Calendar, sticky notes, both? How do you remember things?

How do you remember things? Do you keep a calendar? What kind?
I have more than a few, but they're all the kind I write on with pen and paper. One by my desk at work, one by my desk at home, one on the wall at home, plus one in my purse. I also use sticky notes by my desks at work and at home and in my purse.

What about you? How do you remember things? Do you use a typical calendar, or maybe one on your phone, or sticky notes, maybe both calendar and sticky notes?