This is what the 'E' in the top corner of your phone stands for

We all know the meaning of 3G, 4G and that little Wi-Fi symbol, but what of the mysterious 'E'?

Aside from 'I'm not going to be able to load this 5-minute video any time soon', it has been a matter of concern* for us all.

Well, the answer is: Edge.

Well technically it's EDGE, standing for 'Enhanced Data Rates for GSM Evolution', not Edge, standing for David Howell Evans (we don't know either)

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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).

*We suspect no one really cares