0333 numbers for all and any business.

0333 numbers are part of the 033 range and are available to any business or organisation.

0300 numbers for charaties, public sector bodies and non-profit organisations.

0300 for charity 0303 telephone numbers, part of the 030 range, have been allocated to public sector bodies and non-profit organisations such as charities. The Ofcom website gives guidance on who is eligible to use 0300 numbers.

0344 /0345 / 0370 /0371 numbers for business or number migration.

These numbers have been created for businesses and charities which at present have 0844 numbers, 0845 numbers, 0870 numbers or 0871 numbers and wish to have an 03 number. If, for example, you have a number starting with 0845, it will change to 0345. Similarly, if you have an 0870 prefix, it will change to 0370.