For the past few weeks, every Saturday, I’ve been doing something crazy. I’ve turned my phone off for the entire day. At first it was really hard. I would reach for that little rectangle instinctively. I’d tap my pockets for no reason. And then I felt phantom vibrations—you know the ones you feel when you think your phone is going off even though it’s not even next to you. These are all signs of an addiction, and I’m not alone.…