Phones aren't PCs. They are crippled and locked-down devices. Of the ones that are capable of running a full Linux distro, I don't believe any are even close to the size of Noodle Pi.
I'm not aware of any Linux wristwatch or any other computer that's in production and available to buy that is smaller than Noodle Pi. If you know of a Linux wristwatch that's for sale commercially I'd love to know about it.
The only Linux wristwatches I see in a quick online search are two prototype devices, one made by Steve Mann and the other by IBM. Neither of those devices were actually usable as a PC, or available commercially. Mann's actually relied on a second hidden wearable computer to provide the actual processing power.
I'm not aware of any Linux wristwatch or any other computer that's in production and available to buy that is smaller than Noodle Pi. If you know of a Linux wristwatch that's for sale commercially I'd love to know about it.
The only Linux wristwatches I see in a quick online search are two prototype devices, one made by Steve Mann and the other by IBM. Neither of those devices were actually usable as a PC, or available commercially. Mann's actually relied on a second hidden wearable computer to provide the actual processing power.