Maps published by Ofcom reveal large areas where Britons cannot access mobile networks for internet connectivity.
The maps, which provide a "snapshot" of 3G, or third generation, coverage of major mobile networks in the UK, show problems mostly in rural areas including large sections of Scotland, Wales, Northern Ireland, south-western England, northern England and East Anglia.
The graphics designed by Ofcom map the network coverage of Vodafone, Orange, O2, T-Mobile and 3 mobile networks.
The number of mobile internet device users is on the rise, with millions now connecting to the web through mobile phones, or their computer by plugging in USB modems or data cards.
Another finding published in Mostly Mobile, the second phase of Ofcom's mobile sector survey, said that landlines are being discarded in favour of mobiles.
While maintaining that mobile network coverage in Britain was relatively good, Ofcom said: "Indeed, it is better than in other comparable countries, but some issues persist.
"For 3G network coverage there is still a noticeable difference between rural and urban areas, and also between different parts of the UK, with coverage problems a particular issue in the devolved nations."
Technological issues, cost, planning restrictions, and topographical factors are responsible for differences in network coverage.
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