Any number beginning with 03 is classed as a non-geographic number. These are charged at standard geographic rates – i.e. the same as a call to a normal landline number, or a 01/02 number. This is the rule across all suppliers, and is written into telecoms legislation – therefore you should never be charged differently or more than a call to a normal landline. Telecommunications legislation means that these usually just come out of the inclusive minutes of a contract.