I'm older than most of you here. I'm constantly amazed at the lack of self control related to phones. I do exactly as you said, use my phone as a tool. Walking to work and think of something I don't want to forget? Whip out the phone and write myself an email. At home on a weekend and I'm in offline mode? DnD turned on until the alarm on my phone the next morning. I never feel like my phone is controlling my behavior or that I am a slave to it. Perhaps it's because I was able to grow up in a world without it. Dunno.