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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.
ccchan
For that you would need something with much bigger battery and better antenna. Even your phone would struggle with that task https://en.m.wikipedia.org/wiki/Satellite_phone#Integration_into_conventional_mobile_phones
But maybe there could be deluxe version of the watch sold as a kit with two tinfoil hats, one small for the watch and one bigger :-)