This is a very nice service which can be useful for making free conference rooms depending upon the needs of an individual/business.
The number of participants is currently limited to six callers at a time. Access numbers charged at the normal landline rate.
More details available at below website.
http://www.conferencebuster.co.uk/Also Call 0800, 0808 & 0500 Numbers Free From Your Mobile. Just dial 0333 555 8800, enter the full free-phone number you want to call at the prompt, then press #.
Full details are available at
http://www.0800buster.co.uk/