The mobile phone giant EverythingEverywhere, owner of T-Mobile and Orange, has reported a jump in the number of more profitable contract customers by 151,000 in the first three months of the year.
But revenues slipped 2.5 per cent to £1.5bn as regulators pushed down the cost of calls.
Olaf Swantee, the chief executive, is keen to launch a next-generation 4G service early, but denied he wants Ofcom to let him have a "head start" on rivals.
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