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Millions of smart meters will fail when 2G and 3G turns off
(www.theregister.com)
This is a most excellent place for technology news and articles.
There are many devices that use 2g for data, not just energy meters. ATMs, card payment terminals, alarms, gps trackers, all sorts of qpplications that don't need a lot of data and can benefit from the better coverage/range of 2g.