If you're like me, picking up your phone is your go-to move when you're waiting in line, strolling down the street, sitting at a Starbucks . . . you get the picture. While it's a great tool for productivity (and killing time), it'll make you appear unapproachable. Take a break from the phone if you don't really need to be using it, make eye contact with the stroller-pusher walking down the street, and flash a friendly smile.