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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Hi! Yes, I think you could do something... I definitely remember seeing some GSM/etc breakout board that had headphone/mic jacks on it.
Even the phone modules are generally pretty easy to wire up so you could do a custom PCB with a Espruino MDBT42/MDBT50 and phone modules, and an Epaper or LCD slapped on it.
However it's quite a lot of work, and I'm not sure the end result would be much better than a Nokia candybar phone ;)