Title says it all. I’ve let my phone sit for 4 min untouched in flight, and it’s pretty hot. I did not notice any small pink indication of lower power mode being turned off once I touched the screen again.
Yes I did check the settings and low power mode is selected
If the option is checked you should see a brief message at the top of the screen when it enables. You may need to let it sit for longer depending as any touching or moving will sometimes set it.
Hot is a relative term but devices do get warm. They are designed to but some cases make the problem worse by trapping the heat. Lower your brightness or graphics and that should help too.