Ask HN: What to do with old unused Android phone?

Hi,

I found 3 old android smartphones, still able to run. I was thinking what to do about it... after all, these are "small computers" that may be used!

I thought about some "clock" or "remote" or "musid player" apps... but maybe there's more creative use ?

What do you do with your old smartphones? Did you find some funny use ?