Practical answer
How do I board a flight without my smartphone?
Print it, or use the kiosk. Every airline still supports paper — travel is more solvable than it feels.
Air travel feels like the hardest case and turns out to be one of the easiest.
- Check in online the day before and print the boarding pass at home.
- Use the airport kiosk or the check-in desk. Both still exist at every airline.
- Ask for a paper pass at the counter if the kiosk gives you trouble.
- For rental cars and hotels, a confirmation number written down is enough.
If you travel weekly
Frequent travel is a legitimate reason to carry a smartphone on travel days specifically. Many people keep the smartphone for trips and the simple phone for ordinary weeks. That is a setup, not a failure.