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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
Ok, it looks from https://buyhere22.com/components/sim800-gsm-3.pdf like you can do:
which will power down the SIM800 - then presumably you can pulse the Reset wire (which is on that breakout board) to reset it and start it back up again.
It's a bit more of a faff though.