<P> Since 28 April 2001 , almost all geographic numbers and most non-geographic numbers have 9 or 10 national ( significant ) numbers after the `` 0 '' trunk code . All mobile telephone numbers have 10 national ( significant ) numbers after the `` 0 '' trunk code . The overall structure of the UK 's National Numbering Plan is : </P>
what do mobile numbers start with in the uk
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