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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.
@LawrenceG
Part of the cost issue is carrier approval for the modem/device. In the EU telcos require GCF approval http://www.globalcertificationforum.org/ of at least the modem and increasingly the device (Dash/Electron etc.) before it's approved.
With high street PAYG SIMS you don't get any SIM management tools as you do with M2M sims. My M2M provider charges £3.30 a month for 1Mb for a Global SIM. Also most M2M providers don't like talking to me as I'm a one-man-band not some "big corp". For me Konekt/Electron are like citizen band for the IoT.