Last time I visited Tokyo I bought a sleek little folding Bluetooth keyboard that fits in my pocket but unfolds to nearly full size and types very comfortably. By just unfolding it, it pairs with my Android phone and the on-screen keyboard disappears. Folding it up triggers the phone keyboard to reappear. I take it with me whenever I expect to write anything about as long as this comment.

Being generally a luddite when it comes to devices, I'm honestly shocked at how seamless the pairing process is.

I don't know why they don't sell these in North America.