(Updated) What UK Network do you use and Why?

So basically I was wondering why you use the mobile network you do; whether it be for coverage, unlimited Internet or bonuses (like orange/EE Wednesdays).

Also how much do you pay for what you get and have you changed recently and why?

(Update) I have just joined three with a £12.90 sim with unlimited internet in my N4, All ready reaping the rewards

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via www.speedtest.net