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19th April 2016
02:46pm BST

It's an old form of mobile internet, pre-dating 3G phones, let alone 4G, but it still crops up whenever you find yourself in areas without 3G or 4G coverage.
At least E is not the worst thing you can see on the top left of your screen - that honour goes to the dreaded four-letter combination: GPRS (General Packet Radio Service, if you were wondering).
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