O2 ups revs and punters: "The UK-based cellco's total number of customers stood at 25.7m - up 17 per cent compared to last year - thanks in part to a 34 per cent jump in numbers in Germany. But customer numbers were also buoyed by O2's ability to hold onto existing punters and stop them from switching cellcos."

Not only this. O2s customer base has a predisposition towards using mobile data unrivalled by other operators.