Itemised Billing is a summary of all your outgoing calls, listing the cost of each call rather than just the total cost of all calls made in the month.
Without Itemised Billing we will not be able to view your usage and will not be able to assist further with any queries that you might have regarding your usage billing.
The cost of itemised billing is £1.29 + VAT per month.  Most telecoms providers will charge a similar or higher amount.