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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
Personally I haven't used one, but any AT-command-based cellular modem should be pretty trivial to interface to.
Probably if you use a 4G module from SimCom (who make the SIM800/900) it'll 'just work' with the SIM800 Espruino module.