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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.
@IanWatkins
http://www.carphonewarehouse.com/sims/pay-as-you-go/pay-as-you-go-sims most come with call minutes and texts as well but fairly cheap.
GiffGaff do SIM deals with data only and can be topped up or contract starting at £5 for 500mb.