[aestra]

I turn my phone off in unfamiliar cities to save battery for GPS.

I turn my phone off at movie theaters and airplanes.

I rarely keep bluetooth on to save battery (I don't really use it save for once in a while) and I also quite often turn mobile data off unless I take my phone out to use it.

Sometimes it runs out of battery.

Quite often I keep my phone in a different room of my house than I am in, especially when it is charging.

Sometimes your phone breaks or malfunctions (hopefully not often).

Sometimes I just plain forget it.