Calls to this number cost the same as a call to a standard "01" or "02" landline number, even when calling from a mobile. Calls to this number are also included in any bundled minutes or free talk time that covers landline calls. Where calls are made outside of a bundle you will be charged at the national rate. Calls may be recorded for training purposes.
The actual cost you are charged will depend on your phone provider, please check with them if you are unsure.