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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
That one looks good - mine was a very cheap Chinese one off eBay. The simple way to check is to put a SIM card in, plug it into power, and then see if after a while the light goes from blinking every 0.8s to blinking every 3 sec. Mine never did :)