Phones are incredible, but they do too many things.
Pick it up for one thing, end up somewhere else entirely.
Try using a pocket notebook. Start here:
8 ways to use a pocket notebook INSTEAD of your phone:
1. Ideas page: One dedicated page, no risk of getting distracted by opening an app
2. Hand-drawn calendar: Write the month, number the days, done
3. To-do list: Write what you need to do in your notebook; no Reminders app needed
4. Memories: print a photo of the week, glue/tape it in
5. Entertainment: A poem or a list of quotes for those idle moments in your day
6. Recommendations: Someone suggests a book or movie, it goes straight into the notebook
7. Grocery list: Fully present in the store, no message temptations
8. General notes: Gift ideas, packing lists, anything you'd open Notes for
Choose where your attention goes.