As we have poor mobile reception at home, although it has improved a bit recently, when at home we use the land line. So I put my phone down. It could be in the car, my handbag, on my desk and when I go out I just take my bag and run.
It is not that I do not want to have it with me all the time but I forget to check - and I also forget to charge it, so find I have it with me, but unusable because it isn't charged. I have tried training myself to good habits, I am usually very good at that.
I think the problem is I have a love hate relationship with it. I am mildly dyspraxic and following a not entirely successful carpal tunnel operation the tips of my fingers are all numb. This makes both using those fiddly little touch keyboards and using a stylus equally difficult. I also hate that tiny screen. I just find that using a mobile phone plays to the worst part of all my problems with numbness and dyspraxia.
If I could find a kindle sized phone with a kindle sized screen, I would probably take it everywhere.