VODAFONE UK will increase investment in its network by up to 50 per cent this year as it prepares for the launch of ultra-fast 4G services by the late summer.
The firm said its spending is set to rise to more than £900m in the current financial year, up from £600m last year.
Vodafone said it would use the extra cash to integrate its fixed and mobile network, following the £1bn buyout of Cable & Wireless last year.
The company has already invested heavily in frequencies to support 4G services, having spent £802m on available spectrum at the recent Ofcom auction.
It has pledged to deliver indoor coverage to 98 per cent of the UK population by 2015.
Vodafone UK chief executive Guy Laurence said: “This investment is great news for customers and further evidence of our commitment to deliver our best ever network. We’re bringing together the best of mobile and fixed communications to help our business customers make their communications work for them.”