Doing what?  Texting somebody elsewhere why that person is sitting at the bar instead of at home?  Games?  Emailing (which is what I was doing!)? .. Playing a song on the jukebox app (That was me too! [in this case, Springsteen])?...