There are just so many things that make a smart phone just indispensable for me. Not long ago I was working on a project, and I needed a small Allen wrench. I dug through my collection, and found one that fit. I wanted to figure out what size it was. That is some sort of little tiny text there. Even with my bifocals and good lighting I could not make it out.
Whip of the cell phone, snap, oh it is a .050 inch. Dang small. I then knew what it took to remove the part, and I filed that in the noes I made on the repair. All stored on my phone.
I have numerous notes on my phone. Like how to program the Liftmaster version of Homelink to the rear view mirror in my car. Lots of non intuitive steps, and I only have to do it once every few years.