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<p>The not spot data was updated by Ofcom with information from the mobile network
operators. The operators submitted updated information on where they have coverage,
as predicted by desktop planning tools, in March 2014. Ofcom did not carry out on
the ground tests for all 34,000 not spots across the UK containing premises, as to
do so would be prohibitively expensive. In areas where coverage is thought to be marginal,
or there is uncertainty over coverage, DCMS officials have commissioned drive testing
to check the level of coverage.</p>
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