Telephone Number usage policy
03 numbers are formally known as "UK-wide numbers" and revenue share is not permitted on any 03 number range. The ten-digit 03 numbers are designed to cost no more than calling an 01 or 02 number and are usable within "inclusive" minutes when calling from mobile phones. This regulation also applies to landline as well as mobile providers. New users can choose between 030 and 033 numbers, but only certain bodies can use 030 numbers. Additionally, 034 and 037 numbers are available, but these are reserved solely for migration from the matching 084 and 087 ranges.