From what I've seen, the tiny Palm Phone (from TCL) didn't do very well, but there's still some inventory on Amazon: https://palm.com/pages/product.
There's also the Cyrcle Phone (https://www.cyrclephone.com/) which doesn't seem to be for sale anymore after its Kickstarter and Indie Go Go campaigns.
The Cyrcle Phone doesn't look small at all, just in a different shape. Also from the video shots it looked like the UI wasn't very well adapted to it's screen shape.
The battery is the main issue, about 2h of use or 1 day if in power saving mode with every optimization applied.
It's still good enough as a travel phone, turned on only when I need to call.