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Looks like cool idea, but I would bet about simple GSM instead of 3G or LTE. There are a lot of countries already without 2G support. Thing is that it is too expensive for cell operator to maintain both new generation and old-generation equipment. USB 3G modules are pretty cheap (~10$), and it is very easy to make them work with Edison, e.g. with this guide: http://bovs.org/post/168/Building-Yocto-linux-for-Intel-Edison-with-3G-USB-modems-support
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